Convert kilometres to miles
1 km = 0.621371 mi
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How many miles are in a kilometre?
One kilometre is 0.621371192 miles. To convert any amount, multiply by 0.621371192. Going the other way, one mile is 1.609344 kilometres.
What is the formula to convert km to mi?
Multiply the kilometre figure by 0.621371192. So mi = km × 0.621371192. For a quick mental estimate, dividing by about 1.61 gets you close enough for most everyday purposes.
What does a kilometre actually look like?
One kilometre is about a 12-minute walk. The kilometre is the standard road-distance unit everywhere except the United States, the United Kingdom and a handful of small territories.
And what is a mile?
One mile is a comfortable 20-minute walk. The statute mile is exactly 1,609.344 metres, a consequence of the inch being fixed at 25.4 mm in 1959. It remains the road unit in the US and UK.
Is this conversion exact?
Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding km before converting introduces an error the conversion then multiplies.
About km to mi
How to convert kilometres to miles
Multiply by 0.621371192. One kilometre is 0.621371192 miles, and one mile is 1.609344 kilometres.
mi = km × 0.621371192
Worked example
10 km = 6.213712 mi. For a sense of scale, one kilometre is about a 12-minute walk, and one mile is a comfortable 20-minute walk.
About the kilometre
The kilometre is the standard road-distance unit everywhere except the United States, the United Kingdom and a handful of small territories.
About the mile
The statute mile is exactly 1,609.344 metres, a consequence of the inch being fixed at 25.4 mm in 1959. It remains the road unit in the US and UK.
Quick reference
| kilometres | miles |
|---|---|
| 1 km | 0.621371 mi |
| 2 km | 1.24274 mi |
| 5 km | 3.10686 mi |
| 10 km | 6.21371 mi |
| 25 km | 15.5343 mi |
| 50 km | 31.0686 mi |
| 100 km | 62.1371 mi |
| 1000 km | 621.371 mi |
Getting it right
This conversion is exact by definition, so the only limit on accuracy is how many digits you keep. Round at the end rather than partway through — rounding km to a whole number before converting introduces an error that the conversion then multiplies.
Other length conversions
Convert miles back to kilometres, or pick any other pair with the full unit converter. Related: km to m, km to cm, km to mm.