How to convert units
- Pick what you're measuring: length, weight, temperature, volume, area, speed or data size.
- Enter a value and choose the units to convert from and to.
- Use the swap button to flip the direction.
- Open “every unit” to see the value in all units at once.
Common conversions
| From | To | Multiply by |
|---|---|---|
| Inches | Centimetres | 2.54 (exact) |
| Feet | Metres | 0.3048 (exact) |
| Miles | Kilometres | 1.609344 (exact) |
| Pounds | Kilograms | 0.45359237 (exact) |
| Ounces | Grams | 28.349523125 (exact) |
| US gallons | Litres | 3.785411784 (exact) |
| Miles per hour | Kilometres per hour | 1.609344 (exact) |
| Acres | Square metres | 4,046.8564224 (exact) |
Temperature formulas
- Celsius to Fahrenheit: °F = °C × 9/5 + 32
- Fahrenheit to Celsius: °C = (°F − 32) × 5/9
- Celsius to Kelvin: K = °C + 273.15
−40 is the one temperature that reads the same in Celsius and Fahrenheit.
Common uses
- Following a recipe from abroad. Convert cups, tablespoons and fluid ounces in a US recipe to millilitres, ounces to grams, and oven temperatures from Fahrenheit to Celsius.
- Driving in another country. Convert speed limits between mph and km/h, and road distances between miles and kilometres, before you set off.
- Comparing storage and data plans. Convert between MB, GB and GiB to compare file sizes, cloud storage plans and mobile data allowances like for like.
- Height and weight on a form. A form may ask for height in feet and inches or weight in stone or kilograms. Convert your measurements to the units it asks for.