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1 mph = 1.609344 km/h
Open in Unit ConverterFormula
km/h = mph × 1.609344
How to convert
To convert miles per hour to kilometers per hour, multiply the value by 1.609344. For example, 5 mph = 8.04672 km/h.
Conversion table
| mph | km/h |
|---|---|
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 km/h |
| 30 mph | 48.28032 km/h |
| 40 mph | 64.37376 km/h |
| 50 mph | 80.4672 km/h |
| 55 mph | 88.51392 km/h |
| 60 mph | 96.56064 km/h |
| 65 mph | 104.60736 km/h |
| 70 mph | 112.65408 km/h |
| 80 mph | 128.74752 km/h |
| 100 mph | 160.9344 km/h |
About these units
Road speeds are given in kilometers per hour in most countries and in miles per hour in the US and the UK. 1 mph is exactly 1.609344 km/h, because a mile is 1,609.344 m. Science and engineering use meters per second (1 m/s = 3.6 km/h), and ships and aircraft use knots: one nautical mile (1,852 m) per hour, about 1.852 km/h or 1.151 mph.
FAQ
› How do I convert mph to km/h?
1 mph = 1.609344 km/h. To convert, multiply the value by 1.609344: 5 mph = 8.04672 km/h.
› What is 1 km/h in mph?
1 km/h = 0.6213711922 mph. The reverse formula is mph = km/h ÷ 1.609344.
› How do I convert km/h to m/s quickly?
Divide by 3.6. For example, 90 km/h is 25 m/s; to go back, multiply m/s by 3.6.
› Why do ships and planes use knots?
A nautical mile matches one minute of latitude, so speeds in knots fit naturally with navigation charts.