This pipe velocity calculator allows you to compute the pipe velocity which is the speed in which a certain flow rate goes through a pipe at a certain diameter. You can read more on this subject and discover the transformations used below the form.

Instruction: Please input only two fields from the three below!

Flow rate:*

How does this pipe velocity calculator work?

This is a useful tool to use whenever you need to calculate one of the components in the pipe velocity equation. All you need to do is input two of the three values, for example diameter and flow rate to retrieve the third, in this case velocity. For your convenience there are plenty of measurement units you can choose from and there is no need to respect the same unit for both values because the pipe velocity calculator will do all the necessary transformations.

What is special about this tool is that not only it offers you the third component of the equation but also shows you what that value means in the other units available. For instance, if you calculate flow rate you will receive your answer in m3/s, m3/h, in3/s, in3/g, ft3/s and ft3/h.

Example calculation

Let’s take a case in which the velocity is searched based on flow rate of 15 m3/s and diameter of 0.5 m:

The velocity value for the above pipe velocity equation is 76.39443721173036 m/s. This is equal to:

■ 275,019.973962229 m/h

■ 0.0763944372117303 km/s

■ 275.019973962229 km/h

■ 250.637917360317 ft/s

■ 902296.502497143 ft/s

Equations and transformations used:

Flow rate = ¼ * π * diameter2 * velocity

1 m3/h = 0.00027777777778 m3/s

1 in3/s= 0.000016387064236 m3/s

1 in3/h= 4.5519622878e-9 m3/s

1 ft3/s= 0.028316847 m3/s

1 ft3/h= 0.0000078657908333 m3/s

Diameter = square root out of (4 * flow rate) / (π * velocity)

1 mm= 0.001 m

1 cm= 0.01 m

1 in= 0.0254 m

1 ft= 0.3048 m

Velocity = 4 * flow rate / π * diameter2

1 m/h= 0.00027777777778 m/s

1 km/s = 1000 m/s

1 km/h=  0.27777777778 m/s

1 in/s= 0.025 4 m/s

1 in/h= 0.0000070555555556 m/s

1 ft/s= 0.304 8 m/s

1 ft/h= 0.000084666666667 m/s

What is pipe velocity?

This represents the speed of a fluid in the pipe and what needs to be taken in consideration is that this speed is not uniform across the section area so usually a mean is calculated to offer a continuity result or a steady flow. A practical application of this concept is the water flow in pipes.

28 Mar, 2015