Choose compatible units
Select units that measure the same quantity, such as kilometres to miles, kilograms to pounds or square metres to square feet. A length cannot be converted directly into a mass or an area.
Temperature conversion uses an offset as well as a scale factor. For example, 0°C equals 32°F. The gallon option means US liquid gallons, so choose a different method if you need Imperial gallons.
What is this calculator?
Convert compatible length, mass, temperature, volume and area units.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Convert compatible length, mass, temperature, volume and area units.
How to use it
- Enter value.
- Enter from unit.
- Enter to unit.
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
Most units use a common base. Temperature uses an offset formula, for example °C = (°F − 32) × 5/9.
Worked example
Value: 10, From unit: km, To unit: miles. The result is 6.21371192 miles (converted value).
Assumptions and limits
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.
Frequently asked questions
What inputs does the Unit Converter need?
Use value, from unit, to unit. Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Unit Converter?
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.