Inputs
- Orifice diameter
- Upstream pressure
- Downstream pressure
- Air temperature
- Discharge coefficient
Orifice flow
Air Flow Through Orifice Calculator
Estimate compressed-air flow through a round orifice from diameter, upstream pressure, downstream pressure, temperature, and discharge coefficient.
Orifice flow
Run the calculation
Estimate compressed-air flow through a round orifice from diameter, upstream pressure, downstream pressure, temperature, and discharge coefficient.
Engineering visual
Air Orifice Flow Calculator calculation map
Upstream pressure drives flow through the valve restriction to downstream pressure. The restriction and pressure drop are shown at the component where they occur.
- 01Orifice diameter
- 02Calculate and compare
- 03Flow in SCFM
Calculation reference
What this tool checks.
The calculator uses a simplified compressible-air equation and indicates whether the flow is choked for the entered pressure ratio.
Outputs
- Flow in SCFM
- Flow in L/min
- Flow state
- Pressure ratio
Engineering guide
Use the result with the right context.
Calculate air orifice flow calculator from application data and interpret the result for preliminary pneumatic engineering review.
Enter the known application values, including Orifice diameter, Upstream pressure, Downstream pressure.
Run the calculation using one consistent set of units and reference conditions.
Review Flow in SCFM, Flow in L/min, Flow state, then compare the result with the component datasheet and application margin.
Treat catalog flow coefficients and conductance values as component-specific data measured under stated reference conditions.
Validate tubing, fittings, silencers, manifolds, temperature, and simultaneous demand as part of the complete flow path.
How the Air Orifice Flow Calculator works
This calculator turns Orifice diameter, Upstream pressure, Downstream pressure into Flow in SCFM, Flow in L/min, Flow state. The governing relationship remains visible in the dedicated formula area so the result can be checked against a worksheet, supplier data, or measured machine values.
How to interpret the result
Use the output as a transparent first-pass engineering estimate, not an automatic product approval. Compare the calculated value with available catalog ratings, transient conditions, installation losses, service environment, and a safety margin appropriate to the machine risk.
Limits and verification
Treat catalog flow coefficients and conductance values as component-specific data measured under stated reference conditions. Validate tubing, fittings, silencers, manifolds, temperature, and simultaneous demand as part of the complete flow path. The final selection remains subject to the actual component datasheet, applicable standards, and validation on the installed system.
FAQ