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Speed Converter

Type value
Select the unit Select decimal length  
inches /secmm / sec
inches /min centimetres/sec
inches/hour cm / min
feet / sec metres / sec
feet / min metres / min
feet / hour metres / hour
feet / day metres / day
miles / sec km / sec
miles / min km / min
miles / hour km / hour
miles / day km / day
knots Mach

Speed unit conversion table

Name of unitSymbolDefinitionRelation to SI units
footper hourfph≡ 1 ft/h= 8.4 6×10 −5 m/s
footper minutefpm≡ 1 ft/min= 6997508000000000000♠5.08 ×10 −3 m/s
footper secondfps≡ 1 ft/s= 6999304800000000000♠3.048 ×10 −1 m/s
furlongper fortnight ≡ furlong/fortnight≈ 6996166309500000000♠1.663 095×10 −4 m/s
inchper houriph≡ 1 in/h= 7.0 5×10 −6m/s
inch per minuteipm≡ 1 in/min= 4.2 3×10 −4m/s
inch per secondips≡ 1 in/s= 6998254000000000000♠2.54 ×10 −2 m/s
kilometre per hourkm/h≡ 1 km/h= 2. 7×10 −1 m/s
knotkn≡ 1 nmi/h = 1.852 km/h= 0.51 4 m/s
knot(Admiralty)kn≡ 1 NM (Adm)/h = 6999514773333333333♠1.853 184 km/h[ citation needed]= 6999514769999999999♠0.514 773 m/s
mach numberMRatio of the speed to the speed of sound [note 1]in the medium (unitless).≈ 340 to 295 m/s
metre per second(SI unit)m/s≡ 1 m/s= 1 m/s
mile per hourmph≡ 1 mi/h= 6999447040000000000♠0.447 04 m/s
mileper minutempm≡ 1 mi/min= 7001268223999999999♠26.8224 m/s
mile per secondmps≡ 1 mi/s= 7003160934400000000♠1 609.344 m/s
speed of lightin vacuumc≡ 7008299792458000000♠299 792458 m/s= 7008299792458000000♠299 792458 m/s
speed of soundin airs7003122500000000000♠1225to 7002295000000000000♠1062 km/h(761–660 mph or 661–574 kn) [note 1]≈ 7002340000000000000♠340 to 295 m/s
Note
  1. ^ Jump up to:abThe speed of sound varies especially with temperature and pressure from about 7002340277777777777♠1225 km/h(761 mph or 661 kn)
    in air at sea level to about 7002295000000000000♠1062 km/h(660 mph or 570 kn) at jet altitudes ( 12 200 m or 40 000 ft).