Speed Unit Conversion Tool

Speed Conversion

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Real-time Conversion (Enter any value to automatically display common units)

Meters per second (m/s)

Kilometers per hour (km/h)

Miles per hour (mph)

Feet per second (ft/s)

Knots (knot)

Mach

Common Speed References

Object/Scenario	Meters per second (m/s)	Kilometers per hour (km/h)	Miles per hour (mph)
Walking Speed	1.4	5	3.1
Running Speed	5	18	11
Bolt's 100m World Record	10.44	37.58	23.35
Bicycle (Casual Riding)	5-8	18-30	11-19
Electric Bicycle	7	25	15.5
City Road Speed Limit	13.9	50	31
Highway Speed Limit	33.3	120	75
High-Speed Rail (Bullet Train)	83.3	300	186
Race Car (F1 Top Speed)	100	360	224
Commercial Airliner Cruising Speed	250	900	559
Speed of Sound (Sea Level, 15°C)	340	1224	761
Fighter Jet (Supersonic)	680-850	2448-3060	1521-1901
Bullet (Handgun)	350-450	1260-1620	783-1007
Bullet (Rifle)	700-1000	2520-3600	1566-2237
Rocket Escape Velocity (Earth)	11200	40320	25054
Earth's Orbital Speed Around the Sun	29780	107208	66616
Speed of Light	299792458	1079252848.8	670616629

Conversion Factors

Metric Units (based on meters per second)

1 meter/second (m/s) = 1 meter/second

1 kilometer/hour (km/h) = 0.277778 meter/second

1 kilometer/second (km/s) = 1,000 meters/second

1 centimeter/second (cm/s) = 0.01 meter/second

1 millimeter/second (mm/s) = 0.001 meters/second

Imperial Units

1 mile/hour (mph) ≈ 0.44704 meters/second

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

1 inch/second (in/s) ≈ 0.0254 meters/second

Nautical Units

1 knot ≈ 0.514444 meters/second

1 knot = 1 nautical mile/hour ≈ 1.852 kilometers/hour

Special Units

1 Mach ≈ 340.29 meters/second (at sea level, 15°C)

Speed of light (c) = 299,792,458 meters/second (in vacuum)

Common Conversions

100 km/h ≈ 27.78 m/s ≈ 62.14 mph

60 mph ≈ 26.82 m/s ≈ 96.56 km/h

1 m/s = 3.6 km/h

1 mph ≈ 1.60934 km/h

1 knot ≈ 1.15078 mph

Application Areas

Meters/second (m/s): Used in scientific calculations, physics, and engineering

Kilometers/hour (km/h): Vehicle speed, road signs (China and most countries)

Miles/hour (mph): Vehicle speed (USA, UK, and other countries)

Knot: Navigation and aviation (nautical miles per hour)

Mach: Aviation and supersonic flight (multiple of the speed of sound)

Speed of light (c): Astronomy and relativistic physics

Batch conversion (one value per line, format: number unit)

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About Speed Units:

Meters/second (m/s):The standard SI unit of speed, representing meters traveled per second. Widely used in scientific calculations, physics, and engineering.

Kilometers per Hour (km/h):The most commonly used speed unit in daily life, representing the number of kilometers traveled per hour. Used in car speedometers, road speed limit signs, and in China as well as most countries worldwide.

Miles per Hour (mph):An imperial speed unit mainly used in the United States, the United Kingdom, and other countries. 1 mile equals 1.60934 kilometers.

Knot (knot):A speed unit used in maritime and aviation fields. 1 knot equals 1 nautical mile per hour, approximately 1.852 kilometers per hour. A nautical mile is a length unit defined by the Earth's latitude.

Mach (Mach):Represents the ratio of speed to the speed of sound, mainly used for supersonic flight. The Mach number varies with temperature and altitude. The speed of sound at standard sea level (15°C) is about 340.29 m/s.

Speed of Light (c):The speed at which light travels in a vacuum, approximately 299,792,458 meters per second. It is the fastest speed for matter in the universe, used in astronomy and relativistic physics.