Water Flow Rate Calculator

Enter the water velocity and diameter of the pipe into the calculator. The calculator will evaluate the volume flow rate of the water moving through the pipe.

Water Flow Rate Calculator

The following equation is used to calculate the volume flow rate of water moving through a pipe given the velocity and pipe diameter.

Q = D2 x V / .408

  • Where Q is the volume flow rate in gal/min
  • D is the diameter in in
  • V is the velocity ft/s

What is water flow rate?

Water flow rate is typically either a rate of mass or volume of water that is moving through a pipe. In this case the equation above solves for galons per minute.

water flow rate calculator

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