How Orifice Flow Rate Calculator Works
Estimate liquid flow through an orifice from discharge coefficient, area, pressure head and fluid density. The calculation runs locally in your browser, so values entered into this calculator are not sent to a server by the calculator.
For an idealized liquid orifice, Q = Cd × A × √(2gh). The result depends on the chosen discharge coefficient and assumes the pressure head is expressed as metres of the flowing liquid.
How to use it
- Enter measured or verified values using the units shown.
- Calculate the result and test alternative assumptions when comparing scenarios.
- For engineering, commercial or safety-critical decisions, verify the result against applicable standards, manufacturer data and professional review.
Common mistakes
- Mixing units or entering dimensions in the wrong unit.
- Using an estimated property where a project-specific value is required.
- Treating a preliminary calculation as a final design, compliance or safety approval.
Limitations
This calculator provides a preliminary mathematical estimate. Real-world results can be affected by tolerances, material properties, installation conditions, environmental factors, applicable standards and manufacturer requirements.