Speed Unit Converter
Convert between m/s, km/h, mph, knots, Mach, and the speed of light.
m/s
27.778
km/h
100
mph
62.137
ft/s
91.134
Knot (kn)
53.996
Mach (≈ 343 m/s)
0.081
Speed of Light (c)
0
Frequently Asked Questions
How fast is Mach 1?
Mach 1 = the speed of sound = ~340 m/s = ~1235 km/h = ~767 mph at sea level at 15°C. It varies with altitude and temperature.
How many km/h is 60 mph?
60 mph = 96.56 km/h.