The global unit conversion hub

Convert between meters, feet, inches, miles, kilometers, and dozens of other length units used worldwide.

Switch between kilograms, pounds, ounces, stones and grams with NIST-exact factors.

Celsius, Fahrenheit, Kelvin and Rankine — with the right offset, not just a multiplier.

Liters, gallons (US & Imperial), cups, fluid ounces, tablespoons and dozens more.

Square meters, square feet, acres, hectares and more.

Mph, km/h, knots, m/s — including the speed of light.

PSI, bar, kPa, atm, mmHg — everything for tires, weather and engineering.

Joules, calories, kJ, kWh, BTU and electronvolts.

Watts, kilowatts, horsepower (mechanical and metric), BTU/h.

N·m, lb·ft, lb·in — for engines, bolts and tools.

Convert MPG (US & Imperial), L/100 km and km/L with the NIST reciprocal formula.

Bytes, kilobytes (decimal) and kibibytes (binary) — the difference that engineers care about.

Mbit/s vs MB/s — internet speed advertising vs actual download display.

Seconds, minutes, hours, days — with Julian-year and decade conversions.

Degrees, radians, gradians, arcminutes, arcseconds.

Hz, kHz, MHz, GHz and RPM for engines and electronics.

Cups, tablespoons, teaspoons, grams and milliliters — ingredient-aware for accurate recipes.