Kilometers per hour to Miles per hour Converter
Convert kilometers per hour (km/h) to miles per hour (mph) instantly. Type a value above and the result updates while you type. 1 kilometer per hour equals 0.621371 miles per hour.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 kilometer per hour = 0.621371 miles per hour
Multiply the kilometers per hour value by 0.621371 to get miles per hour. Or divide by 1.60934 to go the other way.
Kilometers per hour to miles per hour conversion table
| km/h | mph |
|---|---|
| 1 | 0.621371 |
| 2 | 1.24274 |
| 3 | 1.86411 |
| 4 | 2.48548 |
| 5 | 3.10686 |
| 6 | 3.72823 |
| 7 | 4.3496 |
| 8 | 4.97097 |
| 9 | 5.59234 |
| 10 | 6.21371 |
| 15 | 9.32057 |
| 20 | 12.4274 |
| 25 | 15.5343 |
| 50 | 31.0686 |
| 75 | 46.6028 |
| 100 | 62.1371 |
Worked examples
- 5 km/h × 0.621371 = 3.10686 mph
- 30 km/h × 0.621371 = 18.6411 mph
- 165 km/h × 0.621371 = 102.526 mph
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
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Frequently asked questions
How many miles per hour are in 1 kilometer per hour?
1 kilometer per hour equals 0.621371 miles per hour (km/h → mph).
How do you convert kilometers per hour to miles per hour?
Multiply the number of kilometers per hour by 0.621371. For example: 10 km/h × 0.621371 = 6.21371 mph.
What is 50 km/h in mph?
50 km/h equals 31.0686 mph.
Which is bigger: 1 kilometer per hour or 1 mile per hour?
1 mile per hour is bigger: 1 kilometer per hour is only 0.621371 miles per hour.