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Convert between common measurement units across 12 categories — length, weight, temperature, volume, speed, time, data size, area, pressure, power, torque, and voltage. All conversions run in your browser with no server required.
m, km, cm, mm, miles, yards, feet, inches
kg, g, mg, lbs, oz, stones, tons
Celsius, Fahrenheit, Kelvin
liters, ml, gallons, quarts, pints, cups
m/s, km/h, mph, ft/s, knots
seconds, minutes, hours, days, weeks, years
bytes, KB, MB, GB, TB, PB
m², km², ft², acres, hectares
Pa, kPa, bar, psi, atm, torr
watts, kW, MW, horsepower, BTU/hr
N·m, lb·ft, lb·in, kg·m
volts, mV, kV, µV
The world uses multiple measurement systems. The metric system (SI) is standard in science and most countries, while the imperial system remains in daily use in the United States and partially in the United Kingdom. Engineers, students, and developers frequently work across both systems and need fast, reliable conversions without reaching for a calculator or memorising conversion factors.
Beyond metric and imperial, specialised fields use their own units. Network engineers think in megabits and gigabytes. Mechanical engineers work in newton-metres and pound-feet. Physicists use Kelvin instead of Celsius. These converters cover all of those cases in one place.
Length covers the full range from millimetres and centimetres through to kilometres, miles, yards, feet, and inches — useful for construction, travel distance, and manufacturing tolerances.
Weight handles kilograms, grams, milligrams, pounds, ounces, stones, and metric tonnes. The stones unit is included because it is still widely used for body weight in the UK and Ireland.
Temperature converts between Celsius, Fahrenheit, and Kelvin. The formula differs from linear scaling — Fahrenheit uses an offset of 32 — so this is one of the more error-prone conversions to do mentally.
Data size covers bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes using binary prefixes (1 KB = 1024 bytes). This is useful for storage calculations, API response size estimates, and bandwidth planning.
Pressure, power, and torque are included for mechanical and electrical engineering work. The pressure converter handles pascals, bar, psi, atmospheres, and torr. Power covers watts through to horsepower and BTU/hr. Torque handles newton-metres and pound-feet for automotive and industrial applications.
Each converter page shows two dropdowns — a source unit and a target unit — with a number input field. Type a value and the result appears immediately in the output field. Use the swap button to reverse the direction without re-entering your value.
You can also copy the output to your clipboard using the copy button next to the result. All conversions are based on exact SI conversion factors where available, and standard published factors for imperial units.
How accurate are the conversions?
Conversions use JavaScript's 64-bit floating-point arithmetic (IEEE 754 double precision), which gives 15-17 significant decimal digits of accuracy. For engineering work requiring more precision, use a dedicated engineering tool.
Why does 1 KB equal 1024 bytes and not 1000?
The data converter uses binary prefixes (1 KiB = 1024 bytes), which is how operating systems report file and storage sizes. Some drive manufacturers use decimal prefixes (1 KB = 1000 bytes), which is why a "1TB" drive shows as ~931 GB in Windows.
Can I convert between Celsius and Fahrenheit for cooking?
Yes. The temperature converter handles Celsius to Fahrenheit and back. 180°C is 356°F, 200°C is 392°F — common oven temperatures for baking.