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Speed Converter – 7 units of speed

Convert speed between km/h, mph, m/s, kn, Mach, ft/s and more – exact and instant.

1 km/h = 0.6213711922 mph

Formula: mph = km/h ÷ 1.609344

Common values
Decimals
In every unit 7 units
Meter per second (m/s) 0.2777777778 m/s
Kilometer per hour (km/h) 1 km/h
Mile per hour (mph) 0.6213711922 mph
Knot (kn) 0.5399568035 kn
Foot per second (ft/s) 0.9113444153 ft/s
Mach (Mach) 0.0008162876153 Mach
Speed of light (c) 9.265669311 × 10⁻¹⁰ c

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If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 6 hours so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Calculated in your browser – nothing you type is sent anywhere. Privacy details

Units of speed

Meter per second (m/s)SI (metric) unit
Kilometer per hour (km/h)metric unit accepted with the SI1 km/h = 0.2777777778 m/s
Mile per hour (mph)imperial and US customary unit1 mph = 0.44704 m/s
Knot (kn)nautical unit1 kn = 0.5144444444 m/s
Foot per second (ft/s)imperial and US customary unit1 ft/s = 0.3048 m/s
Mach (Mach)unit1 Mach = 340.294 m/s
Speed of light (c)unit1 c = 299,792,458 m/s

How to use: Speed Converter

  1. 1 Pick the unit you have and the unit you need.
  2. 2 Type the value – the result in the other unit appears at once (type in the result field to convert back).
  3. 3 Use a common value, set the decimals or swap the units with one click.
  4. 4 Open “In every unit” to see the value in all 7 units of speed.

About this tool

Speed is distance travelled per unit of time. Road speeds are given in kilometres per hour or miles per hour, wind and ships in knots, physics in metres per second.

Here every value is converted through the meter per second (m/s). Choose any two of the 7 units below the converter, or start from one of the popular conversions.

Calculated in your browser – nothing you type is sent anywhere.

Frequently asked questions

Which units of speed can I convert?

Meter per second (m/s), Kilometer per hour (km/h), Mile per hour (mph), Knot (kn), Foot per second (ft/s), Mach (Mach) and Speed of light (c).

Which speed conversions are used most?

1 km/h = 0.6213711922 mph; 1 km/h = 0.2777777778 m/s; 1 kn = 1.852 km/h; 1 kn = 1.150779448 mph; 1 mph = 0.44704 m/s; 1 Mach = 1,225.0584 km/h.

How exact is the converter?

Each unit is defined by its official value in m/s, so conversions are exact up to the 10 significant digits shown; you can round to 0–6 decimals.

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