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Diameter, Velocity and Flow Rate Calculator

Need to calculate the flow rate of water through a specific pipe diameter? With this diameter, velocity and flow rate calculator, you can determine the exact flow rate or velocity at which water will flow through any given pipe.

This calculator may also be used to determine the appropriate pipe diameter required to achieve a desired velocity and flow rate.

The following formula is used by this calculator to populate the value for the flow rate, pipe diameter or water velocity, whichever is unknown:

V = 0.408 × Q/D2

V = Water Velocity; Q = Flow Rate; D = Pipe Diameter

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Flow Rate Calculator

1. Fill in known values for any two fields below. 2. Press the “Calculate” button next to the unknown field.

gal/min
inches
ft/s

Results

Flow Rate
0
gal/min
Pipe Diameter
0
in
Water Velocity
0
ft/s
 

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WaterProfessionals® offers a comprehensive suite of industrial water treatment services and equipment, such as water purification, water filtration, process wastewater treatment, wastewater reclaim/recycle and more, for pharmaceutical, medical, industrial, governmental and commercial businesses.

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