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How to use Speed Converter

Enter a value and pick its unit (m/s, km/h, mph, knots, Mach), and the tool converts it to every other speed unit live.

Frequently asked questions

How do I convert km/h to mph?

Divide km/h by 1.60934, or multiply by 0.62137. So 100 km/h ≈ 62.14 mph.

What is a knot in km/h?

1 knot (nautical mile per hour) = 1.852 km/h = 1.15078 mph.

What speed is Mach 1?

Mach 1 is the local speed of sound, about 1,225 km/h (761 mph) at sea level and 15°C — it varies with altitude and temperature.

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