Estimate shower pressure after pipe friction, fittings, elevation rise, and showerhead loss. Enter starting pressure, shower flow rate, pipe length, pipe size, elbows, valves, and showerhead restriction to estimate outlet PSI.
Starting pressure:
Enter the pressure before the shower branch, such as pressure at the main line, meter, pump, tank, or bathroom supply.
Shower flow and pipe size:
The calculator estimates pipe friction from flow rate, pipe length, pipe diameter, and pipe material.
Shower losses:
It adds losses from elbows, valves, elevation rise, and the showerhead restriction to estimate final outlet pressure.
A shower pressure calculator is useful for bathroom remodels, long pipe runs, low-pressure troubleshooting, well systems, booster pump planning, second-floor showers, and comparing pipe sizes.
This calculator estimates pressure while water is flowing. Static pressure may look higher when the shower is off.
This calculator estimates shower pressure using:
Outlet Pressure = Starting Pressure - Total Pressure Loss
Many showers feel usable around 20 to 45 PSI while flowing, while 45 to 80 PSI is a strong common household range.
Common causes include small pipe, long pipe runs, clogged showerheads, restricted cartridges, partially closed valves, pressure regulators, filters, well settings, or old corroded pipe.
Yes. Smaller pipe can increase pressure loss while the shower is running, especially at higher flow rates or over long pipe runs.
Yes. Water loses about 0.433 PSI for every foot it rises, so upper-floor showers often have lower available pressure.