Miles an hour to kilometres an hour
Convert miles an hour to kilometres an hour. To convert miles an hour to kilometres an hour, multiply by 1.609.
Factors from their legal definitions.
Result
70 miles an hour is 112.654 kilometres an hour.
| One mile an hour | 1.609 km/h |
|---|---|
| One kilometre an hour | 0.6214 mph |
Show the workings
| Step | Sum | Answer |
|---|---|---|
| One mile an hour in kilometres an hour | 1760 × 0.9144 m ÷ 1,000 | 1.609 km/h |
| In kilometres an hour | 70 × 1.609 | 112.654 km/h |
Where the figures come from
- A yard in metres: 0.914 m per yard. Source: Weights and Measures Act 1985, Schedule 1. Checked 13 November 2026.
- Yards in a mile: 1,760 yards per mile. Source: Weights and Measures Act 1985, Schedule 1. Checked 13 November 2026.
Miles an hour to kilometres an hour table
| Miles an hour | Kilometres an hour |
|---|---|
| 0.5 mph | 0.8047 km/h |
| 1 mph | 1.609 km/h |
| 2 mph | 3.219 km/h |
| 3 mph | 4.828 km/h |
| 4 mph | 6.437 km/h |
| 5 mph | 8.047 km/h |
| 6 mph | 9.656 km/h |
| 7 mph | 11.265 km/h |
| 8 mph | 12.875 km/h |
| 9 mph | 14.484 km/h |
| 10 mph | 16.093 km/h |
| 12 mph | 19.312 km/h |
| 15 mph | 24.14 km/h |
| 20 mph | 32.187 km/h |
| 25 mph | 40.234 km/h |
| 30 mph | 48.28 km/h |
| 40 mph | 64.374 km/h |
| 50 mph | 80.467 km/h |
| 75 mph | 120.701 km/h |
| 100 mph | 160.934 km/h |
How to convert miles an hour to kilometres an hour
One mile an hour is 1.609 kilometres an hour, and one kilometre an hour is 0.6214 miles an hour. So to turn miles an hour into kilometres an hour, multiply by 1.609. For example, 70 miles an hour × 1.609 = 112.654 kilometres an hour.
Where the numbers come from
Imperial units are defined in law as exact amounts of metric ones. These are the definitions this converter uses:
- A yard in metres: 0.914 m per yard. Source: Weights and Measures Act 1985, Schedule 1.
- Yards in a mile: 1,760 yards per mile. Source: Weights and Measures Act 1985, Schedule 1.