Frequently pneumatic cylinder of international, ISO, origin have the bore and stroke listed in Millimeters, mm, instead of inches as had been the North American standard.
The majority of compressed air information in North America that relates to flow rates and usage is given in SCF (Standard Cubic Feet) or SCFM (Standard Cubic Feet per Minute). The compressed air pressure is most frequently listed in PSIG (Pounds per Square Inch, Gage)
This presents a challenge when designing, sizing or evaluating the amount of compressed air required or used. It is laborious to convert each metric dimension to the English inch, psig and scfm system.
From Norgren Helpful Engineering Information, NC-77, formula we crunched the constants.
You may enter the bore and stroke of a cylinder in inches (Formula 1) or in millimeters (Formula 2) and get results in SCFM.
Another pair of formulas will aid calculating the volume and how much compressed air a cylinder may hold.