Estimate air flow through a round orifice/restrictor.
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Use the Compressed Air Orifice Flow Calculator to estimate air flow through a round orifice/restrictor. The calculator uses Orifice/nozzle diameter, Upstream absolute pressure, Downstream absolute pressure, Air temperature and Discharge coefficient Cd and reports mass/reference flow; choked status.
Read the result in the context of the selected units and pressure basis. For this tool, the primary outputs are mass/reference flow; choked status. Change one input at a time when comparing scenarios so the effect of each variable remains clear.
PneumaForge applies this verified method: Compressible orifice equation, choked/subcritical. The functional engine is shared with related tools in the compressible-orifice family, while this page solves the specific intent represented by compressed air orifice flow calculator.
Compressible orifice equation, choked/subcriticalReproducible example: start with the calculator's default values (Orifice/nozzle diameter = 2; Upstream absolute pressure = 7.01325; Downstream absolute pressure = 1.01325; Air temperature = 20) and calculate the result. Then change the variable most relevant to your application and compare the new mass/reference flow; choked status against the baseline.
Ideal-gas, quasi-steady, known discharge coefficient C_d. P₁,P₂ absolute. Flag non-air gases unless γ,R supplied.
It is designed to estimate air flow through a round orifice/restrictor. The reported outputs are mass/reference flow; choked status.
The calculator uses Orifice/nozzle diameter, Upstream absolute pressure, Downstream absolute pressure, Air temperature and Discharge coefficient Cd. Only use values that represent the same operating condition or design case.
The calculation follows: Compressible orifice equation, choked/subcritical. The page also states the assumptions that define where the method is valid.
Ideal-gas, quasi-steady, known discharge coefficient C_d. P₁,P₂ absolute. Flag non-air gases unless γ,R supplied.
Yes. PneumaForge converts supported units through canonical engineering units. For compressed-air reference flows and pressure bases, the reference pressure and temperature must also remain consistent.