Speed & Velocity converter
km/h, mph, knots, mach and the speed of light.
Speed limits, wind reports, boat logs and aviation all use different units for the same idea. Convert between metric, imperial, nautical and scientific speeds instantly.
Result
1 km/h = 0.6213711922 mph
Multiply the number of kilometers per hour by 0.621371192237.
Results are rounded for display. Double-check values for critical work.
Popular speed & velocity conversions
All speed & velocity units
Meter per Secondm/s
Kilometer per Hourkm/h
Mile per Hourmph
Foot per Secondft/s
Knotkn
Centimeter per Secondcm/s
Meter per Minutem/min
Kilometer per Secondkm/s
Kilometer per Minutekm/min
Mile per Secondmi/s
Mile per Minutemi/min
Inch per Secondin/s
Foot per Minuteft/min
Mach (sea level)M
Speed of Lightc
Popular speed & velocity conversions
- Kilometers per Hour to Miles per Hourkm/h→mph
- Miles per Hour to Kilometers per Hourmph→km/h
- Meters per Second to Kilometers per Hourm/s→km/h
- Knots to Miles per Hourkn→mph
- Knots to Kilometers per Hourkn→km/h
- Meters per Second to Miles per Hourm/s→mph
- Mach to Kilometers per HourM→km/h
- Feet per Second to Miles per Hourft/s→mph