Convert between length, weight, temperature, volume, area, speed, time, data storage, pressure, energy, power, and angle units.
Length: millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles.
Weight: milligrams, grams, kilograms, metric tons, ounces, pounds, stone, US short tons, UK long tons.
Temperature: Celsius, Fahrenheit, Kelvin.
Volume: milliliters, liters, cubic meters, US teaspoons, tablespoons, fluid ounces, cups, pints, quarts and gallons, plus UK fluid ounces, pints and gallons.
Area: square millimeters, square centimeters, square meters, square kilometers, square inches, square feet, square yards, square miles, acres, hectares.
Speed: meters/second, kilometers/hour, miles/hour, knots, feet/second.
Time: milliseconds, seconds, minutes, hours, days, weeks, average months (30.44 days), years (365.25 days).
Data Storage: bits, bytes, decimal units (kB, MB, GB, TB, where 1 kB = 1,000 bytes) and binary units (KiB, MiB, GiB, TiB, where 1 KiB = 1,024 bytes).
Pressure: pascals, kilopascals, bar, psi, atmospheres, mmHg.
Energy: joules, kilojoules, calories, kilocalories (food Calories), watt-hours, kilowatt-hours, BTU.
Power: watts, kilowatts, mechanical and metric horsepower, BTU/hour.
Angle: degrees, radians, gradians, arcminutes, arcseconds.
What unit categories are supported?
Length, weight, temperature, volume, area, speed, time, data storage, pressure, energy, power, and angle are all covered in one tool.
How precise are the conversions?
Conversions use the exact defined factors (for example, 1 inch = 2.54 cm and 1 pound = 0.45359237 kg exactly) and show up to 12 significant digits. US and UK volume units and decimal (kB) and binary (KiB) data units are listed separately so you can pick the right one.
Can I convert between metric and imperial units?
Yes — that's one of the most common uses, like converting kilometers to miles or Celsius to Fahrenheit.