Speed Units by Industry
Road transport uses km/h or mph. Aviation and maritime use knots. Science uses m/s or Mach numbers. Space science uses fractions of c (the speed of light).
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Speed Converter
Convert speed between mph, km/h, knots, m/s, Mach and light.
100 kmh
62,137
mph
Metres/second (m/s)
27,778
Miles/hour (mph)
62,137
Knots (kn)
53,996
Feet/second (ft/s)
91,134
Mach (at sea level)
0,082
Speed of light (c)
9.266e-8