Unit converter
Convert length, mass, temperature, volume, area, speed, time and data — m, km, mi, ft, in, kg, lb, oz, °C, °F, K, L, gal, ha, acre, km/h, mph, knots, MB, GiB and more.
Related tools
All Units & measures tools →Every unit this converter handles
53 units across 8 quantities — 324 possible conversions, all free and instant.
Length
| Unit | Symbol | Equals |
|---|---|---|
| Metre | m | — |
| Kilometre | km | 1,000 m |
| Centimetre | cm | 0.01 m |
| Millimetre | mm | 0.001 m |
| Mile | mi | 1,609.344 m |
| Yard | yd | 0.9144 m |
| Foot | ft | 0.3048 m |
| Inch | in | 0.0254 m |
| Nautical mile | nmi | 1,852 m |
Mass
| Unit | Symbol | Equals |
|---|---|---|
| Kilogram | kg | — |
| Tonne | t | 1,000 kg |
| Gram | g | 0.001 kg |
| Milligram | mg | 1e-6 kg |
| Pound | lb | 0.45359237 kg |
| Ounce | oz | 0.02834952313 kg |
| Stone | st | 6.35029318 kg |
Temperature
| Unit | Symbol | Equals |
|---|---|---|
| Celsius | C | — |
| Fahrenheit | F | — |
| Kelvin | K | — |
Temperature scales are offset, not just scaled, so there is no single factor: 0 °C is 273.15 K and 32 °F.
Volume
| Unit | Symbol | Equals |
|---|---|---|
| Litre | L | — |
| Millilitre | mL | 0.001 L |
| Cubic metre | m3 | 1,000 L |
| Gallon (US) | gal | 3.785411784 L |
| Quart (US) | qt | 0.946352946 L |
| Pint (US) | pt | 0.473176473 L |
| Fluid ounce (US) | fl oz | 0.02957352956 L |
Area
| Unit | Symbol | Equals |
|---|---|---|
| Square metre | m² | — |
| Square kilometre | km² | 1,000,000 m² |
| Square centimetre | cm² | 0.0001 m² |
| Hectare | ha | 10,000 m² |
| Are | a | 100 m² |
| Square foot | ft² | 0.09290304 m² |
| Square yard | yd² | 0.83612736 m² |
| Acre | ac | 4,046.856422 m² |
Speed
| Unit | Symbol | Equals |
|---|---|---|
| Metre per second | m/s | — |
| Kilometre per hour | km/h | 0.2777777778 m/s |
| Mile per hour | mph | 0.44704 m/s |
| Knot | kn | 0.5144444444 m/s |
| Foot per second | ft/s | 0.3048 m/s |
Time
| Unit | Symbol | Equals |
|---|---|---|
| Second | s | — |
| Millisecond | ms | 0.001 s |
| Minute | min | 60 s |
| Hour | h | 3,600 s |
| Day | d | 86,400 s |
| Week | wk | 604,800 s |
Data
| Unit | Symbol | Equals |
|---|---|---|
| Byte | B | — |
| Kilobyte | kB | 1,000 B |
| Megabyte | MB | 1,000,000 B |
| Gigabyte | GB | 1e+9 B |
| Terabyte | TB | 1e+12 B |
| Kibibyte | KiB | 1,024 B |
| Mebibyte | MiB | 1,048,576 B |
| Gibibyte | GiB | 1.074e+9 B |
Unit converter is free to use as often as you like, directly from this page. It sits under Units & measures in our catalogue, alongside Unit price calculator and Angle converter.
How to use it
- Open the tool — no signup or install needed.
- Enter your input or adjust the available options.
- Get your result instantly, then copy or download it.
Frequently asked questions
What does Unit converter do?
Convert length, mass, temperature, volume, area, speed, time and data — m, km, mi, ft, in, kg, lb, oz, °C, °F, K, L, gal, ha, acre, km/h, mph, knots, MB, GiB and more.
When would I actually use this?
Reading a figure written in units you don't work in: a recipe in Fahrenheit, a spec sheet in inches, a fuel figure in miles per gallon, a bandwidth in megabits.
What is the most common mistake?
Assuming a unit name means one thing. A US gallon is four fifths of an imperial one, a US pint is smaller than a UK pint, and a megabyte is 1000 or 1024 kilobytes depending on who wrote the spec.
What else is filed next to it?
Unit price calculator, Angle converter and Area converter share its section. They are not variants of it — being filed together is not the same as being alike — but that is where to look if this turned out not to be the tool you wanted.
Where do the figures come from?
Factors are the SI-defined ones where a definition exists, and the tool names the variant it uses wherever a unit has more than one. Conversion happens at full precision and is rounded only for display.