Free tool
Distance converter.
Convert kilometres to miles and miles to kilometres instantly. Tap a race preset to load 5K, 10K, half, or marathon in one touch.
Kilometres and miles, converted
One mile equals 1.60934 kilometres. To convert kilometres to miles, divide by 1.60934 (or multiply by 0.621371); to convert miles to kilometres, multiply by 1.60934. The 1.6 shortcut is close enough for a quick guess, but it drifts on longer distances. Over a marathon it is off by more than 200 metres, so this converter uses the full factor.
Standard race distances are set in kilometres, which is why their mile equivalents come out to figures like 13.109 rather than a round number. Keep this table handy when you are reading a training plan in one unit and racing in the other.
Common race distances
| Race | Kilometres | Miles |
|---|---|---|
| 5K | 5 km | 3.107 mi |
| 10K | 10 km | 6.214 mi |
| Half marathon | 21.0975 km | 13.109 mi |
| Marathon | 42.195 km | 26.219 mi |
Curious about the exact 5K figure and why it is not a round number? Read how many miles a 5K is, or turn a step count into distance with the steps to miles calculator.
Frequently asked
How do you convert kilometres to miles?
Divide the number of kilometres by 1.60934, or multiply by 0.621371. For example, 10 km is 10 divided by 1.60934, which is about 6.21 miles. To go the other way, multiply miles by 1.60934 to get kilometres. This converter does both directions instantly.
How many miles is a 5K, 10K, half marathon, and marathon?
A 5K is 3.107 miles, a 10K is 6.214 miles, a half marathon (21.0975 km) is 13.109 miles, and a full marathon (42.195 km) is 26.219 miles. Tap any of the race presets above to load the exact figure and see it converted.
Is 1 mile exactly 1.6 km?
Not exactly. One mile is 1.60934 kilometres, so 1.6 works as a rough shortcut but it drifts over longer distances. Over a marathon, the difference between 1.6 and 1.60934 adds up to more than 200 metres, so this converter uses the full factor.
Why do race distances use kilometres?
Most official road races are measured and certified in kilometres because the metric system is the international standard for athletics. The mile equivalents are exact conversions of those metric distances, which is why they come out to awkward figures like 13.109 rather than a round number.
How do I train for one of these distances?
Knowing the distance is the easy part. Covering it well takes a plan that builds your endurance and speed week by week. Gritup generates an adaptive plan for your goal race, whether that is your first 5K or a marathon, and reshapes it around your real life.
Distance into a plan
Know the distance. Now go train for it.
Gritup turns any goal distance into a periodised, week-by-week training plan that adapts when life gets in the way. Run, bike, swim, or all three.