40 mph = 64.3738 km/h
Multiply the number of miles per hour by 1.60934 to get kilometers per hour. Example: 40 × 1.60934 = 64.3738.
Going the other way: 40 km/h = 24.8548 mph (see 40 km/h to mph).
Need a different number? Use the miles per hour to kilometers per hour converter.
| miles per hour | kilometers per hour |
|---|---|
| 10 mph | 16.0934 km/h |
| 15 mph | 24.1402 km/h |
| 20 mph | 32.1869 km/h |
| 25 mph | 40.2336 km/h |
| 30 mph | 48.2803 km/h |
| 35 mph | 56.327 km/h |
| 45 mph | 72.4205 km/h |
| 50 mph | 80.4672 km/h |
| 55 mph | 88.5139 km/h |
| 60 mph | 96.5606 km/h |
| 65 mph | 104.607 km/h |
| 70 mph | 112.654 km/h |