Conversion calculators

Fast, exact unit conversions for length, weight, volume and more.

51 published calculators

Volume And Weight 18

CCF to Gallons Conversion Convert CCF to gallons (US or UK) instantly. Enter CCF from your water bill or input gallons to reverse-convert. Exact and billing-rounded results. Open Cubic Feet Calculator Calculate cubic feet for any shape: box, cylinder, sphere, cone or triangular prism. Mix units (ft, in, yd, cm, m), get instant conversions and an optional cost estimate. Open Cubic Yards to Tons Calculator Convert cubic yards to tons with 20+ material presets (gravel, sand, concrete, mulch) or a custom density. Get short tons, long tons, and metric tonnes. Open Drops to mL Conversion Calculator Convert drops to milliliters instantly. Choose your dropper type, enter drops or mL, and get the reverse conversion with a worked step and reference table. Open Gallon Calculator Free gallon calculator: convert US, UK, or dry gallons to liters, milliliters, fluid ounces, cups, quarts, pints, cubic feet, and more. Includes water weight. Open Gallons to Pounds Converter Convert gallons to pounds for water, milk, gasoline, honey, oil, and 20+ liquids. Custom density mode, reverse lbs-to-gallons, and a full reference table. Open Grams to Ounces Calculator Convert grams to ounces instantly - avoirdupois (food, goods) or troy (gold, silver). Includes reverse oz to g, conversion table, formula and worked example. Open kg to Gallons Converter Convert kilograms to US or UK gallons (and back) for water, fuel, milk, oil, honey and more. Instant results with step-by-step working and a reference table. Open Kilograms to Pounds Converter Convert kg to lb, stones+pounds, and pounds+ounces instantly. Works in reverse too: enter pounds, grams, ounces or stones and read every unit at once. Open mg to mL Calculator Convert mg to mL instantly using substance density or medication concentration. Bidirectional, with preset liquids, common drug strengths, and step-by-step working. Open mL to Cups Converter Convert milliliters to cups or cups to mL instantly. Supports US, metric, nutrition label, imperial, and Japanese cup standards. Includes kitchen fraction helper. Open Oz to Cups Converter Convert fluid ounces or dry ounces to US, Imperial, or Metric cups instantly. Includes ingredient-specific densities for flour, sugar, butter, and more. Open Pint to Pound Conversion Convert pints to pounds for water, milk, honey, oil, fuel and 30+ other substances. Choose US or UK pints, enter a custom density, and see the full worked calculation. Open Pounds and Ounces Calculator: Convert and Add Weights Convert pounds and ounces to grams, kilograms, or decimal pounds, or add and subtract mixed lb-oz weights. Instant results with step-by-step working. Open Quarts to Pounds Conversion Convert quarts to pounds instantly for water, milk, flour, sugar, honey, oil and more. Supports liquid and dry quarts, reverse lb-to-qt mode, and custom density. Open Volume Conversion Calculator Convert any volume unit instantly: liters, milliliters, US and UK gallons, fluid ounces, cups, pints, quarts, cubic meters, cubic feet, barrels, and more. Open Volume Converter Convert volume between 20 units across metric, US liquid, US cooking, and UK imperial systems. Instant results with full conversion table and worked steps. Open Weight Calculator Calculate weight (force), mass, or gravity from any two known values. Solve W = m × g in metric or imperial units, compare 13 planets and moons. Open

Length And Area 10

Acreage Calculator Calculate land area in acres, sq ft, sq meters, and hectares for rectangles, triangles, circles, trapezoids, or ellipses. Add a price per acre to estimate land value. Open Area Converter Convert area between 11 units: m², cm², mm², km², ft², in², yd², mi², acres, hectares and ares. Includes real-world size comparisons and a price-per-area estimator. Open Astronomical Unit Calculator Convert astronomical units to kilometres, miles, light-years, parsecs, and light travel time. Includes solar system planet distances and reverse conversion. Open Feet and Inches Calculator Add, subtract, multiply or divide feet-and-inches measurements instantly. Get results in feet-inches, decimal feet, total inches, centimeters, and millimeters. Open Height in Inches Calculator Convert any height to inches instantly: feet and inches, centimeters, or meters. See the full breakdown in every unit with the formula and worked examples. Open Inches to Fraction Calculator Convert decimal or metric inches to the nearest fraction (1/2 to 1/128 in). Includes mm and cm outputs, reverse fraction-to-decimal mode, and rounding error. Open Length Converter Convert length across 9 units instantly: mm, cm, m, km, inches, feet, yards, miles and nautical miles. See feet-and-inches compound form and a full conversion table. Open Light-Year Conversion Calculator Convert light-years to kilometers, miles, meters, AU, or parsecs instantly. See the math, get context on cosmic distances, and compare to famous stars. Open Mesh to Micron Converter Convert mesh size to microns, millimeters, and inches using ASTM E11 standard values. Reverse-solve from microns to mesh. Includes full sieve reference table. Open Pixels to Inches Converter Convert pixels to inches (or inches to pixels) using any PPI value. Also outputs millimeters, centimeters, and points. Includes common device PPI reference. Open

Force Pressure And Torque 9

Force Converter Convert force across 11 units: newtons, kN, MN, pound-force, kip, poundal, ounce-force, dyne, kgf, ton-force and sthene. Exact SI factors, plus F = ma mode. Open Inch-Pounds to Foot-Pounds Converter Convert inch-pounds to foot-pounds instantly. Get ft-lb, Newton-metres, and kgf-cm in one step, plus a worked example, torque spec table, and reverse conversion. Open Lbs to Newtons Converter Convert pounds-force to newtons instantly. Enter lbs or N for bidirectional results, see the formula, stepped math, kilonewtons, and a full reference table. Open Newton Meter Calculator Convert newton-meters to foot-pounds, inch-pounds, kgf·m, and 11 more torque units instantly. Includes the conversion formula, worked example, and a reference table. Open Nm to ft-lbs Converter Convert newton-meters to foot-pounds (and back) instantly. See the formula, worked example, common automotive torque specs, and extra unit outputs including in-lbs and kgf-m. Open Pressure Conversion Calculator Convert pressure between 17 units: Pascal, kPa, MPa, bar, psi, atm, Torr, mmHg, inHg, mbar and more. Instant results with step-by-step math and a reference table. Open PSI to GPM Calculator Convert PSI to GPM (and GPM to PSI) for pipes and orifices. Uses Hazen-Williams and Bernoulli equations. Supports reverse solve, multiple pipe materials, and real-time chart. Open Torque to HP Calculator Convert torque and RPM to horsepower (and back) instantly. Supports lb-ft and N-m inputs, shows power in HP and kW, power-to-weight ratio, and a worked step-by-step breakdown. Open Torr to atm Conversion Calculator Convert torr to atmospheres instantly. Enter torr or atm and get the result plus Pa, kPa, bar, psi, and inHg. Formula, worked example, and reference table included. Open

Number 8

Billion to Trillion Converter Convert billions to trillions instantly. Supports short scale (US/UK) and long scale (EU). See full number, scientific notation, and reverse trillion-to-billion. Open Crore to Lakh Converter Convert crores to lakhs instantly, with the formula shown step-by-step. Also see the equivalent in millions, billions, thousands, and arabs. Works in reverse too. Open Crore to Million Converter Convert crore to million instantly - and get the lakh and billion equivalents too. Switch to million-to-crore mode for reverse conversions. Free, no sign-up. Open Million to Billion Converter Convert millions to billions instantly - and to thousands, trillions, lakhs and crores. Bidirectional, with scientific notation, a scale table and worked examples. Open Million to Lakh Converter Convert millions to lakh and lakh back to millions. See the result in crores and billions, in both Indian and international format, with a step-by-step explanation. Open Million to Thousand Converter Convert millions to thousands or thousands to millions instantly. See the full number scale from hundreds to trillions, scientific notation, and the Indian lakh/crore system. Open Number to Billion Converter Convert any number to billions instantly. See millions, trillions, lakhs, crores, and scientific notation. Bidirectional: enter billions to recover the full number. Open Number to Million Converter Convert any number to millions, billions, trillions, thousands, lakhs, or crores instantly. Shows all scales at once with reverse conversion and step-by-step workings. Open

Numeral Systems 6

Binary Converter Convert between binary, decimal, hexadecimal, and octal instantly. Supports signed and unsigned 8, 16, and 32-bit modes with step-by-step explanations. Open Binary to Hexadecimal Converter Convert binary to hexadecimal instantly. Supports integers and fractional binary numbers. See nibble grouping steps, decimal equivalents, and a full reference table. Open Binary to Octal Converter Convert binary to octal instantly, with a step-by-step grouping breakdown, decimal equivalent, reverse octal-to-binary mode, and a full reference table. Open Decimal to Hexadecimal Converter Convert any decimal number to hexadecimal instantly. See the hex, binary, and octal equivalents, a full step-by-step division table, and a reference chart. Open Decimal to Octal Converter Convert any decimal (base 10) number to octal (base 8) instantly. Shows step-by-step division, binary and hex equivalents, and a full reference table. Open Roman Numerals Converter Convert numbers 1-3,999,999 to Roman numerals or decode them back. Includes date conversion, place-value breakdown, and vinculum support. Open

What Conversion Calculators Are Used For

Unit conversion calculators bridge the gap between different measurement systems used around the world and across different fields. The United States still uses the imperial system for everyday life, while science and most countries use the metric system, which means conversion needs arise constantly in cooking, travel, construction, medicine, and engineering. A reliable conversion tool eliminates the mental arithmetic and reduces the chance of a costly or even dangerous mistake.

Common Uses and Real-Number Examples

Temperature for cooking and travel. A recipe from a European cookbook calls for 180 degrees Celsius. Converting using (Celsius times 9/5) plus 32 gives 356 degrees Fahrenheit, so you set your oven to 356 (or the nearest available setting, usually 350). Traveling to a country that reports weather in Celsius, 25°C converts to 77°F, a comfortable warm day.
Weight for international shipping or nutrition labels. A package weighs 2.5 kilograms. Multiplying by 2.20462 gives 5.51 pounds, which determines which shipping tier applies. For food, a serving size listed as 28 grams is just under one ounce (28 divided by 28.35 = 0.987 oz).
Length and distance for construction or travel. A European furniture assembly guide specifies a 650 mm gap. Dividing by 25.4 gives 25.6 inches. For road trips, 100 kilometers equals about 62.1 miles, so a 300 km drive is roughly 186 miles.
Volume for liquid measures. A medication dose listed as 5 mL is exactly one teaspoon. A recipe calling for 2 cups of water requires about 473 mL. A gas tank listed in liters (50 L) holds about 13.2 gallons.

Key Concepts in Plain Language

All unit conversions work by multiplying the original value by a ratio that equals one. One foot is exactly 0.3048 meters, so multiplying any length in feet by 0.3048 converts it to meters without changing what it actually measures. The metric system is built on powers of ten, so kilo means a thousand, centi means a hundredth, and milli means a thousandth. That prefix structure makes metric conversions simpler than imperial conversions, which rely on arbitrary factors like 12 inches per foot or 16 ounces per pound.

What to Look For When Using These Tools

Be precise about which type of unit you are converting. Fluid ounces and weight ounces are different units entirely. A US cup (236.6 mL) differs from an imperial cup (284 mL) used in some older UK recipes. Ton can mean a US short ton (2,000 pounds), a British long ton (2,240 pounds), or a metric tonne (1,000 kilograms). Always confirm the specific variant a conversion tool uses, especially in medical, legal, or safety-critical contexts where the difference matters.