Unit Conversion Calculator

What the Unit Conversion Calculator does

Every unit in a category converts through a base unit: metres for length, kilograms for mass, litres for volume and so on, using exact defined factors such as 1 inch = 2.54 cm and 1 lb = 0.45359237 kg. Temperature is the exception, because its scales have different zero points.

It also works as a unit converter or a metric to imperial converter.

Formula

• Result = value × factor(from) ÷ factor(to)
• °F = °C × 9/5 + 32; K = °C + 273.15
• 1 in = 2.54 cm exactly; 1 lb = 0.45359237 kg exactly

Worked example

Using the starting values in the calculator above:

How to read the result

US and imperial gallons, pints and fluid ounces differ; a UK pint is about 20% larger than a US pint.

Storage makers use decimal units (1 GB = 10⁹ bytes); operating systems often show binary units (GiB).

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