Speed Converter
Convert between speed and velocity units — km/h, mph, m/s, knots, ft/s, and more.
Enter a value
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m/s
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km/h
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mph
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ft/s
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kn
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Mach
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About this converter
Common conversions
60 mph ≈ 96.6 km/h. 100 km/h ≈ 62.1 mph. 1 knot = 1 nautical mile/hour ≈ 1.15 mph ≈ 1.85 km/h.
When are knots used?
Marine navigation, aviation, and meteorology. 1 nautical mile is the length of one minute of latitude — convenient on charts.
Mach number
Mach is a ratio: speed ÷ local speed of sound. At sea level on a standard day, Mach 1 ≈ 343 m/s ≈ 1,235 km/h ≈ 767 mph. It varies with altitude and temperature.