Convert length, weight, temperature, area, volume, speed, time and data — instantly, with every unit in the category shown at once
Length, weight & mass, temperature, area, volume, speed, time and digital data storage — covering the everyday conversions people actually need, from cm→inches to GB→GiB.
Conversions happen in your browser as you type — no page reloads, no server round-trip, and nothing you enter is sent anywhere.
Factors use the exact international definitions: 1 inch = 25.4 mm, 1 pound = 453.59237 g, 1 US gallon = 3.785411784 L — not rounded approximations.
Celsius, Fahrenheit and Kelvin aren't simple multiplications — the converter applies the proper offset formulas, so -40 °C = -40 °F comes out exactly.
The "All conversions" panel shows your value in every unit of the category simultaneously — handy when you're comparing options or double-checking a recipe.
Storage vendors count 1 KB = 1,000 bytes (decimal) while operating systems often use 1 KiB = 1,024 bytes (binary). We include both so the numbers finally add up.