Miles to Kilometers
Result:
Enter a length to convert.
Convert miles to kilometers. From is set to miles and To is set to kilometers. The result updates as you type. One mile is exactly 1.609344 kilometers. Other units are on the length converter. The other direction is kilometers to miles.
Miles to kilometers formula
NIST Handbook 44 (2024), Appendix C lists 1 mile = 1.609344 kilometers exactly.
Formula: kilometers = miles × 1.609344.
The converter multiplies by 1609.344 meters per mile and divides by 1000 meters per kilometer, then rounds the displayed result to five decimal places.
Example: 1 mi × 1.609344 = 1.609344 km. The converter shows 1.60934 km. Ten miles are exactly 16.09344 km and show 16.09344 km.
Miles to kilometers reference table
Each value below is the converter result at five decimal places. Enter the same miles in the form above and the result should match.
| Miles | Kilometers |
|---|---|
| 0.5 | 0.80467 |
| 1 | 1.60934 |
| 2 | 3.21869 |
| 3 | 4.82803 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 13.1 | 21.08241 |
| 26.2 | 42.16481 |
| 50 | 80.46720 |
| 100 | 160.93440 |
Miles to kilometers examples
One mile: 1 mi is exactly 1.609344 km. The converter shows 1.60934 km.
A short drive: 5 mi × 1.609344 = 8.04672 km.
Marathon rounding: 26.2 mi shows 42.16481 km. The standard marathon is 42.195 km, which the kilometers to miles page shows as 26.21876 mi, not 26.2 mi.
Quick mental math (approximation)
To estimate kilometers, multiply the miles by 1.6. Example: 5 mi × 1.6 is about 8 km. The exact result is 8.04672 km.
This shortcut is an approximation. It runs about 0.6 percent low. Use the converter or the exact formula for odometers, race results, or records.
Miles to kilometers FAQ
How many kilometers are in a mile?
One mile is exactly 1.609344 kilometers. The converter rounds that to 1.60934 km. Ten miles are exactly 16.09344 km and display as 16.09344 km.
How do I convert kilometers to miles?
Divide kilometers by 1.609344. Example: 10 km shows 6.21371 mi.
Why is a marathon not 26.2 miles on this page?
The standard marathon distance is 42.195 km, which this converter shows as 26.21876 mi. Entering 26.2 miles shows 42.16481 km, which is a little short of 42.195 km.