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Speed Conversion Calculator

Convert Speed or Velocity

a real number or scientific notation
Answer:


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Calculator Use

Speed is the rate of change in position of an object, regardless of direction of travel. Walk forward or backward at 2 meters per second, and your speed is just that: 2 m/s. Velocity is speed in the context of direction. Say you were walking backward again; your velocity is negative 2 m/s, although your speed is still positive.

Shows the difference between speed and velocity. Speed does not factor direction, but velocity does.

For most science applications, the SI unit for speed and velocity is meters per second (m/s), although kliometers per hour (km/h) is sometimes used when measuring the speed of vehicles. The English system usually expresses speed as miles per hour (mph) or sometimes feet per second (ft/s), while marine vessels typically use knots, or nautical miles per hour.

How to Convert Units of Speed

Conversions are performed by using a conversion factor. By knowing the conversion factor, converting between units can become a simple multiplication problem:

S * C = E

Where S is our starting value, C is our conversion factor, and E is our end converted result.

To simply convert from any unit into meters per second, for example, from 5 mph, just multiply by the conversion value in the right column in the table below.

5 mph * 0.44704 [ (m/s) / (mph) ] = 2.2352 m/s

To convert from m/s into units in the left column divide by the value in the right column or, multiply by the reciprocal, 1/x.

2.2352 (m/s) / 0.44704  [ (m/s) / (mph) ] = 5 mph

To convert among any units in the left column, say from A to B, you can multiply by the factor for A to convert A into meters per second then divide by the factor for B to convert out of meters per second.  Or, you can find the single factor you need by dividing the A factor by the B factor.

For example, to convert from miles per hour to kilometers per hour you would multiply by 0.44704 then divide by 0.2777778.  Or, multiply by 0.44704/0.27777778 = 1.6093439. So, to convert directly from mph to km/h (kph), you multiply by 1.6093439.

Units, symbols and conversion values
used in this speed calculator
To Convert from
Unit
Unit
Symbol
and Convert to
( m/s2 or m/(s·s) )
Multiply by
( m/s 2 / Unit )
centimeter per minute
cm/min
meter per second
0.0001667
centimeter per second
cm/s
meter per second
0.01
foot per hour
ft/h
meter per second
8.46667E-05
foot per minute
ft/min
meter per second
0.00508
foot per second
ft/s
meter per second
0.3048
inch per minute
in/min
meter per second
0.000423333
inch per second
in/s
meter per second
0.0254
kilometer per hour
km/h (kph)
meter per second
0.2777778
kilometer per second
km/s
meter per second
1000
knot (nautical mi/h)
kn
meter per second
0.5144444
knot (UK)
kn
meter per second
0.5148
meter per hour
m/h
meter per second
0.0002777778
meter per minute
m/min
meter per second
0.01667
meter per second
m/s
meter per second
1
mile per hour
mi/h (mph)
meter per second
0.44704
mile per minute
mi/min
meter per second
26.8224
mile per second
mi/s
meter per second
1609.344
speed-of-light (vacuum)
c
meter per second
299792458
yard per hour
yd/h
meter per second
0.000254
yard per minute
yd/min
meter per second
0.01524
yard per second
yd/s
meter per second
0.9144

References/ Further Reading

The National Institute of Standards and Technology (NIST) - The NIST Guide for the use of the International System of Units - Appendix B, subsections B.8 Factors for Units Listed Alphabetically and B.9 Factors for units listed by kind of quantity or field of science.

Lide, David R., Daniel (Editor-in-Chief). CRC Handbook of Chemistry and Physics, 89th Edition New York, NY: CRC Press, p. 1-28, 2008.

Wikipedia contributors. "Conversion of units" Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, last visited 26 Jun. 2011.

How Many? A dictionary of units of measurement at http://www.unc.edu/~rowlett/units/



 

Cite this content, page or calculator as:

Furey, Edward "Speed Conversion Calculator"; from http://www.calculatorsoup.com - Online Calculator Resource.

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