Pressure · flow · hydraulics
PSI - GPM Hesaplayıcı
Doğru sistem modeliyle su debisini tahmin edin.
01 System-first models02 Unit-aware inputs03 Assumptions shown04 Practical limits
Calculation desk
Tools organized by the system you are working on
Move from a field measurement to the correct model, then inspect the formula, assumptions, and practical limits.
Pipe systems
Pumps and wells
Fire protection
Irrigation
Pressure washing
Method first
How PSI to GPM works
Identify the system
Choose pipe, nozzle, sprinkler, valve, hose, hydrant, or pump.
Enter physical inputs
Use actual dimensions, differential pressure, and applicable coefficients.
Inspect the result
Review the formula, unit convention, assumptions, and limitations.
Model selection
Choose the right pressure-to-flow method
SystemInformation neededMethod
Long pipePressure, diameter, length, materialHazen-Williams
Open nozzlePressure and opening diameterOrifice discharge
SprinklerPressure and manufacturer K-factorK-factor flow
ValvePressure drop, Cv, specific gravityValve sizing
HydrantPitot pressure, outlet, coefficientHydrant discharge
Editorial standard
Useful answers need visible limits.
Each tool names its model, units, assumptions, and intended use. Treat the result as a practical estimate, then verify safety-sensitive work with the appropriate professional or manufacturer data.
Frequently asked questions
Pressure and flow, clarified
How many GPM is 40 PSI?
There is no single GPM value for 40 PSI. Flow also depends on the pipe, hose, nozzle, valve, sprinkler, or other path the water follows.
Does higher PSI always mean higher GPM?
Within the same unchanged system, increasing pressure generally increases flow. The relationship differs by system model.
Which pressure reading should I use?
Use the pressure difference across the component being modeled. Pipe systems use available pressure loss, hydrants use pitot pressure, and valves use valve pressure drop.
Is US GPM different from Imperial GPM?
Yes. One US gallon is about 3.785 liters, while one Imperial gallon is about 4.546 liters.