Speed Converter

Convert between km/h, mph, m/s, knots, and Mach number instantly.

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How fast is Mach 1?

Mach 1 = 343 m/s = 1,235 km/h = 767 mph at sea level at 20°C. It varies with altitude and temperature.

What is a knot?

1 knot = 1 nautical mile per hour = 1.852 km/h = 1.151 mph. Used in aviation and maritime navigation.