SCFM to ACFM Calculator
Standard to actual cubic feet per minute.
Enter your values
ⓘ Live results
Results
- Actual airflow
- 569.7 ACFM
- Volume expansion
- 13.9%
- In m³/h
- 967.9
- Standard airflow
- 500 SCFM
Quick answer
ACFM is SCFM corrected for actual pressure and temperature, so hot or high-altitude air occupies more volume.
ACFM = SCFM x (Pstd/Pact) x (Tact/Tstd)
How to use the SCFM to ACFM Calculator
- 1Enter the SCFM rating from the equipment data sheet.
- 2Enter the real operating temperature and barometric pressure.
- 3Size ducts on ACFM and heat capacity on SCFM.
Worked example
Using the values the calculator loads with:
Inputs
- Standard airflow500 SCFM
- Actual temperature40 °C
- Actual pressure95 kPa
Results
- Actual airflow569.7 ACFM
- Volume expansion13.9%
- In m³/h967.9
- Standard airflow500 SCFM
Frequently asked questions
Which does a fan actually move?
A fan moves a fixed volume, so it delivers ACFM; the mass flow drops as air thins.
Standard conditions?
This tool uses 20°C and 101.325 kPa.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.