Estimate water pressure loss through a pipe from flow rate, pipe length, inside diameter, pipe material, fittings, and elevation change. Results include PSI loss, kPa loss, bar loss, feet of head loss, and estimated outlet pressure.
Pipe friction loss:
The calculator estimates friction loss based on water flow, pipe length, inside diameter, roughness, and water viscosity.
Fitting loss:
Use the K value to include elbows, tees, valves, filters, hose bibs, reducers, and other restrictions.
Elevation loss:
Water loses about 0.433 PSI for every foot of vertical rise.
A water pressure loss calculator is useful for plumbing runs, irrigation lines, garden hoses, wells, booster pumps, water supply lines, pressure washers, and checking estimated pressure at an outlet.
This calculator estimates pressure loss. Real systems may need exact pipe data, fixture ratings, pump curves, and professional design.
This calculator estimates water pressure loss with a Darcy-Weisbach style method:
Total Loss = Friction Loss + Minor Loss + Elevation Loss
Water pressure loss is caused by pipe friction, fittings, valves, filters, restrictions, high flow rate, small pipe diameter, and elevation rise.
Fresh water loses about 0.433 PSI for every foot of vertical rise.
Yes. Smaller inside pipe diameter increases water velocity and can greatly increase pressure loss.
Yes. Higher flow rates usually create much higher pipe friction loss and lower outlet pressure.