Accuracy number of significant decimal digits

Speed Converter

Miles per hour [mph][mi/h]
Miles per second [mps][mi/s]
Yards per second [yps][yd/s]
Feet per second [fps][ft/s]
Kilometers per hour [km/h][kmh][kph][kmph]
Kilometers per second [km/s]
Meters per second [m/s]
Knot [kn][kt] nautical mile per hour
Mach Speed [Ma] (speed of sound)
Light Speed [c]

August 16, 2009 Berlin Atletic Championship - Usain Bolt breaks his own world record. He ran 100m in 9.58 seconds !!!. His average speed was 10.4384 m/s.

August 20, 2009 Berlin Atletic Championship - Usain Bolt breaks his own world record. He ran 200m in 19.19 seconds !!!. His average speed was 10.4221 m/s.

Usain Bolt speed during the 200m sprint race : 10.3627 m/s.

Note, average speed in this race was faster then 100m sprint race speed (10.3199 m/s)

Wayde van Niekerk South African sprinter set a new World Record at Rio 2016 Olympics. On August 14th, 2016 Niekerk ran 400m in 43.03s. His averege speed during this race was 9.2958m/s.

The current world record holder of the 400 m sprint race is Michael Johnson, USA. The record has been broken August 26, 1999 in Seville, Spain. Johnson ran 43.18s.

His average speed during the winning 400m race: 9.2635 m/s

Speed limit in built-up areas in most countries of Europe (Poland - 60 km/h, UK - 48 km/h)

Speed limit outside built-up areas in most countries of EU (European Union)

Speed limit on motorways (highways) in most countries of Europe

The speed of sound depends on the properties of the medium through which it travels. In dry air at 59°F (15°C) at the sea level it is equal to 1 Ma (Mach 1 = 1225km/h = 761mph)

Escape Velocity is the speed needed to "break free" from a gravitational field of the object (Earth, Sun etc.). The speed needed to leave gravitational field of the Earth is about 11.19 km/s = 25031 mph

The speed of light depends on the properties of the medium through which it travels. For example, speed of light in water equals about 3/4 of c. The speed of the light in perfect vacuum equals c = 299,792,458 m/s = 670,616,629 mph

Cheetah (

Typical space shuttle speed on its way back to Earth during atmospheric reentry is about 17,500mph

mph vs. kph (km/h) Example

If your speed or velocity is given in miles per hour (mph) and you want to
translate it into kilometers per hour (km/h) type your mph value into edit box labeled
'miles per hour'. Convertion will start automatically as you type, translated
value in km/h will be displayed in the edit box labeled 'Kilometers per hour'.
On the other hand, km/h to mph conversion starts when you type value of km/h in the edit
box labeled 'kilometers per hour'.

Fundamental unit of speed in the International System Of Units (SI) is meter per second [m/s]

Unit | In meters per second |
---|---|

Kilometer per hour [km/h] | 0.27(7) |

Mile per hour [mph] | 0.44704 |

Meter per second [m/s] | 1 |

Foot per second [fps] | 0.3048 |

Knot [kn][kt] | 0.514(4) |

Mach Speed [Ma] | 340.27(7) |

Speed of light travel [c] | 299792458 |