Plumbing
Plumbing Water Pressure Calculator
Convert between pressure and head, and see what height costs you in PSI.
Result
Static pressure only. This is the pressure with nothing flowing; once water moves, friction in the pipe and through fittings takes more, and that loss grows with the square of the flow.
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About this calculator
What is normal household pressure?
Between 40 and 60 PSI at the fixture. Above about 80 PSI most codes require a pressure-reducing valve, because high pressure wears out valves, hoses and water heaters.
Why is pressure poor upstairs?
Partly height, which costs about 0.43 PSI per foot, so a second floor loses four or five PSI before anything else. The rest is usually friction in undersized or scaled pipe.
Does pipe size change static pressure?
No. Static pressure is the same in a straw and a barrel at the same height. Pipe size affects pressure only once water is flowing.
The formula
pressure lost to height = feet x 0.433 PSI
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