km to miles FREE
Convert kilometres to miles and back, with the statute mile at its exact 1609.344 m definition and the nautical mile kept as a unit of its own.
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Every conversion is calculated in this tab. Nothing is sent anywhere, which is also why the result appears as you type rather than after a round trip to a server.
Which mile, and how exact
The statute mile is 1609.344 metres exactly, so 1 km is 0.621371192237334 mi and 1 mi is 1.609344 km. The familiar 1.6 is a rounding; this page starts from the definition and lets you decide where to cut it.
The nautical mile is a different unit, 1852 metres exactly, used at sea and in the air. It gets its own row here rather than being folded into the same answer, because a distance quoted in the wrong mile is out by about 15%.
Speed is a separate category: km/h, mph, knots and metres per second are converted there. Pace, in minutes per kilometre or per mile, has its own list again, because pace is the reciprocal of a speed rather than a speed.
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