PSI to GPM Converter

Form

psi
psi
in

Results

Flow rate in gpm

0

Table of Contents

1

What is PSI to GPM?

This page estimates water flow from pressure difference and a pipe-diameter assumption.

2

How to Use This Calculator

  1. Enter or select Pressure inside the tank, Pressure at the exit, Diameter of the pipe.
  2. Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
  3. Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
3

Formula Used

GPM = 29.84 × diameter(in)² × √(pressure difference in psi)
4

Variables Explained

InputWhat it means
Pressure inside the tankUse the measured or stated value for this item, with the unit or category shown beside the field.
Pressure at the exitUse the measured or stated value for this item, with the unit or category shown beside the field.
Diameter of the pipeDistance across a circle through its center; twice the radius.
5

Worked Example

A 1 in diameter and 4 psi pressure difference give 59.68 GPM under this idealized equation.

6

Why Use This Calculator?

Use the result to put measurements on a common basis before comparing them or estimating quantities. The original measurement precision still limits the precision of the answer.

7

Common Mistakes

    • Real pipe flow also depends on length, fittings, roughness and losses; pressure alone cannot fix actual flow.
8

Frequently Asked Questions

When should I round a measurement?

Carry the measured values and conversion factors through the calculation first. Round the final result to a precision justified by the original measurements.

Why can a supplier’s quantity differ?

Measurement conventions, nominal sizes, density assumptions and purchase rounding can change a practical quantity. Compare the units and assumptions before comparing the numbers.

9

Sources & References

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