Unit Converter
Convert between units of length, weight, temperature, volume, and more.
How It Works
Select a measurement category (length, mass, temperature, volume, area, speed, etc.), enter the value, and choose source and target units. Convert instantly.
**Unit Converter — Convert Any Measurement Instantly**
From centimetres to inches to metres to feet, from kilograms to pounds to ounces, our Unit Converter handles all common unit conversions across every major measurement category.
**Measurement Categories**
**Length**
Millimetre, centimetre, metre, kilometre, inch, foot, yard, mile, nautical mile, light-year, parsec
**Mass / Weight**
Milligram, gram, kilogram, tonne, ounce, pound, stone, US ton, metric ton
**Temperature**
Celsius (°C), Fahrenheit (°F), Kelvin (K)
- °F = (°C × 9/5) + 32
- K = °C + 273.15
**Volume**
Millilitre, litre, cubic metre, teaspoon (US), tablespoon (US), fluid ounce, cup (US), pint, quart, gallon (US/UK)
**Area**
Mm², cm², m², km², in², ft², yd², acre, hectare, mi²
**Speed**
m/s, km/h, mph, knots, feet per second, Mach number
**Data Storage**
Bits, bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes
**Time**
Milliseconds, seconds, minutes, hours, days, weeks, months, years
**Energy**
Joules, kilojoules, kilowatt-hours, calories, kilocalories, BTU
**Pressure**
Pascal, kilopascal, megapascal, bar, psi, atm, mmHg
**Common Conversion Factors to Know**
- 1 inch = 2.54 cm
- 1 kg = 2.20462 lbs
- 1 mile = 1.60934 km
- 1 litre = 0.264172 US gallons
- 1 acre = 0.404686 hectares
- 0°C = 32°F = 273.15K
**Why Unit Conversion Matters**
Science and engineering require precise unit conversions. NASA lost the Mars Climate Orbiter in 1999 due to a unit conversion error — one team used imperial units, another metric. Unit conversion errors have caused aircraft to run out of fuel mid-flight and bridges to be built at the wrong scale.