Miles to kilometers
km = mi × 1.609344
Exact factor, from 1 mi = 1,760 yd and 1 yd = 0.9144 m.
Kilometers to miles converter (and miles to km)
Two-way kilometers ↔ miles converter: exact factor (1 mile = 1.609344 km), formulas, a mental-math shortcut, a conversion table and real examples (5K and marathon distances, speed limits, EV range).
Conversion table
| km | mi |
|---|---|
| 1 km | 0.6214 mi |
| 2 km | 1.24274 mi |
| 5 km | 3.10686 mi |
| 10 km | 6.21371 mi |
| 20 km | 12.4274 mi |
| 50 km | 31.0686 mi |
| 100 km | 62.1371 mi |
| 1,000 km | 621.371 mi |
| mi | km |
|---|---|
| 1 mi | 1.60934 km |
| 2 mi | 3.21869 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.0934 km |
| 20 mi | 32.1869 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.934 km |
| 1,000 mi | 1,609.34 km |
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How does this tool work?
This converter turns kilometers into miles and miles into kilometers: type a value in either field and the other one updates instantly. Use it to understand a race distance given in km, a road sign or speed limit abroad, a car's range quoted in the other unit, or a distance mentioned in a European travel guide.
The mile used here is the international statute mile, fixed by the 1959 international yard and pound agreement: 1 mile = 1,760 yards = 1,609.344 meters exactly. It follows that 1 km ≈ 0.621371 mile.
To go from kilometers to miles, divide by 1.609344 (or multiply by 0.621371); to go from miles to kilometers, multiply by 1.609344. Both fields stay in sync, and the double arrow swaps the direction without losing the value you entered.
For a quick estimate, multiply kilometers by 6 and divide by 10: 50 km ≈ 30 miles (exact value 31.07). The other way, add 60% to the miles: 10 miles ≈ 16 km. Consecutive Fibonacci numbers also make handy pairs: 5 miles ≈ 8 km, 8 miles ≈ 13 km.
Don't confuse the statute mile with the nautical mile used at sea and in aviation, which is exactly 1,852 m. The US survey mile, very slightly longer, has been officially retired since 2023.
How to use this tool
Enter a distance
Use the Kilometers field or the Miles field; decimals are accepted, so 21.0975 km works fine.
Read the result
The other field recalculates on every keystroke, with no button to press.
Swap or scan the table
The double arrow flips the units; the table below the converter lists common values in both directions.
Km ↔ miles conversion formulas
The international mile is defined exactly in terms of the meter.
Kilometers to miles
mi = km ÷ 1.609344 ≈ km × 0.621371
The 0.621371 factor is rounded to the millionth.
- km
- distance in kilometers (1 km = 1,000 m)
- mi
- distance in international miles (1 mi = 1,760 yd)
Example: 5 km = 5 ÷ 1.609344 ≈ 3.107 miles.
Use cases
Travel in Europe or Canada
Read distance signs and speed limits, which are given in kilometers and km/h almost everywhere outside the US and UK.
Running and cycling
Translate 5K, 10K, half marathon or gran fondo distances and training plans between km and miles.
Cars and EVs
Compare range, mileage or fuel economy figures from spec sheets that use the other system.
Reading and translation
Make sense of a distance quoted in a foreign article, book or film.
Examples
5K race
5 ÷ 1.609344 ≈ 3.107 miles, the classic parkrun distance.
Input
5 kmResult
3.11 milesMarathon
The official marathon distance, usually quoted as 26.2 miles.
Input
42.195 kmResult
26.22 milesEuropean speed limit
The French and Italian motorway limit of 130 km/h is about 81 mph.
Input
130 km (per hour)Result
80.78 milesElectric car range
A WLTP range of 500 km, as printed on European spec sheets, is about 311 miles.
Input
500 kmResult
310.69 milesRoad trip leg
60 × 1.609344 = 96.56 km, roughly an hour on a US interstate.
Input
60 milesResult
96.56 kmTips and best practices
- Quick reference: 1 mile ≈ 1.6 km and 1 km ≈ 0.62 mile.
- Speeds convert with the same factor: 1 mph = 1.609344 km/h; a dedicated km/h ↔ mph converter is also available.
- At sea or in the air, distances are in nautical miles (1,852 m), not statute miles.
- To check a result, convert it back the other way: you should land on your starting value.
Sources and references
- NIST, Guide for the Use of the International System of Units (SP 811), Appendix B.8: Factors for Units Listed Alphabetically (opens in a new tab)Page in English
- BIPM, The International System of Units (SI Brochure) (opens in a new tab), Bureau international des poids et mesuresPage in English
Frequently asked questions
How many kilometers are in a mile?
One mile is exactly 1.609344 km, or 1,609.344 meters. This value was fixed by the 1959 international yard and pound agreement.
How do I convert km to miles?
Divide the kilometers by 1.609344, or multiply them by 0.621371. For example, 10 km is about 6.21 miles.
How do I convert miles to km?
Multiply the miles by 1.609344. For example, 26.2 miles is about 42.16 km, and 100 miles is 160.93 km.
What is the difference between a mile and a nautical mile?
A statute mile is 1,609.344 m; a nautical mile, used in sea and air navigation, is 1,852 m. A speed in knots means nautical miles per hour.
How can I convert km to miles in my head?
Multiply by 0.6: 80 km ≈ 48 miles (exact value 49.7). For miles to km, multiply by 1.6: 25 miles ≈ 40 km.
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