HOW MANY GALLONS OF WATER DOES MY POOL HOLD ?In order to figure out proper doses of chemicals for your pool, or plan a re-fill after a Liner Replacement,you need to determine how many gallons of water it holds.  To do that, you need to knowFour different numbers: the length, width, average depth, and a multiplier that determines gallons.
 Round Pools / multiplier = 5.9
 Diameter x Diameter x Average Depth of water (Ft.) x 5.9 = Total Gallons (US)IE: 24' Round Pool / 48" deep side-wall /  42" (3.5 ft.) Water depth24 x 24 = 576 x 3.5' = 2016 x 5.9 = 11,894 gallons*Depth of Water in Feet (Ft.) = Subtract side-wall depth by 6"  (See Below ** for pools with shallow & deep ends)
 Oval Pools / multiplier = 5.9
 Length of pool x Width of pool x Average Depth of water (Ft.) x 5.9 = Total Gallons (US)IE: 17' x 35' Oval Pool / 54" deep side-wall / 48" (4 ft.) Water depth17 x 35 = 595 x 4' = 2380 x 5.9 = 14, 042 gallons*Depth of Water in Feet (Ft.) = Subtract side-wall depth by 6" for  (for one-depth pools & Above Grounds)   Or...**Determine Average Depth:  Measure the Shallow end and the Deep end depth.   Add them together and divide by 2.Example:  Shallow end (2') + deep end (6') = 8'    /    8' divided by 2 = Average Depth of 4'
 Rectangular Pools / Square or Free Form / multiplier = 7.5
 Length of pool x width of pool x Average depth of water* (Ft.) x 7.5 = Total gallons (US)IE: 16' x 32' Rectangular Pool / 42" deep side-wall / 60" (5 ft.) Average Water depth16 x 32 = 512 x 5' = 2560 x 7.5 = 19,200 gallons**Determine Average Depth = Measure the Shallow end and the Deep end depth. Add them together and divide by two (2).Example:  shallow end (2 1/2') + deep end (7 1/2') = 10'   /   10' divided by 2 = Average Depth of 5'