Convert Miles per Hour to Kilometers per Hour (mph to km/h)
1 mile per hour (mph) = 1.609344 kilometers per hour (km/h). 1 km/h = 0.6213711922 mph. Example: 60 mph = 60 × 1.609344 = 96.56064 km/h.
Also searched as mph to kmh, mph to kph, mph in km/h, miles per hour to kilometres per hour, mph to km/hr and how many km/h in a mile per hour.
1 mph = 1.609344 km/h
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk mile per hour to kilometer per hour converter to paste a column from Excel.
How to Convert Mile per Hour to Kilometer per Hour
- 1 mph = 1.609344 km/h
- 1 km/h = 0.6213711922 mph
- Example: convert 60 mph to km/h: 60 mph = 60 × 1.609344 km/h = 96.56064 km/h
Formula
km/h = mph × 1.609344
Derivation from SI units:
- 1 mph = 1609.344 m ÷ 3600 s = 0.44704 m/s exactly.
- 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s exactly.
- 1 mph = 0.44704 m/s ÷ 0.2777777777778 m/s per km/h = 1.609344 km/h
Both units are defined exactly, so the factor is exact. Mile per Hour definition: mile per hour; Kilometer per Hour definition: kilometer per hour.
Worked examples
- A speed of 60 mph is 96.56064 km/h.
60 mph × 1.609344 = 96.56064 km/h - A UK motorway limit of 70 mph is 112.65408 km/h.
70 mph × 1.609344 = 112.65408 km/h
Mile per Hour to Kilometer per Hour conversion table
| Miles per Hour (mph) | Kilometers per Hour (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 |
| 75 mph | 120.7008 km/h |
Where it's used
Speeds in miles per hour from US and UK roads, car specifications and sports are converted to kilometres per hour for Canada, Australia, India and Europe. Multiply by 1.609344.
Mile per Hour to other speed units
| Conversion | 1 mph equals |
|---|---|
| mile per hour to kilometer per hour | 1.609344 km/h |
| mile per hour to meter per second | 0.44704 m/s |
| mile per hour to foot per second | 1.466666667 ft/s |
| mile per hour to knot | 0.8689762419 kn |
Frequently asked questions
How do I convert mph to km/h?
Multiply by 1.609344 (exactly): 60 mph = 96.56064 km/h.
Is there a quick way to estimate km/h from mph?
Multiply by 1.6, or add 60 %: 50 mph is about 80 km/h.
How many kilometers per hour are in 1 mile per hour?
1 mph = 1.609344 km/h.
How do I convert miles per hour to kilometers per hour?
Multiply the value in mph by 1.609344. For example, 60 mph × 1.609344 = 96.56064 km/h.
Is the mph to km/h conversion exact?
Yes. Both units are defined exactly, and 1 mph is exactly 1.609344 km/h.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "mile per hour".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (radian) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Miles per Hour to Kilometers per Hour (mph to km/h). Retrieved October 25, 2026, from https://scientificconverters.com/speed/miles-per-hour-to-kilometers-per-hour/
IEEE
Scientific Converters, "Convert Miles per Hour to Kilometers per Hour (mph to km/h)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/speed/miles-per-hour-to-kilometers-per-hour/