Miles to Kilometers Converter
Convert miles to kilometers instantly and back. Uses the exact 1.609344 km per mile factor, with worked examples, a running and driving chart and common mi to km conversions.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Miles to Kilometers Converter Works
This converter switches between miles (mi) and kilometers (km) in both directions, using the exact factor of 1.609344 km per mile. Type a value, pick the direction, and the result updates live with the steps shown.
The Formula
Kilometers = miles × 1.609344
The mile here is the international (statute) mile used for road distance. To convert kilometers back to miles, divide by 1.609344 (or multiply by about 0.621371).
Worked Example
Convert 26.2 miles to kilometers:
- 26.2 × 1.609344 = 42.16 km
Convert 10 kilometers to miles:
- 10 ÷ 1.609344 = 6.21 miles
Running and Driving Chart
| Miles | Kilometers |
|---|---|
| 1 | 1.61 |
| 3.1 (5K) | 5.00 |
| 6.2 (10K) | 9.98 |
| 13.1 (half) | 21.08 |
| 26.2 (marathon) | 42.16 |
The Quick Mental Shortcut
For a fast estimate, multiply miles by 1.6 to get kilometers, or multiply kilometers by 0.6 to get miles. This is accurate to within about 1%, fine for travel and running. For official race distances and surveying, use the exact 1.609344 factor.
Frequently asked questions
How many kilometers are in a mile?+
One mile equals exactly 1.609344 kilometers. So 1 km is about 0.621371 miles, just under two-thirds of a mile.
How do I convert miles to kilometers?+
Multiply the number of miles by 1.609344. For example, 26.2 miles × 1.609344 = 42.16 km, the length of a marathon. To reverse it, divide kilometers by the same factor.
How many km is 5 miles?+
5 miles equals about 8.05 kilometers. Multiply 5 by 1.609344 to get the precise value of 8.047 km.
What is the quick mental shortcut for miles to km?+
Multiply miles by 1.6, or add about 60%. For example, 10 miles ≈ 16 km. For km to miles, multiply by 0.6 as a rough estimate.
How long is a marathon in kilometers?+
A marathon is 26.2 miles, which equals about 42.16 kilometers (officially 42.195 km). Multiply 26.2 by 1.609344 to see how the standard distance lines up.