How many gallons of water in a pool 1 inch deep and 480 sq ft?

First calc Total Gal in the top 1 ft. 480 sf x 1 ft deep = 480 ft3 div by 12 (12" in the top 1 ft). 40 ft3 in that top 1 in. 40 ft3 x 7.48 gal/ft3 = 299.2 gal in that 1"