Formula & worked example
FAD=Vreceiver·(P2abs−P1abs)/Patm/time.
A 500 L receiver rising 6 bar in 2 minutes corresponds to about 1.5 m³/min idealized free air.
Plant engineering calculator · Updated Sep 17, 2026
Air Compressor CFM Calculator — Receiver Pump-Up Free Air Delivery
Estimate compressor free-air delivery from receiver volume, pressure rise, atmospheric pressure and measured pump-up time.
Inputs
Live engineering result
Idealized FAD 1.4803849 m³/min
Idealized FAD 52.2793 CFM
Pressure rise 6 bar
Receiver test volume 0.5 m³
Assumptions & limits
- Assumes approximately constant receiver temperature; real compression heating biases a short pump-up test.
- Use absolute pressure ratios and account for system demand/leaks during the test.
Frequently asked questions
What does this Air Compressor CFM Calculator calculate?
Estimate compressor free-air delivery from receiver volume, pressure rise, atmospheric pressure and measured pump-up time.
Can I use the result for equipment selection?
Use the result as an engineering screening and cross-check. Confirm final selections against manufacturer performance data, design conditions, applicable standards and local code.
Why does MAXScanner show assumptions?
Plant calculations can move materially with pressure, temperature, fluid properties, diversity and operating conditions. Visible assumptions make the result auditable.