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how many gallons
How many gallons does my pool hold?


Before you can start any kind of chemical treatment of your pool water, you will need to know how many gallons are in your pool. There is a simple way to calculate your pool volume that only requires 4 basic numbers:
  • The length of your pool
  • the width of your pool
  • The average depth
  • the multiplier factor
The formula is LENGTH x WIDTH x AVERAGE DEPTH x MULTIPLIER = The number of gallons in your pool!

length and width are easy measurements that you get with a tape measure. For round pools the "length and width" will be the same and is just calculated as the longest measurement you can get going from one side to the other.

Multiplier is just a factor that depends on the shape of your pool. A rectangle, square or free form pool has a multiplier of 7.5 . A round or oval pool has a multiplier of 5.9

Average depth is just what is says.The average depth of your pool. Take the deepest point plus the shallowest point. Add them together and devide by two. ( For example : shallow end 3' deepest end 9' = 12' feet combined devided by 2 = 6' average depth ) For above ground pools take 4" off of the height of the sidewall ( so a 52" pool has 48" of water. A 48" pool has 44", etc ).

Example: a 10' x 20' rectangle pool with an average depth of 6' would calculate the water volume as follows: 10 x 20 x 6 x 7.5 = 9,000 gallons !

The charts bellow show the water content of standard round and oval above ground pools, as well as some common size in ground pools. Once you have determined your pool volume, Click pool chemicals to see the eFamilyFun solutions for a perfect sparkeling pool!


Above ground pool 48" wall
12 ft Round  ~2,975 gallons 12' x 24' Oval ~ 5,948 gallons
15 ft Round  ~4,646 gallons 15' x 30' Oval ~ 9,293 gallons
18 ft Round ~ 7,646 gallons 16' x 32' Oval ~ 10,573 gallons
21 ft Round ~ 9,106 gallons 18' x 33' Oval ~ 12,267 gallons
24 ft Round ~ 11,895 gallons

27 ft Round ~ 15,054 gallons

30 ft Round ~ 18,585 gallons

33 ft Round ~ 22,488 gallons


Above ground pool 52" wall
12 ft Round ~ 3,398 gallons 12' x 24' Oval ~ 6,797 gallons
15 ft Round ~ 5,310 gallons 15' x 30' Oval ~ 10,620 gallons
18 ft Round ~ 8,602 gallons 16' x 32' Oval ~ 12,084 gallons
21 ft Round ~ 10,408 gallons 18' x 33' Oval ~ 14,019 gallons
24 ft Round ~ 13,594 gallons 18' x 40' Oval ~ 19,116 gallons
27 ft Round ~ 17,205 gallons

30 ft Round ~ 21,240 gallons

33 ft Round ~ 25,700 gallons


In ground Pools

POOL SIZE

GALLON 3.5' Av. DEPTH

GALLON 4' Av. DEPTH

GALLON 4.5' Av. DEPTH GALLON 5' Av. DEPTH GALLON 5.5' Av. DEPTH

12' x 24'

7,600

8,600

9,700

10,800

11,900

14' x 28'

10,300

11,800

13,200

14,700

16,200

15' x 30'

11,800

13,500

15,200

16,900

18,600

16' x 32'

13,400

15,400

17,300

19,200

21,100

18' x 36'

17,000

19,400

21,900

24,300

26,700

19' x 38'

19,000

21,700

24,400

27,100

29,800

20' x 40'

21,000

24,000

27,000

30,000

33,000

22' x 44'

25,400

29,000

32,700

36,300

39,900

25' x 45'

29,531

33,750

37,968

42,187

46,406

25' x 50'

32,800

37,500

42,200

46,900

51,600

30' x 50'

39,375

45,000

50,525

56,250

61,875