Multiplier = 7.5 for Rectangle, Square, or Free-Form poolsMultiplier = 5.9 for ring or Oval pools

Determine the average Depth:

To identify the mean depth in a pool where the bottom slopes, measure the shallow end, the deep end depth. Include them together and divide by 2 (2).

Example:

Shallow end = 2 ft. Deep finish = 10 ft2 ft + 10 ft = 12 ft; 12/2 = 6 ft typical depth

Standard In-Ground Pool quantities in Gallons through Size
Pool Size (in feet)3.5 ft Avg Depth4 ft Avg Depth4.5 ft Avg Depth5 ft Avg Depth
12×247,6008,6009,70010,800
14×2810,30011,80013,20014,700
15×3011,80013,50015,20016,900
16×3213,40015,40017,30019,200
18×3617,00019,40021,90024,300
19×3819,00021,70024,40027,100
20×4021,00024,00027,00030,000
22×4425,40029,00032,70036,300
25×4529,53133,75037,96842,187
25×5032,80037,50042,20046,900
30×5039,37545,00050,52556,250

Above floor Swimming pool Water volumes by Size
Size48 in Wall52 in Wall
12 ft Round2,975 gals3,398 gals
15 ft Round4,646 gals5,310 gals
18 ft Round7,646 gals8,602 gals
21 ft Round9,106 gals10,408 gals
24 ft Round11,895 gals13,594 gals
27 ft Round15,054 gals17,205 gals
30 ft Round18,585 gals21,240 gals
33 ft Round22,488 gals25,700 gals
12×24 ft Oval5,948 gals6,797 gals
15×30 ft Oval9,293 gals10,620 gals
16×32 ft Oval10,573 gals12,084 gals
18×33 ft Oval12,267 gals14,019 gals