Construction
Pipe Pressure Loss Calculator
Water loses pressure to friction as it flows. Long runs and small pipes mean weak showers and pump-killer head loss.
Pressure loss (PSI)
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- Velocity (ft/s)
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- Loss per 100 ft
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- OK for residential?
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FAQ
How much loss is acceptable? +
Under 10 PSI total for a residential branch is comfortable. Above that, showers feel weak when other fixtures run.
Why does material matter? +
New PEX/copper are smooth (C=150). Old galvanized scales up (C=70-80), causing 4-5x more loss for the same pipe size.