Pulmonary calculators
18 calculators 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 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 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.
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