Miles per Hour to Kilometres per Hour
Multiply by 1.609344 — the same exact factor as miles to kilometres, because the "per hour" cancels on both sides.
The rows below are the speed limits that matter when driving abroad in either direction. The one worth memorising is that 30mph is just under 50km/h, which is the standard urban limit across most of Europe, so the two systems agree more closely in town than they do on a motorway.
The formula
kilometres per hour = miles per hour × 1.609344
Miles per Hour to Kilometres per Hour table
| Miles per hour | Kilometres per hour |
|---|---|
| 10 | 16.09344 |
| 20 | 32.18688 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 50 | 80.4672 |
| 60 | 96.56064 |
| 70 | 112.65408 |
| 80 | 128.74752 |
| 100 | 160.9344 |