Unit converter
This free unit converter changes length, weight and temperature from one unit to another. Choose a category, the source and target units, enter a value, and the result appears instantly. It's handy for quick conversions between metric and imperial units.
How the calculation works
For length and weight, each unit's ratio to a base unit (metre, gram) is stored; the value is converted first to the base and then to the target unit. Temperature is handled separately with the standard formulas between Celsius, Fahrenheit and Kelvin. Everything runs in your browser.
Worked example
10 kilometres is 6.21 miles. 5 kilograms equals 11.02 pounds. 25 °C is 77 °F. The result appears instantly for any pair of units.
Frequently asked questions
Which units are supported?
Length (km, m, cm, mm, mile, foot, inch), weight (tonne, kg, g, lb, oz) and temperature (°C, °F, K).
How is temperature converted?
With the standard formulas between Celsius, Fahrenheit and Kelvin.
Is the result accurate?
Yes, using standard conversion factors.
Is the tool free?
Yes — completely free.