Free · Physics models

Actual to Standard Air Flow

Convert actual volumetric air flow to the fixed standard reference of 294.26 K and 14.7 psi absolute.

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scfm = 200.00000 cuftmin.

Qs = Qa (294.26 K / T) [(14.7 psi + pg)/14.7 psi].

Enter these known values and leave the other values blank.

Convert actual volumetric air flow to the fixed standard reference of 294.26 K and 14.7 psi absolute.
Pressure is gauge pressure relative to the 14.7 psi reference atmosphere, and temperature is absolute in the gas-law ratio.
This is an ideal dry-gas normalization; it does not account for humidity or compressibility. Standard cubic feet depend on the stated reference, which may differ from another supplier’s standard.
Inputs and inverse outputs share the displayed unit selectors. Clear a known field to solve for it, and lock quantities that must remain fixed. Singular inverses may have no finite result.

The density ratio uses absolute pressure, so gauge pressure must be offset by the reference atmosphere.

They agree when the actual pressure and temperature match the stated reference conditions.

Enforce the explicitly stated physical domain: Absolute pressure must be positive. Actual flow must be positive. Standard flow must be positive.