One kilometre equals exactly 0.621371192 miles (or about 0.6214 miles). To convert kilometres to miles, multiply by 0.621371 or divide by 1.609344. The kilometre is the standard road distance unit in 195 of the world's 197 countries; only the USA and UK continue to use miles for road signage, though the UK's road signs are gradually being supplemented with metric distances. Speed limits in Europe are in km/h, while the US and UK use mph. A 100 km/h speed limit equals approximately 62.14 mph.
For quick mental conversion, multiply km by 0.6 (slightly low — 96.6% accurate) or use the Fibonacci sequence trick: consecutive Fibonacci numbers approximate the miles/km ratio. 5 km ≈ 3 miles, 8 km ≈ 5 miles, 13 km ≈ 8 miles, 21 km ≈ 13 miles.
Kilometres to Miles Reference
Kilometres
Miles
Context
1 km
0.621 mi
Short drive
5 km
3.107 mi
5K race
10 km
6.214 mi
10K race
21.1 km
13.1 mi
Half marathon
42.2 km
26.2 mi
Marathon
100 km
62.14 mi
One hour at 100 km/h
1,000 km
621 mi
London to Warsaw
Kilometers to Miles for US Travel and Imports
Dividing kilometers by 1.609344 (or multiplying by 0.621371) converts to miles. International driving directions, foreign road signs, and metric GPS readings need this conversion for US drivers. A 100 km/h speed limit equals 62.1 mph. European car odometers accumulate kilometers; importing a vehicle with 80,000 km on the odometer shows approximately 49,710 miles of use. Marathon runners outside the US train in kilometers; the 42.195 km marathon equals 26.219 miles. Cycling distances in Tour de France stages are in kilometers; US cycling fans convert to miles for intuitive scale. Weather forecast wind speeds outside the US are in km/h, requiring conversion to mph for US audiences. Quick mental shortcut: multiply km by 0.6 for a rough mile estimate (about 3.5% low but sufficient for everyday navigation needs).
