How to convert kph to mph
Useful when comparing metric road speeds with mile-based speed limits and vehicle data. CalcOS derives the conversion from the exact international mile and exact metric definitions.
mph = km/h × 0.621371192237
Worked example: 100 km/h = 62.1371192237 mph.
KPH to MPH conversion table
| kilometer per hour (km/h) | mile per hour (mph) |
|---|---|
| 1 | 0.621371192237 |
| 5 | 3.10685596119 |
| 10 | 6.21371192237 |
| 25 | 15.5342798059 |
| 50 | 31.0685596119 |
| 100 | 62.1371192237 |
Speed is distance divided by time
Miles per hour and kilometers per hour compare distances traveled during the same one-hour duration. Because the hour cancels, their relationship is the exact mile-to-kilometer relationship.
Related speed conversion
Sources: NIST Handbook 44, Appendix C and the BIPM SI Brochure. See the complete Speed Converter guide.