Friction Loss Calculator


Enter the hose diameter, hose length & GPM into the friction loss calculator & press "Calculate".

Friction Loss Calculator

256 PSI
200 ft of 5 inch hose with 4000 GPM has 256 PSI friction loss.
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Friction Loss Explained
Friction loss occurs when water passes through a hose. Hose length, diameter, and GPM (volume) all affect friction loss. As water passes through a hose, friction between the water and the inside surface of the hose causes turbulence, which slows the water. The results in a PSI drop (pressure loss) at the other end of the hose. The higher the gpm passing through a hose, the more turbulence and friction loss will result.

Additional Fire Engine Operator Tools
The staff have designed additional fire training tools: strives to provide fire departments & firefighters with quality tools. But, the user takes full responsibility for the information contained above. Use at your own risk!