Water Pressure Loss Calculator
Estimate friction loss through a pipe run at a given flow rate. Enter flow, length, pipe material and size to get loss in psi and feet of head, plus the flow velocity with a high-velocity warning.
Flow & Pipe
Add fittings as equiv. length
Friction Loss
Total Loss11.18 psi
Head Loss25.8 ft
Loss per 100 ft25.8 ft
Velocity6.63 fps
✓ Velocity 6.63 fps is within the usual ≤8 fps target
Hazen-Williams estimate. Add fitting equivalent lengths to the run for a fuller number.
Uses the Hazen-Williams formula for water in pressure pipe. Add the equivalent length of fittings and valves to the run for a fuller estimate. 1 ft of head ≈ 0.433 psi.
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