Howdy Everyone. This has always confused me, so I did some searching around the web and came up with these numbers. The "kind of accepted" standards are these: a 4" pot= a pint a 5/6" pot= a quart an 7/8" pot= a gallon (there are also 2 gallon sizes, though harder to find) a 10" pot = a 3 gallon a 14" pot= a 7 gallon a 20" pot= a 10 gallon a 24" pot = a 15 gal a 30" pot= a 20 gal a 35" pot = a 25/30 gal As has been stated on other posts, 1 foot of height per gallon Any comments, suggestions appreciated Lost_n_Arizona