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Here is the pool volume formula:

Length x Width x Average Depth x Multiplier = Volume in US Gallons

Determine the Multiplier:

  • Multiplier = 7.5 for Rectangle, Square, or Free-Form pools
  • Multiplier = 5.9 for Round or Oval pools

Determine the Average Depth:

To determine the average depth in a pool where the bottom slopes, measure the shallow end, the deep end depth. Add them together and divide by two (2).

Example:

Shallow End = 2ft. Deep End = 10ft
2ft + 10ft = 12ft; 12/2 = 6ft average depth

Standard In-Ground Pool Volumes in Gallons by Size
Pool Size
(in feet)
3.5 ft
Avg Depth
4 ft
Avg Depth
4.5 ft
Avg Depth
5 ft
Avg Depth
12×24 7,600 8,600 9,700 10,800
14×28 10,300 11,800 13,200 14,700
15×30 11,800 13,500 15,200 16,900
16×32 13,400 15,400 17,300 19,200
18×36 17,000 19,400 21,900 24,300
19×38 19,000 21,700 24,400 27,100
20×40 21,000 24,000 27,000 30,000
22×44 25,400 29,000 32,700 36,300
25×45 29,531 33,750 37,968 42,187
25×50 32,800 37,500 42,200 46,900
30×50 39,375 45,000 50,525 56,250

 

Above Ground Swimming Pool Water Volumes by Size
Size 48in Wall 52in Wall
12ft Round 2,975 gals 3,398 gals
15ft Round 4,646 gals 5,310 gals
18ft Round 7,646 gals 8,602 gals
21ft Round 9,106 gals 10,408 gals
24ft Round 11,895 gals 13,594 gals
27ft Round 15,054 gals 17,205 gals
30ft Round 18,585 gals 21,240 gals
33ft Round 22,488 gals 25,700 gals
12x24ft Oval 5,948 gals 6,797 gals
15x30ft Oval 9,293 gals 10,620 gals
16x32ft Oval 10,573 gals 12,084 gals
18x33ft Oval 12,267 gals 14,019 gals