US, metric and nautical units
Speed Converter
Convert a speed between miles per hour, kilometers per hour, meters per second, feet per second and knots.
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How speed conversion works
Each speed is first converted to meters per second, then to your chosen unit. The factors are based on 1 mile = 1.609344 km, 1 foot = 0.3048 m and 1 nautical mile = 1,852 m.
Example: 60 mph to km/h
Multiply mph by 1.609344: 60 × 1.609344 = 96.56064 km/h, shown as approximately 96.56 km/h.
Common conversion factors
- mph to km/h: multiply by 1.609344.
- km/h to mph: divide by 1.609344.
- m/s to km/h: multiply by 3.6.
- knots to km/h: multiply by 1.852.
A knot is one nautical mile per hour and is commonly used for aircraft and boats. This converter uses the international foot and international mile.
Need to calculate speed from a journey? Use the distance-and-time speed calculator.