Speed Converter
Convert km/h, mph, m/s, knots and feet per second.
Result
0.621371 mph
1 km/h = 0.621371 mph
1 km/h in every unit
Metre per second0.277778
Kilometre per hour1
Mile per hour0.621371
Knot0.539957
Foot per second0.911344
About the Speed Converter
Speed limits, wind speeds and running paces all come in different units — kilometres per hour, miles per hour, metres per second, knots at sea and in the air. The AlarmDaddy Speed Converter switches between all of them instantly.
Enter a speed, choose the units, and read the result plus every unit at once — handy for converting a car's mph to km/h or a wind forecast from knots.
How to use this calculator
- 1Enter the speed value.
- 2Choose the unit to convert from.
- 3Choose the unit to convert to.
- 4Read the result and the all-units table.
The formula
Each unit is defined in metres per second (1 km/h = 0.2777… m/s, 1 mph = 0.44704 m/s, 1 knot = 0.514444 m/s). The value is converted to m/s, then divided by the target unit.
Frequently asked questions
Multiply miles per hour by 1.60934. For example, 60 mph is about 96.6 km/h.