Speed Converter

Speed Converter — km/h, mph, m/s, knots

Convert speed units: kilometers per hour, miles per hour, meters per second, knots, Mach and more. Free and instant.

FAQ

How do I convert km/h to mph?

Multiply km/h by 0.621371.

How fast is Mach 1?

Mach 1 ≈ 1,225 km/h (340 m/s) at sea level.

How many km/h is 1 knot?

1 knot = 1.852 km/h.