U2C.app

U2C.app converts measurements across 60 categories and 580 units: length, area, volume, weight, temperature, time, speed, data, pressure, energy, power, force, torque, angle, frequency, density, viscosity, flow, electricity, light, radiation, sound and more. Special converters cover time zones, shoe and ring sizes, wire and sheet-metal gauges, drill bits and needle gauges, 64 cooking ingredients by weight, decibels, pH, number bases and Roman numerals.

Type a plain query such as 10 km to mi in the smart search, or pick a category. Every conversion shows the exact formula and the full-precision result, calculated with exact arithmetic, with its accuracy and the standards it is based on. Choose decimal, scientific or engineering notation, keep favourite units and recent conversions, and copy or share results.

Free, no sign-up, calculations run in your browser. 37 languages.