Cylinder Air Consumption (SCFM) Calculator
Double-acting pneumatic cylinders consume air on both the extend and retract strokes, doubling the swept volume compared to single-acting cylinders. The compression ratio...
Formula
Source: Engineering Toolbox, Parker Pneumatics | Last reviewed: June 8, 2026
Examples
0 SCFM
= 6.8 SCFM
- bore = 4
- stroke = 6
- cycles_per_min = 10
- pressure = 100
4" bore cylinder at 100 psig, 10 CPM = 6.8 SCFM
0 SCFM
= 2.4 SCFM
- bore = 2
- stroke = 4
- cycles_per_min = 30
- pressure = 80
2" cylinder at 80 psig, 30 CPM
0 SCFM
= 27.3 SCFM
- bore = 8
- stroke = 24
- cycles_per_min = 5
- pressure = 100
Large 8" bore cylinder
Where is this used?
Determining air receiver tank capacity to handle peak cylinder demands.
Calculating energy costs of pneumatic automation for ROI analysis.
Specifying air treatment equipment (dryers, filters) based on total consumption.
Frequently Asked Questions
Why factor in the compression ratio?
The cylinder volume at 100 psig contains about 7.8× more air mass than the same volume at atmospheric pressure. Compressors are rated in SCFM of free air (atmospheric intake), so you must multiply cylinder volume by the compression ratio to get the equivalent SCFM demand.
How does the rod affect the calculation?
This calculation ignores the rod volume on the retract stroke for simplicity. For large-rod cylinders, the retract volume is ~5-15% less than extend volume. For most sizing purposes, this approximation is adequate; for precision, subtract the rod cross-sectional area from the retract-side area.
What is a typical duty cycle for pneumatic cylinders?
In automated production, continuous 10-30 CPM is common. For sizing compressors, use the average consumption over the duty cycle, not the peak. Air receivers smooth peak demands. This calculator provides the instantaneous SCFM at the given cycle rate.
Reviewed for accuracy
· Last reviewed: June 8, 2026
All calculations are for reference only. Always verify with manufacturer data and a qualified engineer for critical applications. Learn about our editorial process.