How do I convert km/h to mph?

Multiply km/h by 0.621371. For example, 100 km/h ≈ 62.14 mph.

A knot is one nautical mile per hour (1.852 km/h). It's the standard speed unit in aviation and maritime.

Mach 1 is the speed of sound, approximately 340.3 m/s (1,225 km/h or 761 mph) at sea level and 15°C.

What speed units do cars use?

Most countries use km/h. The US, UK, and a few others use mph on road signs.

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Convert between speed units including km/h, mph, m/s, knots, feet per second, and Mach instantly in your browser.

Value

Result

62.1372

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