Conversion factor
1 mph = 1.60934 km/h
and 1 km/h = 0.621371 mph
The formula
kilometres per hour = miles per hour × 1.60934
Worked example. To convert 10 mph, multiply by 1.60934: 10 × 1.60934 = 16.0934 km/h.
MPH to KM/H conversion table
| miles per hour (mph) | kilometres per hour (km/h) |
|---|---|
| 10 | 16.0934 |
| 20 | 32.1869 |
| 30 | 48.2803 |
| 40 | 64.3738 |
| 50 | 80.4672 |
| 60 | 96.5606 |
| 70 | 112.654 |
| 80 | 128.748 |
| 100 | 160.934 |
About miles per hour and kilometres per hour
Speed converts with exactly the same factor as distance, because the time unit is the same on both sides. One mile per hour is 1.609344 km/h, so the conversion is a single multiplication with no offset.
The numbers worth memorising are the speed limits. UK limits of 20, 30, 40, 60 and 70 mph become 32, 48, 64, 97 and 113 km/h. European limits translate the other way: 50 km/h is 31 mph, 80 km/h is 50 mph, 130 km/h is 81 mph.
Most cars sold in the UK and Ireland show both scales on the dial, with km/h on the inner ring. Rental cars abroad often display only one, and digital dashboards usually let you switch. A useful check when driving in Europe: 100 km/h is 62 mph, close to a UK dual carriageway limit.
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Frequently Asked Questions
- How do I convert mph to km/h?
- Multiply by 1.609344. For a quick estimate, multiply by 1.6, or add half again plus a tenth. 60 mph is 96.6 km/h.
- What is 70 mph in km/h?
- 112.65 km/h. That is the UK motorway limit, which is slightly below the 120 or 130 km/h limits common on European motorways.
- What is 100 km/h in mph?
- 62.14 mph. Divide km/h by 1.609344, or multiply by roughly 0.62.
- Which countries still use mph?
- The United Kingdom and the United States are the main ones for road speed, along with a handful of smaller territories. Most of the world posts limits in km/h.
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