Formula
km/h to mph conversion formula
Use this relationship for a direct conversion:
mph = km/h x 0.621371192237
Worked example
2 km/h = 1.2427423845 mph.
All listed factors are fixed by exact length and time definitions.
Speed conversion
Convert Kilometer per hour to Mile per hour
1 kilometer per hour (km/h) equals 0.621371192237 mile per hour (mph). Enter any value below to convert from km/h to mph.
Enter a value and choose units. Results update instantly.
1 km/h = 0.6213711922 mph
All Speed units
From 1 km/h| Unit | Value |
|---|---|
| Meter per second m/s | 0.2777777778 |
| Kilometer per hour km/h | 1 |
| Mile per hour mph | 0.6213711922 |
| Knot kn | 0.5399568035 |
| Foot per second ft/s | 0.9113444153 |
| Centimeter per second cm/s | 27.7777777778 |
| Speed of light c | 0.0000000009 |
Recent conversions
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Quick reference
Kilometer per hour to Mile per hour table
| Kilometer per hour (km/h) | Mile per hour (mph) |
|---|---|
| 0.01 | 0.0062137119 |
| 0.1 | 0.0621371192 |
| 1 | 0.6213711922 |
| 2 | 1.2427423845 |
| 5 | 3.1068559612 |
| 10 | 6.2137119224 |
| 25 | 15.5342798059 |
| 50 | 31.0685596119 |
| 100 | 62.1371192237 |
| 1,000 | 621.3711922373 |
From unit
About the kilometer per hour
One kilometer traveled in one hour.
Symbol: km/h
To unit
About the mile per hour
One international mile traveled in one hour.
Symbol: mph
Keep converting
Related conversions
Source
Conversion standard
Definitions are checked against BIPM SI Brochure and international unit definitions. Calculations use full internal precision before display rounding.
View the complete speed converterQuestions
km/h to mph FAQ
How do you convert kilometer per hour to mile per hour?
Use the formula mph = km/h x 0.621371192237. 1 kilometer per hour (km/h) equals 0.621371192237 mile per hour (mph).
Is the km/h to mph conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.