About

FreeUnitConvertor is a free unit converter. It covers 17 kinds of measurement, from length and weight to data storage and fuel economy, plus cooking, height and fitness conversions.

How the numbers are worked out

Every unit is defined as an exact multiple of one base unit per category, using the official definition wherever there is one: the international inch (exactly 2.54 cm), the international pound (exactly 0.45359237 kg), the US gallon (exactly 231 cubic inches) and the imperial gallon (exactly 4.54609 L). Temperatures use the exact offsets between scales. Results are rounded for display only.

Cooking weights are averages for spooned and leveled US cups. They are good for following a recipe, but a kitchen scale is always more accurate.

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