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SPEED Units Conversion

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In everyday use and in kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

Speed has the dimensions of distance divided by time. The SI unit of speed is the meter per second, but the most common unit of speed in everyday usage is the kilometer per hour or, in the US and the UK, miles per hour. For air and marine travel the knot is commonly used.

The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum c = 299792458 metres per second (approximately 1079000000 km/h or 671000000 mph).

Units of speed

  • Centimeters Per Hour (cm/h)
  • Centimeters Per Minute (cm/min)
  • Centimeters Per Second (cm/s)
  • Cosmic Velocity First (v1)
  • Cosmic Velocity Second (v2)
  • Cosmic Velocity Third (v3)
  • Earth Velocity (v)
  • Feet Per Hour (ft/h)
  • Feet Per Minute (ft/m)
  • Feet Per Second (ft/s)
  • Furlongs Per Fortnight (f/fn)
  • Inches Per Hour (in/h)
  • Inches Per Minute (in/min)
  • Inches Per Second (in/s)
  • Kilometers Per Hour (km/h)
  • Kilometers Per Minute (km/m)
  • Kilometers Per Second (km/s)
  • Knots (kn)
  • Knots Admiralty (kn[admiralty])
  • Mach Number (M)
  • Meters Per Hour (m/h)
  • Meters Per Minute (m/min)
  • Meters Per Second (m/s)
  • Miles Per Hour (mi/h)
  • Miles Per Minute (mi/m)
  • Miles Per Second (mi/s)
  • Millimeters Per Hour (mm/h)
  • Millimeters Per Minute (mm/min)
  • Millimeters Per Second (mm/s)
  • Speed Of Light (c)
  • Speed Of Light In Air (s[air])
  • Speed Of Light In Vacuum (c[vacuum])
  • Velocity Of Sound In Pure Water (v/soundwater)
  • Velocity Of Sound In Sea Water 20c 10 Meter Deep (v/soundsea)
  • Yards Per Hour (yd/h)
  • Yards Per Minute (yd/min)
  • Yards Per Second (yd/s)

SPEED's unit pairs