Pipe Flow Calculator

Enter the pipe diameter, pipe material, pipe length, and total elevation change to calculate the flow velocity and mass flow rate of a gravity fed pipe flow.

Pipe Flow Formula

The following formula is used to calculate the volumetric flow of water through a pipe of certain diameter length and height.

v = k * C * R0.63 * S0.54

  • Where k is a constant (.849)
  • C is the roughness coefficient (dependent on material of pipe)
  • R is the hydraulic radius
  • S is the slope of the pipe
  • v is the velocity of water (m/s)

From this, the mass flow rate can be determine through multiplying the volume flow rate times the density.

m= p * v

  • Where p is the density of the fluid
  • v is the volumetric flow rate
pipe flow calculator