Categories · 22 tools
Conversions Calculators
Length, temperature, currency and unit conversions.
Inches → cm
Convert inches to centimeters instantly. Multiply by 2.54 — the relation is exact. Works both ways, with a quick reference table for common inch sizes.
Calculatecm → Inches
Convert centimeters to inches instantly. Divide by 2.54 — the relation is exact. Works both ways, with a reference table for the sizes you meet most often.
CalculateCelsius ↔ Fahrenheit
Convert Celsius to Fahrenheit and back, with Kelvin alongside. Enter a temperature and pick the scales — the formula and all three readings are shown.
CalculateCurrency Converter
Convert between the US dollar, euro, pound, yen and other major currencies. Use the reference rates for a quick estimate, or enter today rate for an exact figure.
Calculatekg → lb
Convert kilograms to pounds and back. One kilogram is about 2.2046 pounds. Handy for body weight, luggage, gym plates and recipes in US units.
Calculateg → oz
Convert grams to ounces and back. One ounce is about 28.35 grams. Essential for cooking and baking with recipes written in the other system.
Calculatem → ft
Convert meters to feet and back. One meter is about 3.2808 feet. Useful for height, room dimensions, land and any spec sheet in the other system.
Calculatekm → mi
Convert kilometers to miles and back. One mile is about 1.609 kilometers. Handy for distances, running races, road trips and car odometers.
CalculateL → gal
Convert liters to US gallons and back. One US gallon is about 3.785 liters. Useful for fuel, tanks, aquariums and recipes. Note: the UK gallon is larger.
CalculateRoman Numerals
Convert Roman numerals to numbers and back. Type 2024 to get MMXXIV, or enter a Roman numeral to read its value. Works from 1 to 3999.
CalculatemL → L
Convert milliliters to liters and back. One liter is 1,000 milliliters. Handy for recipes, drinks, dosing and lab measurements.
CalculateSpeed
Convert speed between mph, km/h, m/s, knots and ft/s. Enter a value and pick the units to convert from and to.
CalculateArea
Convert area between square feet, square meters, square inches, square yards, acres, hectares, square kilometers and square miles.
CalculatePressure
Convert pressure between psi, bar, pascals (Pa), kilopascals (kPa), atmospheres (atm) and mmHg. Handy for tires, weather and engineering.
CalculateEnergy
Convert energy between joules, kilojoules, calories, kilocalories (food Calories), watt-hours, kilowatt-hours and BTU.
CalculateData Storage
Convert digital storage between bits, bytes, KB, MB, GB and TB using binary units (1 KB = 1024 bytes), the way an operating system counts.
CalculateTime Units
Convert time between seconds, minutes, hours, days, weeks, months and years. Enter a value and choose the units to convert from and to.
CalculateUnit Converter
Convert length between mm, cm, m, km, inches, feet, yards and miles — all at once. A complete metric-to-imperial length converter.
CalculateDegrees -> Radians
Convert angles between degrees and radians. 180 degrees equals pi radians. Useful for trigonometry, physics and programming.
CalculateNumber Base
Convert numbers between binary, octal, decimal and hexadecimal. Enter a value and its base to see the representation in every base at once.
Calculate