Speed Reference Sheet

1 meter per second (m/s) = 3.6 kilometers per hour (km/h)

1 kilometer per hour (km/h) = 0.27778 meters per second (m/s)

1 mile per hour (mph) = 1.46667 feet per second (ft/s)

1 foot per second (ft/s) = 0.681818 miles per hour (mph)

1 mile per hour (mph) ≈ 1.60934 kilometers per hour (km/h)

1 foot per second (ft/s) ≈ 0.3048 meters per second (m/s)

1 kilometer per hour (km/h) ≈ 0.621371 miles per hour (mph)

1 meter per second (m/s) ≈ 2.23694 miles per hour (mph)

1 meter per second (m/s) ≈ 3.28084 feet per second (ft/s)

km/h	mph	m/s
5	3.11	1.39
10	6.21	2.78
20	12.43	5.56
50	31.07	13.89
80	49.71	22.22
100	62.14	27.78

Brisk walk ≈ 5 km/h ≈ 3.1 mph

Easy jog ≈ 10 km/h ≈ 6.2 mph

Typical city limit ≈ 50 km/h ≈ 31 mph

Freeway speed ≈ 100 km/h ≈ 62 mph

Speed of sound (air, 20 °C) ≈ 343 m/s ≈ 1,235 km/h