PSI to GPM Flow Rate

PSI
in
Conversion

Estimate flow rate through an orifice given pressure (Torricelli simplified model).

Formula

GPM ≈ 0.4085 × D² × √(2.307 × PSI)
  • Simplified orifice flow. Actual flow depends on Cd (discharge coefficient), pipe friction, and fittings.
  • 1 PSI = 2.307 ft of water head.

PSI to GPM Flow Rate Example

Inputs
  • Pressure: 40 PSI
  • Orifice Diameter: 0.5 in

0.4085 × 0.25 × √(92.28) ≈ 0.98 GPM

Frequently asked questions

How do I use the PSI to GPM Flow Rate?
Enter the value in the input field and the result updates immediately.
How accurate is this converter?
Uses internationally recognised conversion factors. Results are rounded to the displayed decimal places.
Can I verify this manually?
Yes — apply the formula shown above step by step.