Convert miles to kilometres
1 mi = 1.61 km. Type any value below for an instant conversion.
1 mi = 1.61 km
Formula
km = mi × 1.609344Worked example: 13.1 mi × 1.609344 = 21.08 km
A half marathon is 13.1 miles or 21.1 km, and a full marathon 26.2 miles or 42.2 km. The ratio is close to the golden ratio, so successive Fibonacci numbers approximate the conversion — 5 miles is about 8 km, 8 miles about 13 km.
miles to kilometres conversion table
| miles (mi) | kilometres (km) |
|---|---|
| 1 mi | 1.61 km |
| 2 mi | 3.22 km |
| 3 mi | 4.83 km |
| 5 mi | 8.05 km |
| 10 mi | 16.09 km |
| 13.1 mi | 21.08 km |
| 26.2 mi | 42.16 km |
| 50 mi | 80.47 km |
| 60 mi | 96.56 km |
| 100 mi | 160.93 km |
Frequently asked questions
How many kilometres are in one mile?
One mile equals 1.61 kilometres.
How do I convert miles to kilometres?
Multiply the number of miles by 1.609344. For example, 13.1 mi × 1.609344 = 21.08 km.
Is this mi to km conversion exact?
The conversion factor of 1.609344 is used at full floating-point precision and rounded only for display, so the result is accurate for scientific, engineering and everyday use.
What is the reverse conversion?
To go the other way, use the km to mi converter. The reverse factor is 0.6213711922.
Related length conversions
Need something else? The full unit converter covers length, weight, temperature, volume, speed and data storage.