Velocity units converter
Speed (velocity) units converter - converts units between metric (kilometres per hour, meters per second and many more), british-american (miles per hour, foot per second and many more), nautical (knots) and some other (machs, speed of light etc.)

Inputs data - value and unit, which we're going to convert#

Value
Unit
Decimals

#

metric#

UnitSymbolSymbol
(plain text)
ValueNotes
kilometres per hourShow sourcekmh\frac{km}{h}km/h1A velocity unit commonly used to measure the speed of land vehicles such as cars or trains. The vehicle moves at a speed of one kilometer per hour if it covers distance of one kilometre (1000 m) within one hour.1 kmh=1000 m60 min=1000 m3600 s=1036 ms1\ \frac{km}{h} = \frac{1000\ m}{60\ min} = \frac{10\cancel{00}\ m}{36\cancel{00}\ s} = \frac{10}{36}\ \frac{m}{s}
kilometres per minuteShow sourcekmmin\frac{km}{min}km/min0.016666667The derived unit of speed created by dividing length unit kilometer (km) and time unit minute (min). The body moves at a speed of one kilometer per minute if it travels a distance of one kilometer(1000 m) within one minute (60 s).1 kmmin=1000 m60 s=1006ms=16 23 ms1\ \frac{km}{min} = \frac{100\cancel{0}\ m}{6\cancel{0}\ s} = \frac{100}{6} \frac{m}{s} = 16\ \frac{2}{3}\ \frac{m}{s}
kilometres per secondShow sourcekms\frac{km}{s}km/s0.000277778The derived unit of speed created by dividing length unit kilometer (km) and time unit second (s). The body moves at a speed of one kilometer per second if it travels a distance of one kilometer (1000 m) within one second.1 kms=1000 m1 s=1000 ms1\ \frac{km}{s} = \frac{1000\ m}{1\ s} = 1000\ \frac{m}{s}
metres per hourShow sourcemh\frac{m}{h}m/h1000The derived unit of speed created by dividing length unit metre (m) and time unit hour (60 min). The body moves at a speed of one one metre per hour if it travels a distance of one meter (100 cm) within one hour (60 min).1 mh=1 m60 min=1 m3600 s=13600 ms1\ \frac{m}{h} = \frac{1\ m}{60\ min} = \frac{1\ m}{3600\ s} = \frac{1}{3600}\ \frac{m}{s}
metres per minuteShow sourcemmin\frac{m}{min}m/min16.666666667The derived unit of speed created by dividing length unit metre (m) and time unit minute (60 s). The body moves at a speed of one one metre per minute if it travels a distance of one meter (100 cm) within one minute (60 s).1 mmin=1 m60 s=160 ms1\ \frac{m}{min} = \frac{1\ m}{60\ s} = \frac{1}{60}\ \frac{m}{s}
metres per secondShow sourcems\frac{m}{s}m/s0.277777778Basic speed unit in the SI system. It was created by dividing length unit meter (m) and time unit second (s). The body moves at a speed of one meter per second if it covers a distance of one meter in one second (100 cm)

british-american#

UnitSymbolSymbol
(plain text)
ValueNotes
miles per hourShow sourcemphmphmph0.621371192A speed unit commonly used in Anglo-Saxon countries. The vehicle moves at a speed of one mile per hour if it covers a distance of one mile (1 mi) within one hour.1 mph=1 mi60 min=1 mi3600 s=13600 mps1\ mph = \frac{1\ mi}{60\ min} = \frac{1\ mi}{3600\ s} = \frac{1}{3600}\ mps
miles per minuteShow sourcempmmpmmpm0.010356187The derived unit of speed created by dividing length unit mile (mi) and time unit minute (min). The body moves at a speed of one mile per minute if it travels a distance equal to one mile (1 mi) within one minute (60 s).1 mpm=1 mi1 min=1 mi60 s=160 mps1\ mpm = \frac{1\ mi}{1\ min} = \frac{1\ mi}{60\ s} = \frac{1}{60}\ mps
miles per secondShow sourcempsmpsmps0.000172603The derived unit of speed created by dividing length unit mile (mi) time unit second (s). The body moves at a speed of one mile per second if it travels a distance equal to one mile (1 mi) within one second.1 mps=1 mi1 s=1 mis1\ mps = \frac{1\ mi}{1\ s} = 1\ \frac{mi}{s}
foot per hourShow sourcefphfphfph3280.83989501The derived unit of speed created by dividing length unit foot (ft) time unit second (s). The body moves at a speed of one foot per second if it travels a distance equal to one foot (1 ft) within one second.1 fps=1 ft1 s=1 fts1\ fps = \frac{1\ ft}{1\ s} = 1\ \frac{ft}{s}
foot per minuteShow sourcefpmfpmfpm54.680664917The derived unit of speed created by dividing length unit foot (ft) and time unit minute (min). The body moves at a speed of one foot per minute if it travels a distance equal to one foot (1 ft) within one minute (60 s).1 fpm=1 ft1 min=1 ft60 s=160 fps1\ fpm = \frac{1\ ft}{1\ min} = \frac{1\ ft}{60\ s} = \frac{1}{60}\ fps
foot per secondShow sourcefpsfpsfps0.911344415The derived unit of speed created by dividing length unit foot (ft) time unit second (s). The body moves at a speed of one foot per second if it travels a distance equal to one foot (1 ft) within one second.1 fps=1 ft1 s=1 fts1\ fps = \frac{1\ ft}{1\ s} = 1\ \frac{ft}{s}
inch per hourShow sourceiphiphiph39370.0787402The derived unit of speed created by dividing length unit inch (in) time unit second (s). The body moves at a speed of one inch per second if it travels a distance equal to one inch (1 in) within one second.1 ips=1 in1 s=1 ins1\ ips = \frac{1\ in}{1\ s} = 1\ \frac{in}{s}
inch per minuteShow sourceipmipmipm656.167979003The derived unit of speed created by dividing length unit inch (in) and time unit minute (min). The body moves at a speed of one inch per minute if it travels a distance equal to one inch (1 in) within one minute (60 s).1 ipm=1 in1 min=1 in60 s=160 ips1\ ipm = \frac{1\ in}{1\ min} = \frac{1\ in}{60\ s} = \frac{1}{60}\ ips
inch per secondShow sourceipsipsips10.936132983The derived unit of speed created by dividing length unit inch (in) time unit second (s). The body moves at a speed of one inch per second if it travels a distance equal to one inch (1 in) within one second.1 ips=1 in1 s=1 ins1\ ips = \frac{1\ in}{1\ s} = 1\ \frac{in}{s}
furlong per fortnightShow source--1670.24576473Unit of speed in the furlong-firkin-fortnight system (FFF). FFF units were created for humorous purposes and the they are intentionally impractical to use. The body moves at the speed of one furlong per fortnight (furlong per two weeks) if it travels a distance equal to one furlong (1 fur) within two weeks.1 fur2 tyg.=1/8 mi14 dni=1/8 mi14×24 h=12688 mph1\ \frac{fur}{2\ tyg.} = \frac{1/8\ mi}{14\ dni} = \frac{1/8\ mi}{14 \times 24\ h} = \frac{1}{2688}\ mph

other#

UnitSymbolSymbol
(plain text)
ValueNotes
speed of light in vacuumShow sourceccc9.265669311×10-10The speed of light in a vacuum. Because it is the highest speed possible to achieve in nature, the speed given in this unit is always fractional (less or equal to one). 1 c=299792458 ms1\ c = 299 792 458\ \frac {m}{s}
speed of sound in air (20°C, 1 atm)Show source--0.000807494The speed at which an acoustic wave travels in the air at temperature 20°C, under pressure of 1 atmosphere, which corresponds to three hundred and forty four meters per second. Vsound air, 20°C, 1 atm.=344 msV_{\text {sound air, 20°C, 1 atm.}} = 344\ \frac{m}{s}
machShow sourceMMM0.000839208A speed unit used among others in the aircraft. The body moves at the speed of one mach, if the acoustic wave traveling in the same medium would have the same speed. The speed of one mach in air at 15°C corresponds to 340.3 meters per second. 1 M(air, 15°C)=340.3 ms1\ M \text{(air, 15°C)} = 340.3\ \frac{m}{s}
knotShow sourceknknkn0.53995727A speed unit used in sea transport and in some countries in aircraft. One knot corresponds to the speed of one nautical mile per hour.1 kt=1 inmh=1 inm1h=1852 mh1\ kt = 1\ \frac{inm}{h} = \frac{1\ inm}{1 h} = 1852\ \frac{m}{h}

Some facts#

  • Velocity is a vector size.
  • It specifies the change of the position vector in time. The concept of velocity was formalized with the development of calculus. Since then, the velocity is defined as the position vector derivative with time i.e.:
    v=drdt\vec{v} = \dfrac{\vec{dr}}{dt}
    where:
    • v\vec{v} is velocity vector,
    • r\vec{r} is position vector,
    • tt is time.
  • In common parlance - when we use the word speed - we normally refer to the scalar size, representing the value of the velocity vector (its "length").
  • The velocity by definition only applies to singl point in time. Sometimes, in order to emphasize this fact (and rule out a possible confusion with the average speed) it is called instantaneous velocity.
  • There is also concept of average velocity, which is ratio of distance to time, in which this distance has been traveled.
  • Average velocity is sometimes colloquially called speed, but it is not a phrase used by physicists.
  • The basic unit of velocity in the SI system is meter per second:
    ms\dfrac{m}{s}
  • According to Einstein's theory of relativity the highest attainable speed in nature is the speed of light amounting to 299 792 458 m/s.
    • The speed of light constant exists in many physical formulas e.g. equation desribing the equivalence of energy and mass:
      E=mc2E=mc^2

    • Einstein's special theory of relativity gives a more general sense of the speed of light as limit velocity of energy transport (or otherwise velocity of impact) in the universe..
    • The light is electromagnetic wave with the frequency that is visible to the human eye. However, the speed of light concerns to all of electromagnetic waves and does not depend on their frequency. This means that for example radio or wifi signals are transmited with the speed of light.

  • Other common velocity constants are for example:
    • First cosmic velocity - the smallest horizontal velocity to be given to the body relative to the celestial body attracts them to the body is moved along a closed orbit. In other words, it is the speed needed to became a satellite.
    • Second cosmic velocity - the velocity needed to "break free" from the gravitational attraction of the given orb (for example Earth)..
    • Third cosmic velocity - the initial velocity which a body has to have to leave the Solar System.
    • Fourth cosmic velocity - the initial velocity needed to leave the Milky Way.

How to convert#

  • Enter the number to field "value" - enter the NUMBER only, no other words, symbols or unit names. You can use dot (.) or comma (,) to enter fractions.
    Examples:
    • 1000000
    • 123,23
    • 999.99999
  • Find and select your starting unit in field "unit". Some unit calculators have huge number of different units to select from - it's just how complicated our world is...
  • And... you got the result in the table below. You'll find several results for many different units - we show you all results we know at once. Just find the one you're looking for.

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