Speed Converter

Convert between different units of speed and velocity. Choose your units below for an instant result.

From

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1 m/s = km/h

Popular Speed Conversions

Metres per Second → Kilometres per Hourm/s → km/h Metres per Second → Miles per Hourm/s → mph Metres per Second → Knotm/s → kn Metres per Second → Feet per Secondm/s → ft/s Metres per Second → Machm/s → Ma Kilometres per Hour → Miles per Hourkm/h → mph Kilometres per Hour → Knotkm/h → kn Kilometres per Hour → Feet per Secondkm/h → ft/s Kilometres per Hour → Machkm/h → Ma Miles per Hour → Knotmph → kn Miles per Hour → Feet per Secondmph → ft/s Miles per Hour → Machmph → Ma

About Speed Conversions

Miles per hour versus kilometres per hour

Road speed limits are shown in mph in the UK and USA, and in km/h in most of the rest of the world. The conversion is: 1 mph = 1.609 km/h, or roughly "multiply mph by 1.6 to get km/h." A 70 mph motorway limit is 113 km/h; a 100 km/h autobahn limit is about 62 mph.

Knots in aviation and maritime navigation

A knot is one nautical mile per hour (1.852 km/h or 1.151 mph). Nautical miles and knots were adopted because they relate directly to degrees of latitude — one nautical mile equals one arcminute of latitude — making navigation calculations simpler. Aircraft airspeed and ship speed are still universally measured in knots.

The speed of sound and Mach numbers

The speed of sound varies with altitude and air temperature — at sea level at 15 °C it is approximately 343 m/s, 1,235 km/h, or 767 mph. Mach 1 represents this speed; Mach 2 is twice the speed of sound. The Concorde cruised at approximately Mach 2, while space shuttles re-entered the atmosphere at around Mach 25.

All Speed Units

Metres per Secondm/s

Kilometres per Hourkm/h

Miles per Hourmph

Knotkn

Feet per Secondft/s

MachMa