 Online Calculators

# Speed Conversion Calculator

Convert Speed or Velocity

a real number or scientific notation

## 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. 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" at https://www.calculatorsoup.com/calculators/conversions/speed.php from CalculatorSoup, https://www.calculatorsoup.com - Online Calculators