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Uh ok. Now it is as clear as mu..er cement. No actually I do understand it better, I think. To be sure appx 6 - 92lb bags will yield appx 1 yard. Right, wrong, indifferent?Scott Gleaton
So, to answer your question, 1 cubic foot of 3,000 psi concrete would require 285/20 = 14.25 lbs of Portland (0.15 bags). Or, to put it another way, 1 bag of Portland will yield "about" 6-2/3 cubic feet of 3,000 psi concrete.
Thanks Mike, but that website gives me the info I already have; ie volume of concrete needed. The number of 40 or 80 lb bags is for premix concrete (already contains sand and gravel). I mix mine from raw ingredients because it is substantially cheaper that way.