Speed Converter
Convert between different speed units instantly. Support for km/h, mph, m/s, knots, feet per second, and more.
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Quick Conversions
100 km/h = 62.137 mph
Highway speed limit
1 m/s = 3.6 km/h
Basic conversion
1 knot = 1.852 km/h
Nautical speed
Mach 1 = 1235 km/h
Speed of sound
Conversion Formulas
km/h to mph: mph = km/h × 0.621371
m/s to km/h: km/h = m/s × 3.6
knots to km/h: km/h = knots × 1.852
ft/s to mph: mph = ft/s × 0.681818
Speed Units
Kilometers per Hour (km/h)
Most common metric unit for vehicle speeds
Miles per Hour (mph)
Imperial unit used in US and UK
Meters per Second (m/s)
SI base unit for speed
Knots
Nautical miles per hour, used in aviation and maritime