Miles per Hour to Kilometers per Hour Converter
Convert miles per hour to kilometers per hour instantly. Type a value, change either unit, or press swap to go the other way. 1 mile per hour = 1.609344 kilometers per hour.
1 mile per hour = 1.609344 kilometers per hour
How to convert miles per hour to kilometers per hour
kilometers per hour = miles per hour × 1.609344
To convert miles per hour to kilometers per hour, multiply the value by 1.609344. To go back from kilometers per hour to miles per hour, divide by the same number (or multiply by 0.6213711922).
Worked examples
- 30 mph: 30 × 1.609344 = 48.28032 km/h
- 40 mph: 40 × 1.609344 = 64.37376 km/h
- 55 mph: 55 × 1.609344 = 88.51392 km/h
Multiply miles per hour by 1.6. A quick benchmark: 30 mph is about 48 km/h, 60 mph about 97 km/h.
Miles per Hour to Kilometers per Hour conversion table
Miles per Hour to Kilometers per Hour
| mph | km/h |
|---|---|
| 5 | 8.04672 |
| 20 | 32.18688 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 55 | 88.51392 |
| 60 | 96.56064 |
| 65 | 104.60736 |
| 70 | 112.65408 |
| 75 | 120.7008 |
| 100 | 160.9344 |
Kilometers per Hour to Miles per Hour
| km/h | mph |
|---|---|
| 5 | 3.106856 |
| 20 | 12.427424 |
| 30 | 18.641136 |
| 40 | 24.854848 |
| 55 | 34.175416 |
| 60 | 37.282272 |
| 65 | 40.389127 |
| 70 | 43.495983 |
| 75 | 46.602839 |
| 100 | 62.137119 |
Speed equivalents
See how one mile per hour and one kilometer per hour compare with every other speed unit on the site.
1 mile per hour equals
| Unit | Value |
|---|---|
| meters per second (m/s) | 0.44704 |
| kilometers per hour (km/h) | 1.609344 |
| feet per second (ft/s) | 1.466667 |
| knots (kn) | 0.8689762 |
1 kilometer per hour equals
| Unit | Value |
|---|---|
| meters per second (m/s) | 0.2777778 |
| miles per hour (mph) | 0.6213712 |
| feet per second (ft/s) | 0.9113444 |
| knots (kn) | 0.5399568 |
When you need to convert miles per hour to kilometers per hour
Speed limits and car speedometers differ between the US and UK, which use miles per hour, and the rest of the world, which uses kilometers per hour. The converter helps drivers on a foreign holiday, anyone importing a vehicle, and readers comparing top speeds in car and sports reviews.
About the units
Mile per hour (mph)
Miles per hour is exactly 0.44704 meters per second. It is used for road speeds in the US and UK.
Kilometer per hour (km/h)
Kilometers per hour is the road speed unit used in most countries. 100 km/h is about 62 mph.
Frequently asked questions
How do I convert miles per hour to kilometers per hour?
Multiply the number of miles per hour by 1.609344. For example, 10 miles per hour × 1.609344 = 16.09344 kilometers per hour.
How many kilometers per hour are in one mile per hour?
There are 1.609344 kilometers per hour in one mile per hour.
How many miles per hour are in one kilometer per hour?
There are 0.6213711922 miles per hour in one kilometer per hour.
How fast is 70 mph in km/h?
70 mph is 112.65 km/h. A typical US highway limit of 65 mph is 104.6 km/h and a UK motorway limit of 70 mph is 112.7 km/h.
Can I convert other speed units with this tool?
Yes. Use the From and To drop-downs in the converter to choose any speed unit, or press the swap button to reverse the conversion. All calculations use internationally defined conversion factors.