Convert miles to kilometres

One mile is 1.609344 kilometres. To convert any amount, multiply by 1.609344. Going the other way, one kilometre is 0.621371192 miles.

Multiply the mile figure by 1.609344. So km = mi × 1.609344. For a quick mental estimate, multiplying by about 1.61 gets you within a percent or so, which is close enough for most everyday purposes.

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.

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.

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 mi before converting introduces an error the conversion then multiplies.