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How to use this converter
Enter a signed decimal where allowed, then select Convert or press Enter. Comma decimals and expressions are rejected rather than guessed. Copy produces a plain conversion statement without promotional text.
Definition and review
Constants follow NIST Guide to the SI, Appendix B.8. Values are calculated locally; raw numbers are not uploaded, stored, placed in URLs, or included in analytics.
Common kilometers per hour conversions
| Kilometers per hour (km/h) | Miles per hour (mph) |
|---|---|
| 1 km/h | 0.6213711922 mph |
| 10 km/h | 6.213711922 mph |
| 30 km/h | 18.64113577 mph |
| 50 km/h | 31.06855961 mph |
| 100 km/h | 62.13711922 mph |
| 120 km/h | 74.56454307 mph |