Since there are 4 jacks and 4 queens in a deck, there are a total of 8 jacks and queens in 52 cards. this translates to 8/52, ( simplified 2/13 ) or 15%.
18.5 * 7 = 129.5 129.5 * 8 = 1036 (Full planter aka not what we want) If we take the height and divide it be 2 then we would get 4in (halfway full) So 129.5 * 4 = 518 Cu.