Miles to Kilometers Converter
Convert miles to kilometers and back. 1 mile = 1.609344 kilometers exactly.
Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.
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Miles and Kilometers
One mile is exactly 1.609344 kilometers, and one kilometer is about 0.621371192237 miles. The converter works both ways: use the two tabs at the top of the tool to choose the direction.
Quick conversion table
Miles to Kilometers
| Miles | Kilometers |
|---|---|
| 1 mi | 1.609344 km |
| 2 mi | 3.218688 km |
| 3 mi | 4.828032 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.09344 km |
| 15 mi | 24.14016 km |
| 20 mi | 32.18688 km |
| 25 mi | 40.2336 km |
| 26.2 mi | 42.164813 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.9344 km |
| 500 mi | 804.672 km |
Kilometers to Miles
| Kilometers | Miles |
|---|---|
| 1 km | 0.62137119 mi |
| 2 km | 1.2427424 mi |
| 5 km | 3.106856 mi |
| 10 km | 6.2137119 mi |
| 20 km | 12.427424 mi |
| 42.195 km | 26.218757 mi |
| 50 km | 31.06856 mi |
| 100 km | 62.137119 mi |
| 200 km | 124.27424 mi |
| 500 km | 310.6856 mi |
Exact factor and source
| Conversion | Value | Basis |
|---|---|---|
| 1 mile in kilometers | 1.609344 | exact. NIST SP 811 (2008), Appendix B.8: 1 mi = 1609.344 m exactly (5,280 ft x 0.3048 m) |
| 1 kilometer in miles | 0.621371192237 | rounded to 12 digits. SI Brochure, 9th edition (BIPM 2019): SI prefix kilo = 10^3 |
How to convert miles to kilometers
- Step oneTake the number of miles.
- Step twoMultiply it by 1.609344.
- Step threeThe result is the number of kilometers.
- Step fourTo go back, divide by 1.609344, or multiply by 0.621371192237.
Example: 10 mi x 1.609344 = 16.09344 km.
All length units compared
Each unit written in meters, the base unit of this tool. Exact values come straight from the definitions.
| Unit | Symbol | Value in meters |
|---|---|---|
| Millimeters | mm | 0.001 meters |
| Centimeters | cm | 0.01 meters |
| Meters | m | 1 meter |
| Kilometers | km | 1,000 meters |
| Inches | in | 0.0254 meters |
| Feet | ft | 0.3048 meters |
| Yards | yd | 0.9144 meters |
| Miles | mi | 1,609.344 meters |
What is a mile?
The mile (mi) is the road-distance unit of the United States and the UK. One international mile is exactly 1,609.344 meters, which is 5,280 feet.
What is a kilometer?
The kilometer (km) is 1,000 meters and equals 0.621371192237 miles. Road signs and race distances use it in most of the world.
What this converter does not do
- Results are rounded for display to 8 significant digits; the stored factor is the exact one.
- It uses the international foot (exactly 0.3048 m), not the older US survey foot.
- It converts lengths only; it does not convert between a length and a time, a pace or an area.
Frequently asked questions
How many kilometers are in a mile?
1 mile is exactly 1.609344 kilometers. That factor is exact by definition.
How many miles are in a kilometer?
1 kilometer is about 0.621371192237 miles.
How long is a marathon in miles?
A marathon is 42.195 kilometers, which is 26.218757 miles.
Where do the factors come from?
Miles: NIST SP 811 (2008), Appendix B.8: 1 mi = 1609.344 m exactly (5,280 ft x 0.3048 m). Kilometers: SI Brochure, 9th edition (BIPM 2019): SI prefix kilo = 10^3.
References
- Miles: NIST SP 811 (2008), Appendix B.8: 1 mi = 1609.344 m exactly (5,280 ft x 0.3048 m)
- Kilometers: SI Brochure, 9th edition (BIPM 2019): SI prefix kilo = 10^3
- NIST Special Publication 811: Guide for the Use of the International System of Units (SI), 2008 edition.
- The International System of Units (SI Brochure), 9th edition, BIPM.