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Length and mass use a conversion factor through metres and kilograms. Temperature needs both a scale and an offset. Pounds use the international avoirdupois definition; ounces are units of mass, not fluid ounces.
Frequently asked questions
What units are supported?
Millimetres, centimetres, metres, kilometres, inches, feet and miles; grams, kilograms, ounces and pounds; Celsius, Fahrenheit and Kelvin.
Is this tool free?
Yes. There is no account, payment or software download required to use this tool.