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mm, cm, m, km, inch, foot, mile.
The length converter changes a distance from one unit to another — metric (mm, cm, m, km) and imperial/US (inch, foot, yard, mile) — instantly as you type.
Every unit is defined by an exact factor: how many metres it equals. The tool converts your value to metres first, then to the target unit, so results are accurate in both directions.
Exact definitions: 1 in = 0.0254 m, 1 ft = 0.3048 m, 1 yd = 0.9144 m, 1 mi = 1609.344 m.
There is no metric foot. The international foot used here is exactly 0.3048 m and is standard in both the US and UK for everyday measurement.
Exactly 2.54 cm, because 1 inch = 25.4 mm by definition.
Using a single base unit (the metre) keeps every conversion consistent and avoids rounding errors that pile up when converting unit-to-unit directly.