Speed Conversions — km/h to mph, m/s to km/h, knots to mph
Quick speed conversions commonly used for driving, aviation, sports and scientific applications. Convert km/h to mph, mph to km/h, m/s to km/h, knots to mph, knots to km/h, ft/s to m/s and more.
Unit descriptions
Kilometers per hour (km/h)
The standard speed unit in most countries using the metric system. Commonly used for vehicle speeds and wind speeds.
Miles per hour (mph)
Primarily used in the United States and United Kingdom for road traffic speeds. 1 mph = 1.609344 km/h.
Meters per second (m/s)
The SI unit for speed, commonly used in scientific contexts. 1 m/s = 3.6 km/h.
Knots (kn)
A unit of speed equal to one nautical mile per hour, used in maritime and aviation contexts worldwide.
Browse Speed Conversions
Speed Conversion Tables
1 km/h
= 0.6213711922 mph · = 0.2777777778 m/s · = 0.5399568035 knots
1 mph
= 1.609344 km/h · = 0.44704 m/s · = 0.8689762419 knots
1 m/s
= 3.6 km/h · = 2.2369362921 mph · = 1.9438444924 knots
1 knot
= 1.852 km/h · = 1.150779448 mph · = 0.5144444444 m/s
1 ft/s
= 1.09728 km/h · = 0.6818181818 mph · = 0.3048 m/s
Mach 1
= 1234.8 km/h · = 767.269148 mph · = 340.29 m/s (at sea level)
Common Speed Conversions
Speed limit 50 km/h
= 31.07 mph
Highway speed 65 mph
= 104.61 km/h
Wind speed 10 m/s
= 36 km/h = 22.37 mph
Typical cruise speed
500 knots = 926 km/h = 575 mph
Sound speed at sea level
Mach 1 = 1,234.8 km/h = 767 mph
Results may be rounded depending on the selected decimal mode. Mach values vary with altitude and temperature.