Convert Kilometers per Hour to Miles per Hour (km/h to mph)
1 kilometer per hour (km/h) = 0.6213711922 miles per hour (mph). 1 mph = 1.609344 km/h. Example: 100 km/h = 100 × 0.6213711922 = 62.13711922 mph.
Also searched as kmh to mph, kph to mph, km/h in mph, kilometres per hour to miles per hour, km/hr to mph and how many mph is 100 km/h.
1 km/h = 0.6213711922 mph
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilometer per hour to mile per hour converter to paste a column from Excel.
How to Convert Kilometer per Hour to Mile per Hour
- 1 km/h = 0.6213711922 mph
- 1 mph = 1.609344 km/h
- Example: convert 100 km/h to mph: 100 km/h = 100 × 0.6213711922 mph = 62.13711922 mph
Formula
mph = km/h × 0.6213711922373
or mph = km/h ÷ 1.609344
Derivation from SI units:
- 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s exactly.
- 1 mph = 1609.344 m ÷ 3600 s = 0.44704 m/s exactly.
- 1 km/h = 0.2777777777778 m/s ÷ 0.44704 m/s per mph = 0.6213711922373 mph
Both units are defined exactly, so the factor is exact. Kilometer per Hour definition: kilometer per hour; Mile per Hour definition: mile per hour.
Worked examples
- A highway limit of 100 km/h is 62.13711922 mph.
100 km/h × 0.6213711922 = 62.13711922 mph - An urban limit of 50 km/h is 31.06855961 mph.
50 km/h × 0.6213711922 = 31.06855961 mph
Kilometer per Hour to Mile per Hour conversion table
| Kilometers per Hour (km/h) | Miles per Hour (mph) |
|---|---|
| 10 km/h | 6.213711922 mph |
| 30 km/h | 18.64113577 mph |
| 40 km/h | 24.85484769 mph |
| 50 km/h | 31.06855961 mph |
| 60 km/h | 37.28227153 mph |
| 80 km/h | 49.70969538 mph |
| 90 km/h | 55.9234073 mph |
| 100 km/h | 62.13711922 mph |
| 110 km/h | 68.35083115 mph |
| 120 km/h | 74.56454307 mph |
| 130 km/h | 80.77825499 mph |
Where it's used
Speeds in km/h from Canadian, Australian and European road signs, cars and weather reports are converted to miles per hour for US and UK drivers. Divide by 1.609344.
Kilometer per Hour to other speed units
| Conversion | 1 km/h equals |
|---|---|
| kilometer per hour to mile per hour | 0.6213711922 mph |
| kilometer per hour to meter per second | 0.2777777778 m/s |
| kilometer per hour to foot per second | 0.9113444153 ft/s |
| kilometer per hour to knot | 0.5399568035 kn |
Frequently asked questions
How do I convert km/h to mph?
Divide by 1.609344, or multiply by 0.621371: 100 km/h = 62.13711922 mph.
What is 120 km/h in mph?
120 km/h = 74.56454307 mph, a common motorway limit in Europe and Australia.
How many miles per hour are in 1 kilometer per hour?
1 km/h = 0.6213711922 mph.
How do I convert kilometers per hour to miles per hour?
Multiply the value in km/h by 0.6213711922, or divide it by 1.609344. For example, 100 km/h × 0.6213711922 = 62.13711922 mph.
Is the km/h to mph conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- 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).
- 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".
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 Kilometers per Hour to Miles per Hour (km/h to mph). Retrieved October 25, 2026, from https://scientificconverters.com/speed/kilometers-per-hour-to-miles-per-hour/
IEEE
Scientific Converters, "Convert Kilometers per Hour to Miles per Hour (km/h to mph)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/speed/kilometers-per-hour-to-miles-per-hour/