Miles to km converter
Type miles or kilometers and watch both update live.
1 mi = 1.609344 km exactly, so multiply miles by 1.609344 to get kilometers.
Miles to km conversion table
| Miles | Kilometers |
|---|---|
| 1 | 1.61 |
| 2 | 3.22 |
| 3 | 4.83 |
| 4 | 6.44 |
| 5 | 8.05 |
| 6 | 9.66 |
| 7 | 11.27 |
| 8 | 12.87 |
| 9 | 14.48 |
| 10 | 16.09 |
| 13.1 | 21.08 |
| 15 | 24.14 |
| 20 | 32.19 |
| 25 | 40.23 |
| 26.2 | 42.16 |
| 30 | 48.28 |
| 40 | 64.37 |
| 50 | 80.47 |
| 60 | 96.56 |
| 70 | 112.65 |
| 80 | 128.75 |
| 90 | 144.84 |
| 100 | 160.93 |
- Live two-way conversion
- Exact to 2 decimal places
- Race distances included
How to convert miles to km
- Type a value in the miles box.
- The kilometers box updates as you type.
- Check the table for a run or drive distance.
One of the last major holdouts for the mile
Most of the world switched road distances to kilometers over the 20th century, leaving the US, and a small number of other countries, still using miles on road signs and car odometers. The mile itself was standardized by English law in 1593 at 5,280 feet, long before it had any fixed relationship to the metric system.
That relationship became exact in 1959: 1 mile equals precisely 1.609344 km, with no rounding in the factor itself.
Why the marathon distance looks inconsistent
The marathon's official distance is 42.195 km. Converted exactly, that is 26.2188 miles, which race organizers and runners round to 26.2. Neither commonly quoted number is really a round figure in the other unit, it is just where the rounding lands on each side.
A quick way to estimate without a calculator
- Multiply miles by 1.6 for a fast estimate. For 70 miles: 70 x 1.6 is 112, close to the exact 112.65 km.
- That shortcut runs a touch low since the real factor is 1.609344, but it is within about half a percent for typical driving distances.
- For a 26.2 mile marathon, the same shortcut gives 41.92, close to the official 42.195 km distance.
Miles to km FAQ
How many km is 1 mile?
1 mile equals exactly 1.609344 km.
How many km is 5 miles?
5 miles equals 8.05 km.
How many km is a marathon?
A marathon is 26.2 miles, which equals about 42.16 km.
Is the mile to km factor exact?
Yes. A mile has been defined as exactly 1.609344 km since 1959.
Why do marathon distances show as both 26.2 miles and 42.195 km?
The official marathon distance is 42.195 km. Converted precisely that is 26.2188 miles, which everyone rounds to 26.2, so the two commonly quoted figures do not convert to each other exactly.
How many km is a 70 mile road trip?
70 miles equals about 112.65 km.
Why do US road signs show miles when most of the world uses km?
The US never converted its road system to metric, so distances, speed limits and odometers still use miles, unlike almost every other country's kilometer-based signage.
How far is a 100 mile ultramarathon in km?
100 miles equals 160.93 km, a common ultra-distance race length.