Speed Converter
Convert between miles per hour, kilometers per hour, meters per second, knots, and feet per second. Enter a speed value and select the units.
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Speed Unit Reference
Different countries and contexts use different speed units. The US uses miles per hour, most of the world uses km/h, and nautical/aviation uses knots.
Common Speed Conversions
- 1 mph = 1.609 km/h = 0.447 m/s
- 1 km/h = 0.621 mph = 0.278 m/s
- 1 knot = 1.151 mph = 1.852 km/h
- 1 m/s = 2.237 mph = 3.6 km/h
- Speed of sound: 767 mph = 1,235 km/h