Health & Fitness calculators
BMI, body fat, calories and evidence-based health screening tools.
344 published calculatorsCardiovascular System 37
6-Minute Walk Test Calculator Calculate your predicted 6-minute walk distance and see how your result compares to normal values. Includes age, sex, and weight-based reference equations.
Open ABI Calculator (Ankle-Brachial Index) Calculate your ABI (Ankle-Brachial Index) for both legs. Enter arm and ankle pressures to screen for peripheral artery disease with clinical interpretation.
Open Aortic Valve Area Calculator Calculate aortic valve area using the Continuity Equation, Gorlin Formula, or Hakki Equation. Severity grading, step-by-step math, and clinical reference table included.
Open Arterial Age Calculator Convert your Agatston calcium score to arterial age using the MESA formula. Compare vascular age to real age and get a plain-English cardiovascular risk interpretation.
Open Blood Pressure Calculator Classify your blood pressure by ACC/AHA 2017 or ESC/ESH 2018 guidelines, average up to two readings, and get your mean arterial pressure (MAP) and pulse pressure.
Open Cardiac Index Calculator Calculate cardiac index from cardiac output and BSA, or stroke volume and heart rate. Covers Haycock BSA formula, clinical normal ranges, and a full worked breakdown.
Open Cardiac Output Calculator Find cardiac output from heart rate and stroke volume, the Fick method, or reverse solve for HR or SV. Also get cardiac index, stroke volume index, ejection fraction.
Open CHA2DS2-VASc Score Calculator Calculate the CHA2DS2-VASc score for atrial fibrillation stroke risk. Instantly see your annual stroke risk percentage and anticoagulation recommendation.
Open DAPT Score Calculator Calculate the DAPT score to guide dual antiplatelet therapy duration after PCI. Enter 9 clinical factors and see whether prolonged DAPT or aspirin alone is favored.
Open Doppler Echo Cardiac Output Calculator Calculate cardiac output, cardiac index, stroke volume and LVOT area from your Doppler echo measurements. Instant results with normal ranges and step-by-step math.
Open Duke Treadmill Score Calculator Calculate your Duke Treadmill Score from exercise duration, ST deviation and angina index. Instant risk stratification with 5-year survival and annual mortality.
Open ECG Boxes to Seconds Calculator Convert ECG grid boxes to seconds or milliseconds instantly. Supports small and large boxes at 25 mm/s or 50 mm/s, with normal ECG interval reference table.
Open ECG Heart Rate Calculator Calculate heart rate from an ECG using the RR interval, 300-rule, 1500-rule, 6-second method, or cycle length. Instant bpm result with a full worked example.
Open EROA Mitral Regurgitation Calculator (PISA Method) Calculate EROA, regurgitant volume, and MR severity with the PISA method. Covers primary and secondary MR with ACC/AHA grading thresholds. Free, instant results.
Open Framingham Risk Calculator Estimate 10-year cardiovascular risk with the Framingham score, plus your heart age, a risk-factor breakdown, and a what-if showing how much risk you can remove.
Open Gorlin Formula Calculator: Aortic and Mitral Valve Area Calculate aortic or mitral valve area from catheterization data using the Gorlin formula. Includes stenosis grading, Hakki approximation, and step-by-step math.
Open GRACE Score Calculator Calculate the GRACE score for acute coronary syndrome. Get in-hospital and 6-month mortality risk categories for NSTEMI and STEMI from 8 validated clinical variables.
Open Gupta Perioperative Risk Calculator (MICA) Calculate perioperative MICA risk with the Gupta model. Enter age, ASA class, functional status, creatinine, and surgery type to get your 30-day cardiac risk.
Open HAS-BLED Calculator Calculate the HAS-BLED score to estimate 1-year major-bleeding risk in atrial fibrillation patients on anticoagulation. Instant result with risk category and interpretation.
Open Heart Failure Life Expectancy Calculator Estimate 1-year and 3-year heart failure survival with the validated MAGGIC risk score. Enter age, ejection fraction, NYHA class, kidney function, and comorbidities.
Open HEART Score Calculator Calculate the HEART Score for chest pain risk stratification. Get your low, intermediate, or high MACE risk category with clinical guidance for ED triage.
Open ICH Volume Calculator (ABC/2 Method) Calculate intracerebral hemorrhage volume using the ABC/2 or ABC/3 formula from CT measurements. Includes severity classification and mortality thresholds.
Open LV Calculator - Left Ventricular Mass Index Calculate left ventricular mass, LVMI, and relative wall thickness from echo dimensions. Classifies LV geometry: normal, concentric remodeling, or LV hypertrophy.
Open MAP Calculator (Mean Arterial Pressure) Calculate mean arterial pressure (MAP) from systolic and diastolic blood pressure. Instant result with pulse pressure, clinical ranges, and a show-your-work panel.
Open Mitral Valve Area Calculator Calculate mitral valve area using pressure half-time, deceleration time, Gorlin formula, or continuity equation. Instant ACC/AHA severity grading for mitral stenosis.
Open Padua Score Calculator Calculate the Padua Prediction Score for VTE risk in hospitalized medical patients. Get risk category, thromboprophylaxis recommendation, and full scoring breakdown.
Open PERC Calculator - Pulmonary Embolism Rule-Out Criteria Apply the 8-item PERC rule to safely exclude pulmonary embolism in low-risk patients. Instant score, interpretation, next-step guidance, and clinical evidence.
Open PISA Calculator (Proximal Isovelocity Surface Area) Calculate EROA, regurgitant volume, and mitral valve area with the PISA method. Instant echocardiographic mitral regurgitation severity grading per ASE guidelines.
Open PVR Calculator: Pulmonary Vascular Resistance Calculate pulmonary vascular resistance in Wood units and dynes/sec/cm5 from MPAP, PCWP, and cardiac output. Normal ranges and severity classification shown.
Open QTc Calculator Calculate the corrected QT interval with five formulas (Bazett, Fridericia, Framingham, Hodges, Rautaharju) from QT and heart rate or RR, with a sex-specific reading.
Open Rate Pressure Product Calculator: RPP and Myocardial Workload Calculate the rate pressure product (RPP) from heart rate and systolic blood pressure. Get your myocardial workload category and clinical interpretation instantly.
Open RCRI Calculator - Revised Cardiac Risk Index Calculate the Revised Cardiac Risk Index (RCRI) to estimate major cardiac event risk before noncardiac surgery. Based on Lee et al. 1999 with 6 clinical risk factors.
Open Revised Geneva Score Calculator for Pulmonary Embolism Calculate the Revised Geneva Score for pulmonary embolism pretest probability. Stratifies PE risk into low, intermediate, or high with clinical guidance.
Open Stroke Volume Calculator Calculate stroke volume from EDV and ESV, cardiac output and heart rate, or Doppler LVOT echo, plus ejection fraction, cardiac output, and cardiac index.
Open TIMI Score Calculator for UA/NSTEMI Calculate the TIMI Risk Score for unstable angina and NSTEMI. Enter 7 clinical criteria to estimate 14-day risk of death, MI, or urgent revascularization.
Open TIMI Score for STEMI Calculator Calculate the TIMI Risk Score for STEMI to estimate 30-day all-cause mortality. Enter 9 bedside clinical variables and get instant risk stratification.
Open Wells Score Calculator for Pulmonary Embolism Calculate the Wells Score for pulmonary embolism pre-test probability. Get 3-level and 2-level risk classification with D-dimer and CTPA guidance.
Open
Gynecology Pregnancy 35
BBT Calculator - Basal Body Temperature & Ovulation Adjust your BBT for wake-time offset, calculate the FAM coverline from pre-ovulation readings, detect a thermal shift, and identify your fertile window.
Open Birth Control Effectiveness Calculator Compare contraceptive effectiveness (typical vs. perfect use), pregnancy risk over any timeframe, Pearl Index, and annual cost for 16+ methods side by side.
Open Bishop Score Calculator Calculate the Bishop score for labor induction readiness. Enter all five cervical exam findings for an instant score with interpretation and clinical guidance.
Open Breast Cancer Recurrence Risk Calculator (NPI) Calculate your Nottingham Prognostic Index (NPI) score for breast cancer prognosis. Get your 5-year and 10-year survival estimates and risk group instantly.
Open Breast Cancer Risk Calculator (Gail Model) Estimate your 5-year and lifetime breast cancer risk using the NCI Gail Model. Enter age, family history, biopsy results, and more. Instant, evidence-based results.
Open Breast Pump Flange Size Calculator Enter your nipple diameter to get your recommended breast pump flange size in seconds. Includes a brand size chart, fit tips, and signs of a wrong-size flange.
Open Breastfeeding Calorie Calculator Calculate how many calories you need while breastfeeding. Adjusts for your age, weight, height, activity level, lactation phase, and weight goal. Free and instant.
Open Chances of Having Twins Calculator Estimate your probability of conceiving twins using age, fertility treatment, family history, BMI, height, and ancestry. See fraternal vs. identical odds instantly.
Open Clomid Ovulation Calculator Find your ovulation date, peak fertility window, implantation window, and best days to conceive after Clomid or Letrozole. Free, instant, research-backed.
Open Conception Calculator Estimate your conception date from your last period, due date, ultrasound, or IVF transfer, with a conception window, fertile days, and how far along you are now.
Open Crown-Rump Length (CRL) Calculator Calculate gestational age from ultrasound CRL measurement, or find expected CRL for any week. Includes due date estimate, normal CRL ranges and worked formula.
Open Due Date Calculator Estimate your pregnancy due date from your last period, conception date, IVF transfer or ultrasound. See how many weeks along you are, your trimester and milestones.
Open EDD Calculator: Estimated Date of Delivery Calculate your Estimated Date of Delivery (EDD) from LMP, ultrasound, IVF transfer, or conception date. See trimester dates, gestational age, and key milestones.
Open Egg Freezing Calculator Estimate live-birth probability from frozen eggs by age and egg count. Get personalized success-rate projections for 1, 2, or 3 children based on current clinic data.
Open Fundal Height Calculator: SFH by Week, Fetal Weight Estimate Check your symphysis-fundal height (SFH) against gestational age percentiles, detect small or large for dates, and estimate fetal weight using Johnson's formula.
Open Gestational Age Calculator Find gestational age in weeks and days from LMP, conception, IVF transfer, ultrasound, or a known due date. See trimester, conception date, due date, and milestone dates.
Open hCG Levels Calculator Calculate your beta-hCG doubling time from two blood draws, or compare a single hCG result to the normal reference range for your week of pregnancy.
Open Implantation Calculator Find your implantation window, most likely implantation day, and earliest pregnancy test date. Works for natural cycles and IVF embryo transfers.
Open IVF Due Date Calculator Calculate your IVF or FET due date from your embryo transfer date. Supports day-3, day-5, day-6, and egg retrieval, with trimester dates and milestones.
Open Luteal Phase Calculator Calculate your luteal phase length from your ovulation date and next period, or estimate it from your last period and cycle length. Normal, short, or long?
Open MCA-PSV Calculator - Fetal Anemia Risk Calculate MCA peak systolic velocity MoM to screen for fetal anemia. Enter gestational age and observed PSV to get the median, MoM, and clinical interpretation.
Open Mean Sac Diameter Calculator Calculate mean sac diameter from three ultrasound measurements and estimate gestational age in weeks and days. Includes a reference table, due date, and accuracy notes.
Open Nuchal Translucency Calculator Calculate the nuchal translucency percentile, MoM, gestational age from CRL, and adjusted trisomy 21 risk. Free, accurate, and instant results.
Open Ovulation Calculator Find your ovulation day, fertile window, best days to conceive, when to test, and the due date if you conceive, plus a multi-cycle fertility calendar.
Open Pearl Index Calculator Calculate the Pearl Index for a contraceptive study from women, months, and pregnancies to get the failure rate per 100 woman-years, with method comparisons.
Open Period Calculator Predict your next periods with start and end dates, ovulation day and fertile window. Project several cycles ahead and solve cycle length from two real dates.
Open Pregnancy Test Calculator Find the earliest day to take a pregnancy test by cycle or IVF transfer date. See hCG levels by DPO, test brand sensitivity, and a week-by-week reference chart.
Open Pregnancy Weight Gain Calculator See your recommended pregnancy weight gain by pre-pregnancy BMI using IOM/NASEM guidelines, your on-track range and projected weight this week, for one baby or twins.
Open Progesterone to Estrogen Ratio Calculator Calculate your progesterone-to-estrogen (Pg/E2) ratio from lab values in any unit. See your hormone balance status, reference ranges, and clinical interpretation.
Open Reverse Due Date Calculator Enter your due date or birthday and instantly find the estimated conception date, the intercourse window, and key pregnancy milestones on a week-by-week timeline.
Open Sperm Analysis Calculator Interpret semen analysis results with WHO 6th Edition (2021) reference values. Calculates total sperm count, TMSC, and functional sperm, and flags abnormalities.
Open Stillbirth Risk Calculator Estimate stillbirth risk based on maternal age, BMI, ethnicity, obstetric history, and medical conditions. Uses peer-reviewed odds ratios. Results are educational only.
Open Testosterone to Estradiol Ratio Calculator Calculate your testosterone to estradiol (T/E2) ratio with unit conversion between ng/dL, nmol/L, pg/mL, and pmol/L, plus hormone reference ranges.
Open VBAC Calculator (Vaginal Birth After Cesarean) Estimate your VBAC success probability with the Grobman antenatal model and Flamm intrapartum score. Enter age, BMI, and obstetric history for instant results.
Open VTE Risk Score Calculator in Pregnancy (RCOG) Calculate your VTE risk score in pregnancy using the RCOG Green-top Guideline No. 37a. Get antepartum and postpartum thromboprophylaxis recommendations instantly.
Open
Dietary 31
Added Sugar Intake Calculator Find your personalized daily added sugar limit based on sex, age, weight, height, and activity level. Compare AHA, WHO, and FDA guidelines instantly.
Open BEE Calculator (Basal Energy Expenditure) Calculate Basal Energy Expenditure with the Harris-Benedict equation. Apply stress factors, activity level, and fever correction to find Total Energy Expenditure.
Open BMR Calculator Find your basal metabolic rate with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle, then see daily calories by activity level. Metric or imperial, kcal or kJ.
Open BMR Calculator (Basal Metabolic Rate - Mifflin-St Jeor) Calculate your Basal Metabolic Rate with the Mifflin-St Jeor equation. Get your BMR, daily calorie needs by activity level, and calorie targets for weight loss or gain.
Open Calorie Calculator Find your daily calorie needs with three BMR formulas, six weight goals, a macro split, a 7-day zigzag plan, time to your target weight, and a food-cost estimate.
Open Calorie Deficit Calculator Find your daily calorie deficit, target intake, and time to your goal weight. Enter maintenance calories or estimate them from your age, sex, height, weight, and activity.
Open Calorie Intake Calculator Find your daily calorie needs with the Mifflin-St Jeor equation. Enter age, sex, height, weight and activity level to get your TDEE and goal calorie targets instantly.
Open Carb Calculator (Carbohydrates) Calculate your daily carbohydrate needs in grams and calories. Enter age, sex, height, weight, activity level, and carb percentage to see your personalised intake target.
Open Diet Risk Score Calculator Score your diet across 9 food groups in under a minute. See your unhealthy and healthy food scores, total risk out of 27, your risk category, and targeted tips.
Open DRI Calculator Calculate your personalized Dietary Reference Intakes (DRI) for protein, carbs, fiber, 8 vitamins and 8 minerals based on age, sex, life stage, and activity level.
Open Fat Intake Calculator Find your daily fat target in grams from your calories, or from your age, sex, height, weight and activity. See the 20-35% range, saturated fat limit and food equivalents.
Open Fiber Calculator Find your daily fiber from calories or your age, sex and life stage. See your fiber gap, the soluble vs insoluble split and food servings to hit your target.
Open Gastric Sleeve Weight Loss Calculator Estimate your gastric sleeve weight loss with %EWL and %TBWL projections at 3, 6, 12, 18, and 24 months. Instant metric and imperial results with a full timeline chart.
Open Harris-Benedict Calculator (Basal Metabolic Rate) Calculate your Basal Metabolic Rate with the Harris-Benedict equation. Get TDEE, daily calorie targets for weight loss or gain, and a full activity breakdown.
Open IIFYM Calculator (If It Fits Your Macros) Calculate your TDEE and daily protein, carbs, fat and fiber targets using the Mifflin-St Jeor or Katch-McArdle formula. Customize by goal and activity level.
Open Katch-McArdle Calculator Calculate your Basal Metabolic Rate using the Katch-McArdle formula, which accounts for lean body mass. Get BMR, TDEE, and daily calorie targets for your goal.
Open Keto Calculator Calculate your personal keto macros: daily calories, grams of fat, protein, and net carbs based on your weight, height, age, sex, activity level, and goal.
Open Macro Calculator Find your daily protein, carb, and fat grams. Enter a calorie target or let the calculator estimate it from your body stats, goal, and activity level.
Open Maintenance Calorie Calculator Calculate your maintenance calories (TDEE) with the Mifflin-St Jeor formula. Enter age, weight, height and activity level for your daily calorie target and macros.
Open Meal Calorie Calculator Split your daily calorie target across 3, 4, or 5 meals with evidence-based portion sizes. Enter your TDEE or calculate it from your stats. Free and instant.
Open Micronutrient Calculator Find your personalised daily vitamin and mineral needs by age, sex and life stage. Based on NASEM Dietary Reference Intakes (DRI) - RDA, AI and UL included.
Open Net Carbs Calculator Calculate net carbs from any nutrition label. Enter total carbs, fiber, and sugar alcohols - erythritol, xylitol, maltitol and more - with correct absorption factors.
Open Protein Calculator Find how much protein you need per day from your weight, age, sex, activity and goal. Shows a gram range, per meal split, g/kg, RDA baseline and food cost.
Open Quarantine Activity Calculator See how quarantine changes your daily calorie burn. Enter your before and during routines to get TDEE, PAL, and the calorie gap in seconds.
Open RMR Calculator - Resting Metabolic Rate Calculate your Resting Metabolic Rate in calories per day using Mifflin-St Jeor or Harris-Benedict. Get your TDEE by activity level, metric or imperial.
Open TDEE Calculator - Total Daily Energy Expenditure Calculate your TDEE (Total Daily Energy Expenditure) using Mifflin-St Jeor or Katch-McArdle. Get BMR, calorie goal, and macro breakdown for cut, maintain, or bulk.
Open Vitamin A Calculator Convert vitamin A from IU to mcg RAE for retinol, beta-carotene, and supplements. Compare your total intake to your age- and sex-specific RDA and upper safe limit.
Open Vitamin D Calculator Find your recommended daily vitamin D intake (IU and mcg), check your serum 25(OH)D status, and get a supplement dose based on age, sex, and health factors.
Open Vitamin Daily Intake Calculator Find daily vitamin requirements by age, sex, and life stage. All 14 vitamins with RDA, AI, and upper intake limits based on National Academies DRI tables.
Open Weight Gain Calculator Calculate exactly how many calories to eat per day to reach your target weight. Uses Mifflin-St Jeor, gives you TDEE, surplus, macros, and a week-by-week schedule.
Open Weight Watchers Points Calculator Calculate WW points using SmartPoints, PointsPlus, or Classic formula. Get your daily points budget by age, gender, weight, and activity level.
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Hematology 27
4T Score Calculator - HIT Risk Assessment Calculate the 4T score for heparin-induced thrombocytopenia (HIT). Enter four clinical criteria to get your pre-test probability and management guidance.
Open Absolute Eosinophil Count Calculator Calculate your absolute eosinophil count from WBC and eosinophil percentage. Instant AEC result with normal range, eosinophilia severity, and clinical interpretation.
Open Absolute Lymphocyte Count Calculator Calculate absolute lymphocyte count from WBC and lymphocyte percentage. Get ALC with normal ranges, CD4 correlation, age-based reference table, and clinical interpretation.
Open Absolute Reticulocyte Count Calculator Calculate Absolute Reticulocyte Count (ARC), Corrected Reticulocyte Count, and Reticulocyte Production Index (RPI) instantly. Includes clinical interpretation ranges.
Open Age-Adjusted D-Dimer Calculator Calculate the age-adjusted D-dimer cutoff (age x 10 ng/mL FEU) to safely rule out pulmonary embolism in low-risk patients over 50. Supports FEU and DDU units.
Open Albumin Globulin Ratio Calculator Calculate your albumin to globulin (A/G) ratio from serum albumin and total protein. Includes globulin, interpretation, and reference ranges for both g/dL and g/L.
Open Allowable Blood Loss Calculator Calculate the maximum allowable blood loss (ABL) before transfusion using the Gross formula. Supports hematocrit and hemoglobin modes for all patient types.
Open ANC Calculator - Absolute Neutrophil Count Calculate your Absolute Neutrophil Count (ANC) from WBC and neutrophil percentages. Get NCI CTCAE neutropenia grade, infection risk, and clinical interpretation instantly.
Open ANC Calculator without Bands Calculate Absolute Neutrophil Count (ANC) without band neutrophils. Enter WBC and segmented neutrophil percentage for instant neutropenia grading and infection risk.
Open Blood Donation Due Date Calculator Find your next blood donation date. Enter your last donation and type (whole blood, platelets, plasma, double red cell) to see your eligibility date and countdown.
Open Blood Donor Calculator Find your next eligible blood donation date, blood type compatibility, estimated blood volume, and how many lives you can save per year. Free, instant results.
Open Blood Type Calculator Enter both parents' blood types and get the probability of each of the 8 possible blood types for their child, plus Punnett square logic and transfusion compatibility.
Open Blood Volume Calculator Estimate total blood volume from sex, height, and weight using Nadler, Lemmens-Bernstein-Brodsky, or weight-based methods, with red cell and plasma volume by hematocrit.
Open Corrected Reticulocyte Count Calculator Calculate the corrected reticulocyte count (CRC) and reticulocyte production index (RPI) from hematocrit and reticulocyte%, with clinical interpretation.
Open DIC Syndrome Calculator (ISTH Score) ISTH DIC score calculator for disseminated intravascular coagulation. Enter platelet count, D-dimer, PT prolongation, and fibrinogen for an instant scored result.
Open Diffuse Large B-Cell Lymphoma (DLBCL) Prognosis Calculator Calculate your DLBCL prognosis using the IPI or Revised IPI (R-IPI). Get a risk group, estimated 4-year overall survival, and progression-free survival instantly.
Open Fresh Frozen Plasma (FFP) Dose Calculator Calculate the total FFP volume and number of units needed by weight and dose. Includes dosing range, unit count, factor-level rise estimate, and clinical reference table.
Open Hematocrit to Hemoglobin Ratio Calculator Calculate your HCT/HGB ratio. Enter hematocrit and hemoglobin to get the ratio, interpret results, estimate one from the other, and check normal reference ranges.
Open INR Calculator Calculate your International Normalized Ratio from prothrombin time and ISI. Get instant INR, bleeding risk category, and condition-specific therapeutic targets.
Open Iron Deficiency Calculator (Ganzoni Equation) Calculate total iron deficit in mg using the Ganzoni equation. Enter weight, actual and target hemoglobin to find the IV iron dose needed to correct anemia.
Open Mentzer Index Calculator Calculate the Mentzer Index from MCV and RBC to help distinguish beta thalassemia trait from iron deficiency anemia, with interpretation and normal ranges.
Open MIPI Calculator - Mantle Cell Lymphoma International Prognostic Index Calculate the MIPI and MIPIb scores for mantle cell lymphoma from age, ECOG status, LDH, WBC, and Ki-67. Get the score, risk group, and median survival.
Open mmol/L to mg/dL Calculator Convert blood glucose between mmol/L and mg/dL instantly. Includes bidirectional conversion, clinical reference ranges, and WHO fasting glucose categories.
Open NLR Calculator (Neutrophil-to-Lymphocyte Ratio) Calculate the neutrophil-to-lymphocyte ratio (NLR) from absolute counts or WBC differentials. See clinical interpretation, inflammation bands, and disease-specific thresholds.
Open Plasma Volume Calculator Calculate plasma volume, RBC volume, and total blood volume via the Nadler formula. Enter sex, height, weight, and hematocrit for an instant, accurate estimate.
Open RBC Indices Calculator - MCV, MCH, and MCHC Calculate MCV, MCH, and MCHC from your hemoglobin, hematocrit, and RBC count. Get instant results, clinical interpretations, and anemia classification.
Open Transferrin Saturation Calculator Calculate transferrin saturation (TSAT) from serum iron and TIBC or transferrin, with reference ranges, UIBC, and interpretation for iron deficiency and overload.
Open
Dosage 27
Adderall Dosage Calculator Calculate the FDA-recommended Adderall starting dose, titration step, and maximum daily dose by age group and indication (ADHD or narcolepsy) for both IR and XR formulations.
Open Aleve Dosage Calculator Find the right Aleve (naproxen sodium) dose for adults and children. Select your condition, weight, and tablet strength for a complete dosing schedule.
Open Benadryl Dosage Calculator Calculate the correct Benadryl (diphenhydramine) dose by weight and age for children and adults. Get liquid volume, tablet count, daily max, and frequency.
Open Benzodiazepine Conversion Calculator Convert any benzodiazepine dose to its equivalent in 15 other benzodiazepines. Shows diazepam-equivalent, half-life, and a full equivalency reference table.
Open Carboplatin Dose Calculator (AUC / Calvert Formula) Calculate carboplatin dose using the Calvert formula and Cockcroft-Gault GFR. Supports actual, ideal, and adjusted body weight with the FDA-recommended GFR cap.
Open Cefdinir Dose Calculator Calculate the correct cefdinir dose by weight and indication for adults and children. Includes suspension volume, renal adjustment, and treatment duration.
Open Dosage Calculator Calculate the correct medication dose by weight (mg/kg), convert to liquid mL or tablet count, see your daily total, and get a full per-dose schedule.
Open Drug Half-Life Calculator Calculate how much of a drug remains in your body over time. Enter dose and half-life to get remaining concentration plus clearance times at 50%, 95%, and 99%.
Open Fish Oil Dosage Calculator Calculate your optimal daily fish oil (EPA+DHA) dose by age group, health goal, body weight, and supplement concentration. Includes capsule count and safety check.
Open Gabapentin Dosage Calculator Calculate gabapentin doses for neuropathic pain, epilepsy, and RLS. Includes pediatric weight-based dosing, renal (CrCl) adjustment, and a titration schedule.
Open Hydroxychloroquine Dose Calculator Calculate the safe hydroxychloroquine dose by weight (AAO 5 mg/kg guideline). Shows max daily dose, mg/kg ratio, retinopathy risk, and cumulative dose.
Open Isotretinoin Dose Calculator Calculate your isotretinoin (Accutane) cumulative dose, daily dose, and treatment duration in mg/kg. Tracks progress toward the 150-220 mg/kg evidence-based target.
Open IVIG Dose Calculator Calculate IVIG total dose in grams, infusion volume, dosing weight (adjusted or actual), and a step-by-step titration schedule. Metric and imperial units.
Open Levothyroxine Dosage Calculator Calculate your starting levothyroxine dose by weight using ATA guidelines. Covers hypothyroidism, thyroidectomy, pregnancy, and cardiac modifiers. Results in mcg/day.
Open Lidocaine Dose Calculator: Max Safe Dose by Weight Calculate the maximum safe dose of lidocaine or other local anesthetics by weight and concentration, with or without epinephrine. Shows mg and mL limits instantly.
Open Local Anesthetic Calculator Calculate the maximum safe dose and injection volume for lidocaine, bupivacaine, ropivacaine, and more, with an epinephrine toggle and lipid rescue dosing.
Open mcg to IU Converter Convert mcg to IU (or IU to mcg) for Vitamin D, A (retinol and beta-carotene), and E (natural and synthetic). Shows the formula, worked math, and safe upper limits.
Open Melatonin Dosage Calculator Find your recommended melatonin dose by indication: sleep onset, jet lag, shift work, and more. Get timing tips, supply totals, and evidence-based guidance.
Open MME Calculator - Morphine Milligram Equivalents Calculate daily MME for 13 opioids including fentanyl patch and methadone. Based on CDC 2022 guidelines with caution thresholds at 50 and 90 MME/day.
Open Opioid Conversion Calculator Convert between opioids and calculate daily MME using 2022 CDC conversion factors. Includes risk thresholds, equianalgesic doses, and cross-tolerance guidance.
Open Prescription Refill Calculator Find your next prescription refill date, days of supply remaining, and earliest eligible refill day for Medicare, commercial, or no-insurance plans. Free online tool.
Open Steroid Conversion Calculator Convert between corticosteroid doses instantly. Enter your current steroid and dose, choose the target steroid, and see the equipotent dose with potency and half-life details.
Open tPA Calculator - Stroke Dosing Calculate alteplase (tPA) dose for acute ischemic stroke: total dose, IV bolus, and 60-minute infusion in mg and mL. Based on the 0.9 mg/kg AHA/ASA standard.
Open Tramadol Dosage Calculator Calculate tramadol dosage for acute and chronic pain. Adjusts for age, weight, renal impairment, hepatic impairment, and formulation with safe-dose guidance.
Open Tylenol Dosage Calculator Calculate the right Tylenol (acetaminophen) dose by weight. Get mg per dose, mL for liquids, tablet count, max daily dose, and a 24-hour dosing schedule.
Open Tylenol Overdose Calculator Calculate acetaminophen overdose risk by mg/kg dose and weight, compare to the Rumack-Matthew nomogram threshold, and get oral or IV N-acetylcysteine dosing for reference.
Open Warfarin Dosing Calculator Estimate a warfarin starting dose with the Gage clinical algorithm, or get an ACCP-based weekly dose adjustment from your current INR, with step-by-step working.
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Electrolytes Fluids 22
Acid-Base Calculator Calculate buffer pH with the Henderson-Hasselbalch equation or interpret arterial blood gas (ABG) values for respiratory and metabolic acid-base disorders.
Open Anion Gap Calculator Calculate the serum anion gap from sodium, chloride and bicarbonate, with optional potassium, albumin correction, and a delta ratio to flag mixed acid-base disorders.
Open Arterial Blood pH Calculator Calculate arterial blood pH from bicarbonate and PaCO2 using the Henderson-Hasselbalch equation. Includes acid-base disorder classification, compensation phase, and anion gap.
Open Bicarbonate Deficit Calculator Calculate the bicarbonate deficit (mEq) needed to correct metabolic acidosis using the Ewald, standard, or Kurtz method. Enter weight, sex, and serum HCO3.
Open Corrected Calcium Calculator Albumin-corrected serum calcium with the Payne formula, plus an estimated ionized calcium, US/SI units, status banding and an adjustable correction factor and target albumin.
Open Corrected Magnesium Calculator Albumin-corrected serum magnesium using the Kroll-Elin formula. Enter measured Mg and albumin in mg/dL, mmol/L, or mEq/L for an instant corrected result.
Open Drops Per Minute Calculator Calculate IV drip rate in drops per minute from volume, time and drop factor. Includes reverse-solve, mL/hr flow rate, 15-second bedside count, and a worked example.
Open Free Water Deficit Calculator Calculate the free water deficit in hypernatremia using weight, sex, age, and serum sodium. Get infusion rates for 24 h, 48 h, and 72 h correction windows.
Open IV Drip Rate Calculator Calculate IV drip rate in drops per minute, plus mL/hr flow rate and drops per hour. Reverse-solve for infusion time or volume, with worked steps and a cost estimate.
Open IV Flow Rate Calculator Calculate IV drip rate in gtt/min and flow rate in mL/hr from volume, time, and drop factor. Covers macrodrip and microdrip tubing. Free nursing tool.
Open Parkland Formula Calculator Parkland burn fluid calculator with Rule of Nines TBSA estimator, kg or lb weight, elapsed-time adjustment, urine output target and IV drip rate in mL/hr and drops/min.
Open Plasma Osmolality Calculator Calculate plasma osmolality using the Smithline-Gardner formula. Get osmolal gap, ethanol correction, and interpretation of normal vs. abnormal results.
Open Serum Osmolality Calculator Calculate serum osmolality from sodium, BUN, and glucose. Includes osmolar gap when a measured value is entered, with clinical interpretation and normal ranges.
Open Sodium Change Calculator in Hypertriglyceridemia Correct a falsely low serum sodium caused by high triglycerides (pseudohyponatremia). Enter measured Na and TG levels to find the true corrected sodium.
Open Sodium Correction Calculator Correct serum sodium for hyperglycemia with the Katz (1.6) or Hillier (2.4) factor. Switch glucose units, compare both formulas, and see effective serum osmolality.
Open Sodium Correction Rate Calculator: Hyponatremia and Hypernatremia Calculate IV fluid infusion rate and serum sodium change using the Adrogue-Madias formula. Covers hyponatremia and hypernatremia with safety limits and step-by-step math.
Open Sodium Deficit Calculator Estimate the sodium deficit in mEq for hyponatremia from total body water, current and target sodium, plus a safe correction time and optional replacement-fluid volume.
Open Total Body Water Calculator Calculate total body water in litres and as a percentage of body weight using the Watson or Hume-Weyers formula. Includes ICF and ECF compartment breakdown.
Open Urine Anion Gap Calculator Calculate the urine anion gap (UAG) from sodium, potassium, and chloride. Instant interpretation: renal vs. extrarenal cause of non-gap metabolic acidosis.
Open Venous Blood pH Calculator Calculate venous blood pH using the Henderson-Hasselbalch equation from HCO3 and PvCO2. Instantly classify acid-base disorders and estimate equivalent arterial values.
Open Water Intake Calculator Find how much water to drink daily by weight, age, sex, exercise, climate and pregnancy. See total fluid, water from drinks vs food, cups, ounces and bottle count.
Open Winter's Formula Calculator Calculate expected PaCO2 using Winter's formula. Enter serum bicarbonate to get the compensation range and identify mixed acid-base disorders instantly.
Open
Urology Nephrology 19
Adrenal Washout Calculator: Adenoma vs Non-Adenoma CT Calculate absolute and relative adrenal washout percentages from CT Hounsfield Units. Classify adrenal nodules as likely adenoma or non-adenoma with interpretation.
Open Albumin-to-Creatinine Ratio (ACR) Calculator Calculate your urine ACR in mg/g or mg/mmol, see your KDIGO 2024 albuminuria category (A1, A2, A3), and understand what it means for kidney health.
Open Bladder Volume Calculator Calculate bladder volume from ultrasound dimensions using shape-specific ellipsoid formulas. Includes postvoid residual (PVR) interpretation and normal ranges.
Open BUN/Creatinine Ratio Calculator Find your BUN-to-creatinine ratio from BUN, urea, or international units (mmol/L, umol/L). See the normal 10 to 20 band, prerenal vs intrinsic clues, and full steps.
Open Creatinine Clearance Calculator Estimate creatinine clearance with Cockcroft-Gault from age, weight, sex and creatinine. Switch units, pick actual, ideal or adjusted body weight, and see BMI and BSA.
Open EORTC Bladder Cancer Recurrence and Progression Calculator Calculate EORTC recurrence and progression risk scores for non-muscle-invasive bladder cancer. Get 1-year and 5-year probability estimates with risk categories.
Open FENa Calculator (Fractional Excretion of Sodium) Calculate FENa (fractional excretion of sodium) to differentiate prerenal azotemia from acute tubular necrosis. Includes FEUrea for patients on diuretics.
Open FEUrea Calculator - Fractional Excretion of Urea Calculate fractional excretion of urea (FEUrea) to differentiate prerenal from intrinsic AKI. Supports mg/dL and mmol/L units with clinical interpretation.
Open GFR Calculator - Estimated Glomerular Filtration Rate Calculate your estimated GFR using the 2021 CKD-EPI creatinine equation. Get your eGFR, KDIGO stage, and kidney function percentage instantly.
Open Kidney Failure Risk Calculator (KFRE) Calculate your 2-year and 5-year kidney failure risk using the validated KFRE. Use the 4-variable model (age, sex, eGFR, ACR) or add serum labs for 8 variables.
Open Kidney STONE Score Calculator for Percutaneous Nephrolithotomy Calculate the STONE nephrolithometry score for percutaneous nephrolithotomy (PCNL). Predicts stone-free outcome probability from CT scan data in seconds.
Open Kt/V Calculator (Daugirdas) Calculate Kt/V with the Daugirdas second-generation formula. Enter pre/post BUN, session time, ultrafiltration volume and post-dialysis weight for the dialysis dose.
Open Metastatic Prostate Cancer Prognosis Calculator Estimate 5-year overall survival for metastatic castration-resistant prostate cancer using the PREVAIL 11-variable model. Includes survival curve and risk tier.
Open Protein Creatinine Ratio Calculator Calculate the urine protein to creatinine ratio (PCR/UPCR) from a spot urine sample. Get your proteinuria category, KDIGO stage, and plain-English interpretation.
Open PSA Density Calculator Calculate PSA density from prostate dimensions (length, width, height) and a serum PSA value. Includes age-stratified risk thresholds and clinical guidance.
Open PSA Doubling Time Calculator Calculate PSA doubling time (PSADT) from two serial PSA readings. Get doubling time in months, PSA velocity, risk category, and a growth projection chart.
Open TTKG Calculator: Transtubular Potassium Gradient Calculate the transtubular potassium gradient (TTKG) to assess renal potassium handling. Interprets results for hypokalemia and hyperkalemia with clinical guidance.
Open Urine Output Calculator Calculate urine output in ml/kg/hr for adults and children, check fluid balance, and flag oliguria, polyuria, or KDIGO AKI staging in seconds.
Open URR Calculator - Urea Reduction Ratio Calculate Urea Reduction Ratio (URR) and corresponding Kt/V instantly. Enter pre- and post-dialysis BUN levels in any unit to check hemodialysis adequacy.
Open
Body 18
ABSI Calculator - A Body Shape Index Calculate your A Body Shape Index (ABSI), z-score, and relative mortality risk in metric or imperial units. Based on NHANES data from the Krakauer 2012 study.
Open Adjusted Body Weight Calculator Find adjusted body weight, nutritional body weight, ideal body weight, %IBW, BMI and BSA from sex, height and weight. Choose Devine, Robinson, Miller or Hamwi.
Open BAI Calculator - Body Adiposity Index Calculate your Body Adiposity Index (BAI) from hip circumference and height. Get your body fat percentage estimate with sex- and age-specific categories.
Open Bedridden Patient Height Calculator Estimate bedridden patient height using knee height, demi-span, arm span, or ulna length. Chumlea, Cereda, Gray, and BAPEN formulas. Metric and imperial units.
Open Body Fat Calculator Estimate body fat percentage with the U.S. Navy tape method plus a BMI cross-check. Get fat mass, lean mass, your age-based ideal, and fat to lose to reach it.
Open Body Frame Size Calculator Find your body frame size, small, medium or large, by the wrist ratio or elbow breadth method. Sex-specific result plus a frame-adjusted healthy weight range.
Open Body Shape Calculator Enter bust, waist, high hip and hip measurements to find your body shape - hourglass, triangle, rectangle and more. Metric and imperial, instant results.
Open BSA Calculator - Body Surface Area Calculate body surface area using Du Bois, Mosteller, Haycock, Gehan & George, or Fujimoto formulas. Metric and imperial units, clinical reference ranges.
Open Face Shape Calculator Find your face shape from four simple measurements. Enter forehead, cheekbones, jaw width, and face length to get your shape, plus hair, glasses, and makeup tips.
Open FFMI Calculator (Fat-Free Mass Index) Calculate your Fat-Free Mass Index (FFMI) and normalized FFMI in metric or imperial. Includes sex-specific categories, the drug-free upper limit, and a full worked breakdown.
Open Ideal Weight Calculator Find your ideal body weight from five clinical formulas plus the healthy BMI weight range, with frame size adjustment, a target BMI weight and a current weight check.
Open Karvonen Formula Calculator Calculate your personalised heart rate training zones with the Karvonen formula. Enter your resting and max heart rate to get all 5 zones instantly.
Open Lean Body Mass Calculator Estimate lean body mass from height, weight and sex using the Boer, James or Hume formula, or from a known body fat percentage. See lean mass, fat mass and lean percent.
Open Ponderal Index Calculator Calculate the Ponderal Index (mass over height cubed) for adults or newborns in metric or imperial units, with the reciprocal index, BMI comparison and clear bands.
Open RFM Calculator (Relative Fat Mass) Calculate your Relative Fat Mass (RFM) using height and waist circumference. The 2018 Woolcott formula is more accurate than BMI. Get your body fat category instantly.
Open Skinfold Body Fat Calculator: Jackson-Pollock 3-Site and 7-Site Calculate body fat percentage from skinfold calipers using the Jackson-Pollock 3-site or 7-site equation. Get your ACE category, fat mass, and lean mass instantly.
Open Waist-to-Height Ratio Calculator Find your waist-to-height ratio (WHtR), see your Ashwell shape-chart category, and get the healthy waist range for your height. Metric or imperial, plus a target mode.
Open Waist-to-Hip Ratio Calculator Find your waist-to-hip ratio and WHO risk band, plus body shape, waist-to-height ratio, and the waist-size warning, in metric or imperial with show-your-work steps.
Open
Pulmonary 18
A-a Gradient Calculator Calculate the alveolar-arterial (A-a) oxygen gradient from ABG values with age-adjusted normal, PAO2, interpretation, and step-by-step workings.
Open BODE Index Calculator Calculate the BODE Index for COPD: enter BMI, FEV1 %, 6-minute walk distance, and mMRC dyspnea score to get a 0-10 prognosis score and 4-year survival estimate.
Open CURB-65 Calculator Score CURB-65 or CRB-65 from raw vitals or quick toggles. Get the 0 to 5 score, 30-day mortality risk band, suggested care setting, and a per-criterion breakdown.
Open Endotracheal Tube Size Calculator Calculate ETT size for adults, pediatric, and neonates. Get cuffed/uncuffed inner diameter and oral insertion depth using Cole's formula and weight-based neonatal sizing.
Open FEV1/FVC Ratio Calculator Calculate your FEV1/FVC ratio from measured or predicted values. Identifies obstructive, restrictive, and mixed patterns with GOLD severity grading.
Open Light's Criteria Calculator for Pleural Effusion Classify a pleural effusion as exudative or transudative using Light's three criteria: protein ratio, LDH ratio, and pleural LDH vs upper-normal limit.
Open Lung Cancer Risk Calculator Estimate your 6 and 16-year lung cancer risk using the Markaki model. Input smoking history, age, and BMI for absolute risk and USPSTF screening eligibility.
Open Lung Capacity Calculator Calculate Total Lung Capacity, Vital Capacity, Inspiratory Capacity, and Functional Residual Capacity from your lung volumes, plus predicted FVC and FEV1.
Open Lung Nodule Growth Rate Calculator Calculate lung nodule VDT, growth rate, and malignancy risk from two CT scan diameters. Uses the Schwartz formula with BTS and NELSON trial thresholds.
Open Mean Airway Pressure Calculator Calculate mean airway pressure (Paw) for volume control, pressure control, and APRV ventilation. Shows your work step by step with normal-range guidance.
Open Oxygenation Index Calculator Calculate the Oxygenation Index (OI) from FiO2, mean airway pressure, and PaO2. Includes ARDS severity grading, ECMO candidacy thresholds, and a BiPAP MAP estimator.
Open Peak Flow Calculator Estimate your predicted peak expiratory flow (PEF) by age, sex and height. Compare your reading to predicted values and find your asthma control zone instantly.
Open PF Ratio Calculator (PaO2/FiO2) Calculate PaO2/FiO2 ratio (Horowitz Index) and Oxygenation Index instantly. Includes ARDS Berlin classification, severity bands with mortality, and FiO2 device reference.
Open PSI Calculator - Pneumonia Severity Index (PORT Score) PSI/PORT score calculator for pneumonia. Enter age, comorbidities, vitals, and labs to get the risk class (I-V), 30-day mortality, and hospitalization recommendation.
Open Qp/Qs Calculator - Pulmonary to Systemic Flow Ratio Calculate Qp/Qs (cardiac shunt ratio) via the Fick O2 saturation method or echo LVOT/RVOT Doppler. Get instant clinical interpretation for ASD, VSD, and PDA shunts.
Open RSBI Calculator - Rapid Shallow Breathing Index Calculate the Rapid Shallow Breathing Index (RSBI) from respiratory rate and tidal volume. Includes weaning readiness interpretation and COPD-adjusted thresholds.
Open Tidal Volume Calculator Calculate tidal volume for spontaneous breathing or mechanical ventilation using the Devine IBW formula and the ARDSNet 6 mL/kg lung-protective protocol.
Open Vital Capacity Calculator Calculate your predicted vital capacity (VC) from age, sex and height using the Berglund equations, or derive it from your IRV, TV and ERV spirometry values.
Open
Addiction Medicine 17
Addiction Calculator (AUDIT Alcohol Screener) Free AUDIT alcohol use disorder screener. Answer 10 WHO-validated questions to get your risk score (0-40), risk zone, and personalised next steps.
Open Alcohol Unit Calculator Calculate alcohol units and calories from any drink by ABV and volume, compare against weekly guidelines, and see a breakdown by drink type for 16 countries.
Open AUDIT Score Calculator - WHO Alcohol Use Test Take the official 10-question WHO AUDIT screening test. Get your total score, risk zone, domain breakdown, and an AUDIT-C subscore instantly in your browser.
Open BAC Calculator Estimate blood alcohol content with the Widmark formula. Add beer, wine and liquor by ABV, set weight, sex and time, then see peak BAC and hours to sober.
Open BAC Calculator (Blood Alcohol Content) Estimate your blood alcohol content (BAC) using the Widmark formula. Enter your drinks, weight, sex, and time drinking to see BAC, sobriety time, and effects.
Open Caffeine Calculator Calculate your safe daily caffeine limit by body weight, see how much caffeine remains at bedtime, and find out when to stop drinking coffee. Metric and imperial.
Open CAGE Questionnaire Calculator Take the validated 4-question CAGE alcohol screening test online. Get an instant score, risk category, sensitivity data, and guidance on next steps.
Open Cigarette Calculator Calculate how much you spend on cigarettes per day, week, month and year, and see exactly how much you save by quitting, with an investment growth projection.
Open CIWA-Ar Calculator Score the 10-item CIWA-Ar scale for alcohol withdrawal in under 2 minutes. Get total score, severity level, and clinical guidance with each symptom explained.
Open DUDIT Calculator Take the validated 11-question DUDIT screening test online. Get your score, gender-specific interpretation, and guidance on what your result means.
Open Fagerstrom Test for Nicotine Dependence Calculator Take the validated Fagerstrom Test for Nicotine Dependence and get your FTND score (0-10), dependence level, and personalised cessation guidance.
Open Finnegan Score Calculator Score all 21 Modified Finnegan NAS signs across 3 domains. Get an instant total with clinical treatment thresholds, interpretation, and step-by-step calculation.
Open HSI Calculator - Heaviness of Smoking Index Calculate your Heaviness of Smoking Index (HSI) score to measure nicotine dependence. Get your low, medium, or high dependence rating with a step-by-step breakdown.
Open Pack-Year Calculator Calculate smoking pack-years from cigarettes per day and years smoked. Add a second period for changing habits, check USPSTF lung-screening eligibility, and see cost.
Open Smoking Recovery Calculator Calculate how much life you regain, money you save, and which health milestones you hit after quitting smoking. Personalised timeline from 20 minutes to 15 years.
Open Sobriety Calculator Count your days, weeks, months and years sober. See money saved, drinks avoided, and the health benefits you have unlocked along your recovery journey.
Open Standard Drink Calculator Convert any drink to standard drinks from volume and ABV or proof. Pick US, UK, AU, Canada or EU standards, count multiple drinks, see pure alcohol, calories and cost.
Open
Pediatric 14
Adjusted Age Calculator for Premature Babies Calculate a premature baby's corrected age. Enter birth date, gestational age or due date, and get adjusted age, developmental milestone dates, and a catch-up timeline.
Open Apgar Score Calculator (1, 5 & 10 Minute) Score a newborn Apgar at 1, 5 and 10 minutes from the five signs, each rated 0 to 2. See every total out of 10, the trend, a sign breakdown and what the bands mean.
Open Baby Eye Color Calculator Predict your baby's eye color probability from parents and grandparents. Uses polygenic genetics (HERC2/OCA2) to estimate chances of brown, hazel, green, or blue eyes.
Open Baby Formula Calculator Calculate how much formula your baby needs per day and per feeding by weight and age. Get feeding frequency, monthly canister usage, and cost estimate.
Open Baby's Milk Intake Calculator Calculate how much breast milk or formula your baby needs per day and per feeding by age and weight. Covers newborn through 12 months with metric and imperial units.
Open GIR Calculator - Glucose Infusion Rate Calculate neonatal and pediatric glucose infusion rate (GIR) in mg/kg/min from dextrose concentration and IV rate. Supports up to 3 solution lines and reverse-solve.
Open Height Calculator Predict your child's adult height using the mid-parental formula or the Khamis-Roche method. Works in metric (cm, kg) and imperial (ft/in, lb). Free and instant.
Open Maintenance Fluids Calculator Calculate pediatric maintenance fluids instantly with the Holliday-Segar method and 4-2-1 rule. Get daily volume, hourly rate, and bolus dose by patient weight.
Open Newborn Hyperbilirubinemia Assessment Calculator Calculate phototherapy and exchange transfusion thresholds for newborn jaundice using 2022 AAP guidelines. Enter TSB, age in hours, gestational age, and risk factors.
Open PECARN Pediatric Head CT Calculator PECARN pediatric head CT calculator for children with GCS 14-15 after blunt head trauma. Get risk category and CT recommendation, based on the Kuppermann 2009 study.
Open Pediatric Blood Pressure Calculator Calculate a child's blood pressure percentile and AAP 2017 category (normal, elevated, stage 1 or 2 hypertension) by age, sex, and height. Instant results.
Open Pediatric Blood Transfusion Volume Calculator Calculate the pRBC transfusion volume for a child from weight, target hemoglobin rise, and unit hematocrit. Uses the evidence-based Davies 2007 formula.
Open Pediatric Blood Volume Calculator Estimate a child's total blood volume by weight and age group. Instantly see safe blood draw limits (single, 24-hour, 8-week) used in clinical and research settings.
Open Pediatric GFR Calculator (Glomerular Filtration Rate) Estimate glomerular filtration rate in children using the original (1976) and revised bedside Schwartz (2009) formulas, with KDIGO CKD stage and worked steps.
Open
Intensive Emergency Care 14
Alvarado Score Calculator Calculate the Alvarado score (MANTRELS) for acute appendicitis. Enter 8 clinical and lab criteria to get an instant risk score from 0 to 10 with interpretation.
Open APACHE II Score Calculator APACHE II score calculator for ICU patients. Enter 12 physiological variables, age, and chronic health to get severity score and predicted hospital mortality.
Open GCS Calculator (Glasgow Coma Scale) Calculate a Glasgow Coma Scale (GCS) score instantly from eye, verbal, and motor responses. Includes TBI severity classification, component breakdown, and clinical guidance.
Open ICH Score Calculator: Intracerebral Hemorrhage 30-Day Mortality Calculate the ICH Score for intracerebral hemorrhage. Enter GCS, volume, IVH, origin, and age to get the 30-day mortality estimate with a full step-by-step breakdown.
Open Injury Severity Score (ISS) Calculator Calculate the Injury Severity Score (ISS) from AIS ratings across six body regions. Includes severity bands, worked steps, and a clinical reference table.
Open MEWS Score Calculator: Modified Early Warning Score Calculate the Modified Early Warning Score (MEWS) from systolic BP, heart rate, respiratory rate, temperature, and AVPU. Get a risk band and triage guidance instantly.
Open NIH Stroke Scale Calculator (NIHSS) Calculate the NIH Stroke Scale (NIHSS) score online. Enter all 11 assessment items to get total score, severity category, and clinical interpretation in seconds.
Open qSOFA Score Calculator Calculate the qSOFA (quick SOFA) score at the bedside in seconds. Three criteria, no lab tests. Instant risk interpretation and clinical guidance.
Open Revised Trauma Score Calculator Calculate the Revised Trauma Score (RTS) from GCS, systolic blood pressure, and respiratory rate. Get weighted RTS, triage RTS, and estimated survival probability.
Open SAPS II Calculator Calculate the SAPS II (Simplified Acute Physiology Score II) from 17 ICU variables. Get the total score and predicted in-hospital mortality probability instantly.
Open SCORAD Calculator - SCORing Atopic Dermatitis Calculate the SCORAD index for atopic dermatitis (eczema) from affected area, intensity signs, and symptoms to get a mild, moderate, or severe classification.
Open Sepsis Calculator (Sepsis-3 Criteria) Calculate qSOFA and full SOFA score using Sepsis-3 criteria. Screen for sepsis, assess organ dysfunction, and identify septic shock with our free clinical tool.
Open Shock Index Calculator Calculate Shock Index (SI), Modified Shock Index (MSI), and Age Shock Index instantly. Includes clinical risk bands, step-by-step math, and a reference table.
Open SOFA Score Calculator Calculate SOFA score for all 6 organ systems - respiratory, coagulation, liver, cardiovascular, CNS, and renal. Get ICU mortality risk estimate instantly.
Open
Diabetes 10
Blood Sugar Converter Convert blood glucose between mg/dL and mmol/L instantly. See your ADA 2025 fasting or post-meal category, exact formula, and a full reference chart.
Open Diabetes Risk Calculator Find your 10-year type 2 diabetes risk with the validated FINDRISC questionnaire. No blood test needed - answer 8 questions and get your risk score instantly.
Open Diabetic Ketoacidosis (DKA) Calculator Confirm ADA DKA criteria, classify severity (mild/moderate/severe), calculate anion gap with albumin correction, and estimate mortality risk. Results update instantly.
Open Estimated Average Glucose (eAG) Calculator Convert HbA1c to estimated average glucose (eAG) in mg/dL or mmol/L instantly. Uses the ADA ADAG formula with clinical ranges for diabetes management.
Open Glycemic Index Calculator Calculate the glycemic index and glycemic load of 60+ foods. Enter a portion size and get the GI value, GL score, blood sugar impact, and category instantly.
Open Glycemic Load Calculator Calculate glycemic load from any food's GI and carb content. Add up to three foods to get your meal GL with low/medium/high rating and a daily target tracker.
Open HOMA-IR Calculator - Insulin Resistance Calculate your HOMA-IR insulin resistance score from fasting glucose and insulin. Includes QUICKI index, HOMA-beta, result bands, and the full worked formula.
Open Insulin Dosage Calculator Calculate your mealtime bolus insulin dose in seconds. Enter carbs, blood glucose, carb ratio and ISF to get your carb coverage, correction dose and total units.
Open QUICKI Calculator - Quantitative Insulin Sensitivity Check Index Calculate your QUICKI insulin sensitivity score from fasting glucose and insulin, with interpretation bands, step-by-step math, and a HOMA-IR comparison.
Open Warsaw Method Calculator Calculate fat-protein units (FPUs), carb equivalents, extended bolus insulin dose, and dual-wave bolus duration for high-fat, high-protein meals in Type 1 diabetes.
Open
Digestive System 9
APRI Calculator Calculate your APRI score (AST to Platelet Ratio Index) to screen for liver fibrosis and cirrhosis. Includes fibrosis cutoffs and sensitivity data.
Open AST/ALT Ratio Calculator Calculate your AST/ALT (De Ritis) ratio instantly from lab values. See what your score means for alcoholic vs viral liver disease, NAFLD, and cirrhosis.
Open CDAI Calculator (Crohn's Disease Activity Index) Calculate the Crohn's Disease Activity Index (CDAI) score from 8 clinical inputs. Instant scoring with severity interpretation and step-by-step formula breakdown.
Open Child-Pugh Calculator Score cirrhosis severity from bilirubin, albumin, INR (or PT seconds), ascites and encephalopathy. Get Class A, B or C with 1 and 2 year survival and surgical risk.
Open FIB-4 Calculator Calculate your FIB-4 liver fibrosis index from age, AST, ALT and platelets, with age-adjusted cutoffs, the APRI score, AST/ALT ratio and clear interpretation bands.
Open Lille Score Calculator for Alcoholic Hepatitis Calculate the Lille score for alcoholic hepatitis. Predict 6-month survival after 7 days of steroid therapy. Supports mg/dL and umol/L with full interpretation.
Open Maddrey's Discriminant Function Calculator Calculate Maddrey's Discriminant Function for alcoholic hepatitis. Enter PT and bilirubin to get the mDF score, 30-day mortality risk, and steroid therapy guidance.
Open MELD Calculator: MELD, MELD-Na and MELD 3.0 Calculate MELD, MELD-Na, or MELD 3.0 for end-stage liver disease. Get 90-day mortality risk, transplant priority, and a step-by-step formula breakdown.
Open NAFLD Fibrosis Score Calculator Calculate your NAFLD Fibrosis Score (NFS) from age, BMI, diabetes status, AST/ALT ratio, platelet count, and albumin, with F0-F4 staging and interpretation.
Open
Percentile 8
Baby Percentile Calculator Find your baby's weight, length, and head circumference percentiles using official WHO growth charts for boys and girls aged 0-24 months. Instant results with z-scores.
Open Birth Weight Percentile Calculator Calculate a newborn's birth weight percentile by gestational age and sex using the Olsen 2010 US reference. Get SGA, AGA, or LGA classification and a percentile chart.
Open BMI Percentile Calculator for Children and Teens Calculate BMI percentile for children aged 2-20 using the CDC LMS method. Get BMI, z-score, weight category, and key percentile thresholds for your child's age and sex.
Open Fetal Weight Percentile Calculator Calculate estimated fetal weight (EFW) and growth percentile using the Hadlock 4-parameter formula. Enter BPD, HC, AC, and FL from your ultrasound report.
Open Head Circumference Percentile Calculator Enter your baby's age, sex, and head circumference to find their CDC percentile and z-score instantly. Covers birth to 36 months in cm or inches.
Open Height Percentile Calculator Find your height percentile among US adults (CDC NHANES data). Enter height, sex, and age group to get your percentile, z-score, and population comparison.
Open IQ Percentile Calculator Convert any IQ score to its percentile rank and rarity ("1 in X"). Supports SD 15 and SD 16, reverse lookup, and all major IQ classification systems.
Open Weight Percentile Calculator for Children (Ages 2-20) Find your child's weight percentile using CDC 2000 growth charts. Enter age, sex, and weight to get an exact percentile and z-score with a normal distribution visual.
Open
Army 7
ACFT Calculator Calculate your ACFT score instantly. Enter results for all 6 events, get total points, pass/fail status, MOS category, and a step-by-step breakdown by age and gender.
Open Air Force PT Calculator Calculate your 2026 US Air Force PFRA fitness test score. Enter run, push-ups, core, and waist-to-height ratio to get your composite score, breakdown, and pass/fail status.
Open APFT Calculator Calculate your APFT score instantly. Enter age, gender, push-ups, sit-ups, and run time to get your total score, pass/fail status, and badge eligibility.
Open Army Body Fat Calculator Run the 2023 Army one-site tape test: body fat percent, fat and lean mass, pass or fail against your standard, plus the weight to lose to hit the limit or DoD goal.
Open Geriatric BMI Calculator Senior BMI calculator using geriatric thresholds (healthy 23-27.9 kg/m2). Shows frailty risk, waist circumference flag, healthy weight range, and CDC senior cut-offs.
Open Navy Body Fat Calculator U.S. Navy tape body fat calculator: body fat %, fat mass, lean mass, ideal target, fat to lose, and the Navy pass/fail standard. Metric or imperial, no scale needed.
Open Navy PRT Calculator Calculate your U.S. Navy Physical Readiness Test score for push-ups, forearm plank, and the 1.5-mile run. Instant results with category breakdown by age and gender.
Open
Geriatric Medicine 7
Alzheimer's Life Expectancy Calculator Estimate life expectancy after an Alzheimer's diagnosis by disease stage (GDS 1-7), age, sex, and comorbidity burden, with a research-backed range and stage timeline.
Open Barthel Index Calculator (ADL) Score all 10 Barthel Index activities of daily living instantly. Get a 0-100 independence rating, functional band, domain breakdown, and clinical guidance.
Open Braden Score Calculator Calculate the Braden Score for pressure ulcer risk in seconds. Enter all 6 subscales to get the total score, risk category, and care recommendations.
Open Charlson Comorbidity Index (CCI) Calculator Calculate the Charlson Comorbidity Index (CCI) with all 19 conditions, age adjustment, and estimated 10-year survival. Free, instant, clinically validated.
Open Frailty Index Calculator Calculate the Frailty Index (Rockwood model). Enter deficits present and total assessed to get your FI score, clinical category, and 10-year projection.
Open Morse Fall Scale Calculator Calculate the Morse Fall Scale score instantly. Enter 6 clinical criteria to get a low, moderate, or high fall risk rating with recommended nursing interventions.
Open Tinetti Balance and Gait Calculator (POMA) Score the Tinetti POMA instantly: enter all 17 balance and gait items, get a total score, subscores, and a fall-risk classification with clinical interpretation.
Open
BMI 6
BMI Calculator Find your Body Mass Index in metric or imperial units, with your WHO category, BMI Prime, Ponderal Index, healthy weight range, and the weight to lose or gain.
Open BMI Calculator for Kids Calculate your child's BMI-for-age percentile using CDC growth charts. Get weight category, percentile rank, and percent of 95th percentile for ages 2-19.
Open BMI Calculator for Men Calculate your BMI as a man: get your WHO category, age-group percentile vs. US males, BMI Prime, healthy weight range, and weight to lose or gain.
Open BMI Calculator for Teens Calculate BMI for teens ages 2-19 using CDC growth chart percentiles. Get your BMI, percentile rank, weight category, and healthy weight range in metric or imperial.
Open BMI Calculator for Women Free BMI calculator for women. Get your Body Mass Index, WHO category, healthy weight range, BMI Prime, Ponderal Index, and population percentile in metric or imperial units.
Open BMI Weight Loss Calculator Find how much weight to lose or gain to reach any target BMI. Get current BMI, target weight, weight change needed, and a weekly timeline in metric or imperial units.
Open
Metabolic Disorders 6
Cholesterol Ratio Calculator Find your total-to-HDL, LDL-to-HDL and triglyceride-to-HDL cholesterol ratios plus non-HDL cholesterol from a lipid panel, with the heart-risk band for each.
Open Cholesterol Units Converter: mg/dL to mmol/L Convert total cholesterol, LDL, HDL, and triglycerides between mg/dL and mmol/L instantly. Includes reference ranges, risk categories, and a show-your-work panel.
Open Gout Diagnosis Calculator Calculate your gout likelihood score using the 2015 ACR/EULAR classification criteria and the Acute Gout Diagnosis Rule. Instant result with full scoring breakdown.
Open LDL Cholesterol Calculator Calculate LDL ("bad") cholesterol from total cholesterol, HDL and triglycerides using the Friedewald or Martin-Hopkins equation, in mg/dL or mmol/L, with risk targets.
Open SAAG Calculator - Serum-Ascites Albumin Gradient Calculate the serum-ascites albumin gradient (SAAG) instantly. Interpret portal hypertension vs. non-portal ascites with causes, formula and clinical guidance.
Open VLDL Cholesterol Calculator Estimate VLDL cholesterol from triglycerides using the Friedewald or Wilson formula. Get mg/dL or mmol/L results with risk category and plain-English interpretation.
Open
Pediatric Dosage 6
Amoxicillin Pediatric Dosage Calculator Calculate the correct amoxicillin dose for a child by weight and indication. Shows dose per administration, daily total, and liquid volume for 7 common indications.
Open Ibuprofen Dosage Calculator Calculate the safe ibuprofen dose by weight for children and adults. Shows mg dose, liquid volume, tablet count, dosing interval, and daily maximum.
Open Infant Tylenol Dosage Calculator Calculate the correct infant Tylenol (acetaminophen) dose by weight in mg and mL. Covers infants and children, all major formulations, with safety limits.
Open Paracetamol Dosage Calculator Calculate the correct paracetamol dose by weight. Get the recommended mg dose, safe daily maximum, and exact ml volume for any liquid syrup concentration.
Open Pediatric Dose Calculator Calculate a child medication dose by weight: single dose and daily total in mg, the liquid volume in mL from the concentration, frequency, and an optional max cap.
Open Pediatric Epinephrine Dose Calculator Calculate pediatric epinephrine doses by weight and route (IV, IM/SC, ET, nebulizer) in mg and mL. Covers children and neonates with max-dose safeguards.
Open
Sleep 6
AHI Calculator - Apnea-Hypopnea Index Calculate your Apnea-Hypopnea Index (AHI) from total apnea and hypopnea events and sleep duration. Includes severity classification for adults and children.
Open Epworth Sleepiness Scale Calculator Take the Epworth Sleepiness Scale questionnaire to measure your daytime sleepiness. Get your ESS score, category, and guidance on next steps in under 2 minutes.
Open Pediatric Epworth Sleepiness Scale Calculator (ESS-CHAD) Calculate the ESS-CHAD score for children and adolescents aged 6-18. Get instant interpretation of daytime sleepiness severity with clinical guidance.
Open Sleep Calculator Find the best bedtime or wake-up time using 90-minute sleep cycles. Set your own cycle length and fall-asleep buffer, and check the hours against your age.
Open Sleep Debt Calculator Calculate your 7-day sleep debt by entering each night's sleep. Get your total deficit, severity level, estimated recovery timeline, and science-backed tips.
Open STOP-BANG Calculator Calculate your STOP-BANG score to screen for obstructive sleep apnea. Answer 8 yes/no questions and get your risk level: low, intermediate, or high.
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What Health Calculators Are Used For
Health calculators translate clinical measurements and personal data into numbers that help you and your care team monitor your body and make informed decisions. They do not replace a doctor's judgment, but they give you a concrete starting point for conversations about weight, nutrition, fitness, and chronic disease management. Understanding your own numbers makes those conversations far more productive.
Common Uses and Real-Number Examples
- BMI as a screening tool. A person who is 5 feet 9 inches tall and weighs 185 pounds has a BMI of about 27.3, which falls in the overweight range (25 to 29.9). A BMI calculator instantly converts height and weight into this standardized index and shows where the result sits on the standard scale, though clinicians note BMI does not account for muscle mass or body composition.
- Calorie budgeting for weight goals. A 35-year-old woman who is 5 feet 5 inches tall, weighs 150 pounds, and exercises three times a week has a daily calorie maintenance level of roughly 2,050 calories, calculated from the Mifflin-St Jeor equation adjusted for activity. Eating 500 calories below that each day creates a deficit expected to produce about one pound of loss per week.
- Heart rate training zones. If your maximum heart rate is estimated at 185 beats per minute (using 220 minus your age of 35), your aerobic training zone at 60 to 80 percent effort falls between 111 and 148 bpm. A heart rate zone calculator breaks this into five zones so you can match workout intensity to your fitness goal.
- Pregnancy and due date estimation. Entering the first day of your last menstrual period allows a due date calculator to estimate a delivery date 280 days (40 weeks) later, along with weekly milestones during each trimester.
Key Concepts in Plain Language
Basal metabolic rate (BMR) is the number of calories your body burns at complete rest just to keep organs functioning. Total daily energy expenditure (TDEE) multiplies BMR by an activity factor to estimate how many calories you actually burn in a day. Body fat percentage measures fat mass as a fraction of total body weight, which is more clinically informative than BMI alone but requires additional measurements like waist and hip circumference or skinfold thickness.
What to Look For When Using These Tools
Always note which equation or reference standard a calculator uses, because different formulas produce different results for the same inputs. The Harris-Benedict equation and the Mifflin-St Jeor equation for BMR, for example, can differ by 100 or more calories per day. Treat the output as an estimate rather than a precise prescription, and discuss any significant health decisions with a licensed healthcare provider. Results are only as reliable as the measurements you enter, so use a consistent scale, time of day, and clothing when tracking weight over time.