What does the PSI to GPM Orifice Flow Calculator do?
It applies the stated engineering conversion or estimation formula to the values you enter.
PSI to GPM Orifice Flow Calculator
Estimate water flow through a circular orifice from its diameter and pressure difference.
Estimate water flow
Enter the orifice diameter in inches and pressure drop in psi.
About this converter
How to use PSI to GPM Orifice Flow Calculator, plus the formulas and logic behind the results.
Tool description
This educational calculator estimates water flow using a common simplified circular-orifice approximation.
How to use
- Enter the known value in the first field.
- Choose the source and destination units when unit menus are shown.
- Select Calculate to run the conversion.
- Review the main result and any supporting equivalents.
Formulas & reference
GPM ≈ 19.65 × d(in)² × √ΔP(psi)
Calculation logic
The diameter is squared and multiplied by the square root of pressure drop and the empirical water-flow coefficient 19.65.
Estimate only. Real flow depends on discharge coefficient, geometry, water conditions, pipe losses, and measurement location.
PSI to GPM Orifice Flow Calculator FAQ
Common questions about this conversion and how to interpret the result.
Can I enter decimal values?
Yes. Decimal and whole-number inputs are supported.
Can I use negative values?
Unit conversions can represent signed values. Physical estimates may require non-negative inputs as noted.
How precise are the results?
Calculations use the constants shown in the formula section; displayed values may be rounded.
Are the results suitable for engineering design?
Use them for reference and education. Confirm safety-critical work with applicable standards and qualified engineers.
Is this calculator free to use?
Yes. It can be used without registration.