Unit converter
Instantly convert length, weight, temperature, volume, speed, area and digital units. Conversion works in both directions.
Seven unit categories
Length (mm, cm, m, km, inches, feet, miles), weight (g, kg, tonnes, ounces, pounds), temperature (Celsius, Fahrenheit, Kelvin), volume (litres, gallons), speed (km/h, m/s, mph, knots), area (m², hectares, acres) and data (KB, MB, GB, KiB, MiB…).
Type a value on either side: conversion happens live, both ways.
Common examples
1 inch = 2.54 cm · 1 mile = 1.609 km · 1 pound = 453.6 g · 20 °C = 68 °F · 100 km/h = 27.8 m/s · 1 GB = 0.93 GiB.
FAQ
What is the difference between GB and GiB?
A gigabyte (GB) is 10⁹ bytes; a gibibyte (GiB) is 2³⁰ bytes (1,073,741,824). Drive makers count in GB while operating systems often display GiB.
How do I convert °C to °F in my head?
Double it and add 30 for a quick estimate (20 °C ≈ 70 °F). The exact formula is °F = °C × 9/5 + 32.
Are the conversions exact?
The factors used are official values (e.g. 1 inch = 2.54 cm exactly). Results are rounded to 8 decimal places.