Friction Loss Calculator
Enter the hose / pipe diameter, the gallons per minute (GPM), and the length into the Friction Loss Calculator. Press the submit button to calculate.
Select Diameter From List
Enter GPM (Gallons Per Minute):
Hose Length (Feet)
Friction Loss Results (PSI):
Friction Loss Calculations Explained:
Friction loss occurs when water passes through a hose or pipe. Distance, diameter, and the GPM / volume, all affect friction loss. As water passes through the hose / pipe, friction between the water and the inside surface of the hose / pipe causes turbulence. This turbulence reduces the energy produced by the pump (PSI). As a result, the PSI at the other end of the hose will be lower. The higher the GPM passing through a hose or pipe, the more turbulance and friction loss will result.