Unit Conversion Calculators
Free online unit converters with instant results
Convert between units of length, weight, temperature, volume, area, speed, energy, pressure, power, data storage, and more. All converters are free, show real-time results as you type, and display conversions to all supported units at once.
Length Converter
Convert mm, cm, m, km, inches, feet, yards, miles, and more.
Weight Converter
Convert mg, g, kg, ounces, pounds, stones, and tons.
Temperature Converter
Convert between Fahrenheit, Celsius, Kelvin, and Rankine.
Volume Converter
Convert ml, liters, gallons, quarts, pints, cups, fluid ounces, and more.
Area Converter
Convert sq ft, sq m, sq in, sq yd, acres, hectares, and sq km.
Speed Converter
Convert mph, km/h, m/s, ft/s, knots, and Mach.
Time Converter
Convert seconds, minutes, hours, days, weeks, months, and years.
Energy Converter
Convert joules, calories, kilocalories, kWh, BTU, and eV.
Pressure Converter
Convert PSI, bar, atm, Pa, kPa, mmHg, and torr.
Power Converter
Convert watts, kilowatts, horsepower, BTU/hr, and ft-lbs/s.
Data Storage Converter
Convert bytes, KB, MB, GB, TB, PB, and bits.
Fuel Economy Converter
Convert mpg, L/100km, km/L, and miles/L.
Angle Converter
Convert degrees, radians, gradians, arcminutes, and arcseconds.
Frequency Converter
Convert Hz, kHz, MHz, GHz, and RPM.
Related Categories
Frequently Asked Questions
How do unit converters work?
Enter a value in any unit and instantly see the conversion to all supported units. Our converters use precise conversion factors and update results in real-time as you type.
What unit conversions are available?
We offer 14 converter categories: length, weight, temperature, volume, area, speed, time, energy, pressure, power, data storage, fuel economy, angle, and frequency. Each converter supports a comprehensive list of units.
Are the conversions accurate?
Yes. All conversions use internationally recognized conversion factors. Results are displayed with up to 6 significant figures for precision.
Can I convert mm to inches?
Yes! Our Length Converter supports mm, cm, m, km, inches, feet, yards, miles, nautical miles, micrometers, and nanometers. Simply enter your value and select the units.