Miles per hour to kilometers per hour
1 mile per hour = 1.61 kilometers per hour
For any other value: km/h = mph × 1.609344
Calculator
128.7 km/h
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You can leave the unit in: 100 mph is fine.
Miles per hour to kilometers per hour chart
The values people look up most.
| miles per hour | kilometers per hour |
|---|---|
| 80 mph | 128.7 km/h |
| 200 mph | 321.9 km/h |
| 70 mph | 112.7 km/h |
| 120 mph | 193.1 km/h |
| 60 mph | 96.6 km/h |
| 90 mph | 144.8 km/h |
| 220 mph | 354.1 km/h |
| 100 mph | 160.9 km/h |
| 20 mph | 32.2 km/h |
| 160 mph | 257.5 km/h |
| 130 mph | 209.2 km/h |
| 140 mph | 225.3 km/h |
| 55 mph | 88.5 km/h |
| 65 mph | 104.6 km/h |
| 75 mph | 120.7 km/h |
| 50 mph | 80.5 km/h |
| 85 mph | 136.8 km/h |
| 40 mph | 64.4 km/h |
| 45 mph | 72.4 km/h |
| 30 mph | 48.3 km/h |
| 35 mph | 56.3 km/h |
| 25 mph | 40.2 km/h |
| 15 mph | 24.1 km/h |
| 110 mph | 177 km/h |
| 150 mph | 241.4 km/h |
| 230 mph | 370.1 km/h |
| 16 mph | 25.7 km/h |
| 180 mph | 289.7 km/h |
| 10 mph | 16.1 km/h |
| 95 mph | 152.9 km/h |
Formula
km/h = mph × 1.609344
Most of these are car speeds. 100 km/h is 62 mph and 120 km/h is 75 mph.
Where this number comes from
This factor is exact, not rounded. Follows from the mile of exactly 1,609.344 m.
Source: NIST Guide to the SI, Appendix B: Conversion Factors, NIST (National Institute of Standards and Technology, USA).
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