MOTION
Speed
Linear speed for travel, wind and physics.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Result0.621371 mph1 km/h = 0.621371 mph
EVERYDAY · ENGINEERING · SCIENCE
km/h to mph Converter
Convert kilometre per hour (km/h) to mile per hour (mph). Enter a value for an instant result, or use the examples and reverse conversion below.
520units ready to convert
HOW IT IS CALCULATED
Convert through metre per second
Enter a kilometre per hour value to calculate mile per hour with full internal precision before display rounding.
Display PrecisionAuto · 6 significant digits
Auto trims unnecessary zeroes and uses scientific notation for extreme magnitudes. Use Digits to set the display precision; calculations retain full precision.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| metre per secondfrom km/h | m/s | 0.277778 |
| centimetre per secondfrom km/h | cm/s | 27.7778 |
| foot per secondfrom km/h | ft/s | 0.911344 |
| kilometre per hourfrom km/h | km/h | 1 |
| mile per hourfrom km/h | mph | 0.621371 |
| knotfrom km/h | kn | 0.539957 |
| kilometre per secondfrom km/h | km/s | 0.000277778 |
| speed of light in vacuumfrom km/h | c | 9.26567e-10 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
km/h to mph Conversion Reference
Kilometre Per Hour (km/h) and mile per hour (mph) are units of speed. Use this page to convert in either direction.
Conversion Examples
| Kilometre Per Hour (km/h) | Mile Per Hour (mph) |
|---|---|
| 1 km/h | 0.621371 mph |
| 5 km/h | 3.10686 mph |
| 10 km/h | 6.21371 mph |
| 100 km/h | 62.1371 mph |
Examples are rounded to 6 significant digits. The interactive converter retains full calculation precision; change Display Precision to see more digits.
Reverse Conversion
mph to km/h (mile per hour to kilometre per hour)
Related Speed Conversions
km/h to m/s (kilometre per hour to metre per second)km/h to cm/s (kilometre per hour to centimetre per second)km/h to ft/s (kilometre per hour to foot per second)km/h to kn (kilometre per hour to knot)km/h to km/s (kilometre per hour to kilometre per second)km/h to c (kilometre per hour to speed of light in vacuum)