SCFM Calculator

Your details

Choose which flow rate you know and which you want to find.
The volumetric flow rate measured at actual operating conditions.
ft³/min
The actual temperature of the gas at the point of measurement.
degF
The operating pressure of the gas. Gauge pressure adds atmospheric (14.696 psia) automatically.
psi
Moisture content of the gas. The SCFM standard assumes dry air (0%). Enter a value to see its effect on density.
%
SCFMHigh pressure
650.96ft³/min

Flow rate at standard conditions (70 degF, 14.696 psia, dry air)

ACFM100ft³/min
Compression ratio7.124
Density ratio6.5096
Mass flow rate48.822lb/min
Actual temp (Rankine)579.67degR
Actual pressure (psia)104.696psia
SCFM (standard)650.96
ACFM (actual)100

100.0 ACFM converts to 651.0 SCFM.

  • The actual air is denser than standard air (density ratio 6.510), so SCFM is higher than ACFM.
  • Mass flow rate at standard conditions is 48.822 lb/min of dry air.
  • SCFM assumes dry air. If humidity is significant, the actual mass flow will be slightly lower.

Next stepUse SCFM when comparing compressor ratings or specifying equipment. Use ACFM to size ducts, filters, and valves at actual operating conditions.

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