[evolution]

With just a PSI rating, you can't figure out the CFM; PSI is a pressure measurement, whereas CFM is a volume/time measurement. That's why when you buy a compressor, you'll see two ratings, both the CFM and the PSI.

Do you have any additional information that you can give us, such as the HP? Also, is the container you are working with at atomospheric pressure? Knowing this information may help lead to an answer.