measure length x width x height. this will give cubic feet. find out how many cubic feet a gallon of water is and divide it into your measurments. this will give ya cubic feet of water
You take the length times the width times the depth and that will give you cubic feet. If your pool is round, you would multiply 3.14 (Pi) times the radius squared times the depth of the pool. Then...
A swimming pool that measures 12 feet by 30 feet and has an average depth of 6 feet contains approximately 16,157 gallons of water. 12 x 30 x 6 = 2160 cubic feet 1 cubic foot = approximately 7.48...