EN

km to miles and miles to km converter

km to miles in one step: 1 kilometer is 0.6214 mile, so 10 km = 6.214 mi. Enter kilometers and see miles while you type, with the share of a marathon for running distances. Miles to km works in the same box: 1 mile = 1.609344 km.

Example: Distance 10 · Direction: km to miles (km → mi) → Answer: 10 km = 6.214 mi. Source: NIST SP 811, Appendix B.8 – mile (statute) = 1.609344 km (exact, 5,280 international feet). Updated: .

My ToolboxYour inputs are saved in this browser only.

Result

Answer
10 km = 6.214 mi
As a running distance
That distance is 23.7 % of a marathon (42.195 km).
Working
10 km ÷ 1.609344 = 6.214 mi
Quick check in your head
10 × 5 ÷ 8 ≈ 6.3 mi (exact: 6.214 mi). Multiply by 5 and divide by 8; the result is about 0.6 % high.
Conversion chart
kmmi
10.6214
21.243
31.864
42.485
53.107
106.214
159.321
2012.427
2515.534
3018.641
4024.855
5031.069
6037.282
8049.71
10062.137
15093.206
200124.274
300186.411
500310.686
1,000621.371
Distances worth knowing
Distancekmmi
5K race53.107
10K race106.214
Half marathon (21.0975 km)21.09813.109
Marathon (42.195 km)42.19526.219
50 km/h, urban speed limit in many countries5031.069
100 km/h, rural road speed10062.137
130 km/h, advisory speed on the German Autobahn13080.778
One international mile is defined as exactly 1.609344 km (5,280 feet), so miles to km is exact; km to miles is rounded for display. This page uses the statute mile, not the nautical mile (1.852 km).

How it is calculated

How to convert km to miles

miles = kilometers ÷ 1.609344, or kilometers × 0.621371. For 10 km: 10 ÷ 1.609344 = 6.214 mi. Going back, kilometers = miles × 1.609344: 26.2 mi × 1.609344 = 42.165 km. The factor 1.609344 is exact: the international mile has been 1,609.344 m since 1959, which is 5,280 feet.

Race distances in km and miles

Road races are measured in kilometers, results are often quoted in miles in the US and UK. A 5K is 3.107 mi, a 10K is 6.214 mi, a half marathon (21.0975 km) is 13.109 mi and the marathon (42.195 km) is 26.219 mi – the 26.2 on a bumper sticker. The line under the answer tells you which share of a marathon your distance is: 10 km is 23.7 %.

Speed signs: the same number, a different speed

Speeds convert with exactly the same factor, so km/h to mph is the same sum. A 100 km/h limit is 62.137 mph, 130 km/h is 80.778 mph, and 50 km/h is 31.069 mph. A 65 mph US limit is 104.607 km/h. For speed units alone see the km/h to mph converter.

A quick mental trick

Multiply kilometers by 5 and divide by 8: 80 km × 5 = 400, ÷ 8 = 50 mi (exact: 49.71 mi). Going back multiply miles by 1.6, or add half of the miles and 10 % of the miles: 50 mi ≈ 80 km (exact: 80.467 km). Do not use this page for sea or air distances, which are measured in nautical miles (1.852 km).

For other units see the length converter, for pace per mile or km the running pace calculator.

Frequently asked questions

How many miles is 1 km?

1 kilometer is 0.621371 mile, rounded 0.6214 mi. 5 km is 3.107 mi and 100 km is 62.137 mi.

How do I convert km to miles?

Divide the kilometers by 1.609344 or multiply by 0.621371. Example: 10 km × 0.621371 = 6.214 mi.

How many km is a mile?

1 mile is exactly 1.609344 km. A 26.2 mile marathon is 42.165 km, and the official marathon distance is 42.195 km (26.219 mi).

How many miles is a 10K?

A 10K is 6.214 miles, and a 5K is 3.107 miles.

How do I convert km to miles in my head?

Multiply by 5 and divide by 8. 40 km × 5 ÷ 8 = 25 mi (exact: 24.855 mi).

Sources and legal basis

As of: · Editorial policy

Related tools