KM to Miles
Convert kilometres to miles — 1 km is 0.6214 miles. With the halve-plus-a-bit rule and race distances.
Fast, easy and free — your answer appears as you type, and whatever you enter stays on your device.
One kilometre is 0.6214 miles — multiply kilometres by 0.62, or roughly halve and add a quarter of the half. Type a distance below for the exact figure, or check the table for running-race and road-trip distances.
How to use it
- Type the kilometre valueThe mile answer appears as you type — no button to press.
- Or go the other waySwap flips the direction to mile → kilometre in one tap.
- Check the workingThe exact factor or formula used is shown beneath the answer, so the result is checkable, not just asserted.
Kilometres in miles, race distances included
| km | mi |
|---|---|
| 1 km | 0.621 mi |
| 5 km | 3.107 mi |
| 10 km | 6.214 mi |
| 21.1 km | 13.11 mi |
| 42.2 km | 26.22 mi |
| 50 km | 31.07 mi |
| 100 km | 62.14 mi |
The quick rule for your head
The runner's rule: halve the kilometres, then add a quarter of what you halved. 10 km → 5 + 1.25 ≈ 6.2 miles (exact: 6.21). The elegant nerd option: consecutive Fibonacci numbers approximate the ratio — 5 km ≈ 3 miles, 8 km ≈ 5 miles, 13 km ≈ 8 miles — accurate to within half a percent, by pure coincidence of mathematics.
Where this conversion shows up
Driving abroad is the classic case — road signs in km against a mental map in miles — followed closely by running: parkruns and 10Ks are metric, but pace watches and old training plans often speak miles. A marathon is the crossover artefact itself: 42.195 km because it was first measured as 26 miles 385 yards.
Need other units too? The fulllength converter handles every pair and shows the exact factor behind each answer. For the opposite direction, use Miles to KM.
Questions people ask
How many miles is 5 km?
3.11 miles — the parkrun distance. A 10 km run is 6.21 miles, and a half marathon (21.1 km) is 13.1 miles.
How fast is 100 km/h in miles per hour?
62 mph. Speed converts with the same factor as distance — our km/h to mph page covers the driving cases with a speed-specific table.
Why 0.6214 exactly?
Because the mile is defined as exactly 1,609.344 metres, the factor is 1000 ÷ 1609.344 = 0.62137119… — exact as a definition, endless as a decimal.
Which countries still use miles on roads?
The UK and the US are the big two, plus a handful including Liberia and Myanmar. Nearly everywhere else signs kilometres, which is why rental-car dashboards abroad are the birthplace of this conversion.