Plumbing
Water Pressure Calculator
Convert between pressure and head height, and work out pressure at a fixture after elevation and friction losses.
Result
Pipe and drain sizing is governed by plumbing code (IPC/UPC or local equivalent) and must be designed and installed by a licensed plumber. This is an educational estimate, not a design. Static pressure should be measured at a hose bib with no flow. Dynamic pressure during flow is always lower.
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About this calculator
How much pressure is lost per floor?
About 0.433 PSI per foot of rise, so roughly 4–5 PSI per storey. A third-floor bathroom starts around 13 PSI down on the ground floor before any friction loss.
What is normal house water pressure?
Typically 40–60 PSI. Above about 80 most codes require a pressure-reducing valve, since high pressure damages fixtures and appliances.
The formula
1 PSI = 2.31 feet of head; elevation loss (PSI) = height × 0.433
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