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Type a value, pick the units — every conversion updates live.
Every unit is defined in meters (1 inch = 0.0254 m exactly, 1 foot = 0.3048 m, 1 mile = 1609.344 m). Converting means dividing out the source unit and multiplying into each target — no lookup tables, no rounding drift. Worked example: 1 mile = 1609.344 m = 1.60934 km.
Exactly 2.54 cm per inch — this is an international definition, not a measurement.
3.28084 feet. A quick estimate: a meter is about 3 ft 3 in.
Customary units persist in construction and everyday life in the US, while science, medicine and most of the world use metric. Converters like this bridge the two.