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

 kilometres per hour [km/h]kilometres per minute [km/min]kilometres per second [km/s]metres per hour [m/h]metres per minute [m/min]metres per second [m/s]miles per hour [mph]miles per minute [mpm]miles per second [mps]foot per hour [fph]foot per minute [fpm]foot per second [fps]inch per hour [iph]inch per minute [ipm]inch per second [ips]furlong per fortnightspeed of light in vacuum [c]speed of sound in airmach [M]knot [kn] 0123456789

# metric

 Unit Symbol Symbol(plain text) Value kilometres per hour $\frac{km}{h}$ km/h 1 kilometres per minute $\frac{km}{min}$ km/min 0.016666667 kilometres per second $\frac{km}{s}$ km/s 0.000277778 metres per hour $\frac{m}{h}$ m/h 1000 metres per minute $\frac{m}{min}$ m/min 16.666666667 metres per second $\frac{m}{s}$ m/s 0.277777778

# british-american

 Unit Symbol Symbol(plain text) Value miles per hour $mph$ mph 0.621371192 miles per minute $mpm$ mpm 0.010356187 miles per second $mps$ mps 0.000172603 foot per hour $fph$ fph 3280.83989501 foot per minute $fpm$ fpm 54.680664917 foot per second $fps$ fps 0.911344415 inch per hour $iph$ iph 39370.0787402 inch per minute $ipm$ ipm 656.167979003 inch per second $ips$ ips 10.936132983 furlong per fortnight  1670.24576473

# other

 Unit Symbol Symbol(plain text) Value speed of light in vacuum $c$ c 9.265669311×10-10 speed of sound in air  0.000807494 mach $M$ M 0.000839208 knot $kn$ kn 0.53995727

# 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.:
$\vec{v} = \frac{\vec{dr}}{dt}$
where:
• $\vec{v}$ is velocity vector,
• $\vec{r}$ is position vector,
• $t$ 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:
$\frac{m}{s}$
• 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:
$E=mc^2$

• 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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