UnitSnapMiles per Hour to Kilometers per Hour
1 mph = 1.609344 km/h
Miles per hour to kilometers per hour is the conversion for Americans and Britons driving abroad, and for anyone adapting US or UK speed figures for a metric audience. Rental cars outside the US and UK show km/h, and road signs in most countries are metric.
When you need to convert miles per hour to kilometers per hour
- Driving a rental car abroad after learning to drive in mph
- Converting a US or UK car top speed for a metric spec sheet
- Translating hurricane wind speeds from US advisories
- Comparing treadmill or cycling speeds shown in mph
How to convert miles per hour to kilometers per hour
km/h = mph × 1.609344
Example: 5 mph = 8.04672 km/h
Common speed limits
| Miles per Hour (mph) | Kilometers per Hour (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 | 104.6074 km/h |
| 70 mph | 112.6541 km/h |
| 80 mph | 128.7475 km/h |
Tips for converting miles per hour to kilometers per hour
- One mile is exactly 1.609344 km. Multiplying by 1.6 (add 60%) is within about 0.6%.
- To double-check, the km/h figure should always be a bit more than one and a half times the mph figure.
- Many speedometers show km/h in a smaller inner ring; it is worth checking which scale the needle is reading.
Miles per Hour to Kilometers per Hour conversion table
| Miles per Hour (mph) | Kilometers per Hour (km/h) |
|---|---|
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 3 mph | 4.828032 km/h |
| 4 mph | 6.437376 km/h |
| 5 mph | 8.04672 km/h |
| 6 mph | 9.656064 km/h |
| 7 mph | 11.26541 km/h |
| 8 mph | 12.87475 km/h |
| 9 mph | 14.4841 km/h |
| 10 mph | 16.09344 km/h |
| 15 mph | 24.14016 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 |
| 75 mph | 120.7008 km/h |
| 100 mph | 160.9344 km/h |
| 250 mph | 402.336 km/h |
| 500 mph | 804.672 km/h |
| 1,000 mph | 1,609.344 km/h |
About the units
Miles per Hour: Miles per hour (mph) is the unit for road speed in the United States and the United Kingdom. 1 mph is exactly 0.44704 m/s.
Kilometers per Hour: Kilometers per hour is the unit for road speed limits and vehicle speedometers in most countries.
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Frequently asked questions
How many kilometers per hour are in 1 mile per hour?
1 mile per hour equals 1.609344 kilometers per hour.
How many miles per hour are in 1 kilometer per hour?
1 kilometer per hour equals 0.6213712 miles per hour.
How do I convert miles per hour to kilometers per hour?
Use the formula km/h = mph × 1.609344.
What is 10 miles per hour in kilometers per hour?
10 miles per hour equals 16.09344 kilometers per hour.
Related conversions
- Kilometers per Hour to Miles per Hour
- Meters per Second to Kilometers per Hour
- Kilometers per Hour to Meters per Second
- Meters per Second to Miles per Hour
- Miles per Hour to Meters per Second
- Knots to Kilometers per Hour
- Kilometers per Hour to Knots
- Knots to Miles per Hour
- Miles per Hour to Knots
- Feet per Second to Meters per Second
- Meters per Second to Feet per Second
- Mach (at 20 °C) to Kilometers per Hour
- Kilometers per Hour to Mach (at 20 °C)
- All speed units
Factors: NIST SP 811 · SI Brochure · NIST Handbook 44 — Updated