How to convert kilometers to miles
Useful for road distance, running routes, and international travel. Multiply the kilometer value by the exact unit relationship shown below. CalcOS evaluates through the meter so this route and its inverse always share one certified definition.
mi = km × 0.621371192237
Worked example: 5 km = 3.10685596119 mi.
kilometers to miles conversion table
| kilometer (km) | mile (mi) |
|---|---|
| 1 | 0.621371192237 |
| 5 | 3.10685596119 |
| 10 | 6.21371192237 |
| 25 | 15.5342798059 |
| 50 | 31.0685596119 |
| 100 | 62.1371192237 |
Definitions and precision
The international inch, foot, yard, and mile are exact consequences of 1 inch = 0.0254 meter. Metric prefixes are exact powers of ten. Results may still display rounded decimals because many inverse relationships are repeating numbers.
Related length conversions
Sources: BIPM SI Brochure and NIST Handbook 44, Appendix C. Also see the complete Length Converter guide.