Meters per Second to Miles per Hour

Meters per second and miles per hour

The meter per second is the SI unit of speed: one meter traveled each second, which is exactly 3.6 km/h. Physics, engineering and wind speeds in scientific forecasts are given in meters per second.

A mile per hour is one international mile per hour: exactly 0.44704 m/s, or 1.609344 km/h. Speed limits and speedometers in the US and UK, and pitch speeds in baseball, use mph.

Worked example

Convert 10 m/s: 10 × 2.236936292 = 22.36936292, so 10 meters per second is 22.36936292 miles per hour. Likewise 50 m/s = 111.8468146 mph.

Estimating in your head

Multiply by 2.2 for a quick figure; it is off by about 1.7%. For 10 m/s that gives 22 mph, against 22.3694 exactly.

Going the other way

To convert miles per hour to meters per second, divide by 2.236936292 (or multiply by 0.44704). The swap button between the boxes opens that page.

mph = m/s × 2.236936292

1 m/s = 1 m/s and 1 mph = 0.44704 m/s, both by definition, so the factor is their ratio: 2.236936292 (rounded here; the page uses the full value). Results drop binary floating-point noise beyond 15 significant digits and display at the precision you choose (6 significant figures by default). Copy result copies the full value.