How Much Water is in Your Pool?

Probably the most important thing you’ll ever have to know about your pool is the amount of water in it. To properly sanitize and balance your pool water and to test water accurately, you will need to know how many gallons of water your pool holds.

Water Capacity for Common Pool Sizes

(Total Gallons)*

ABOVE GROUND POOLS

AVERGAGE POOL DEPTHS

36"

42"

48"

52"

12’ Round

2,500

 

3,400

 

15’ Round

4,000

4,600

5,000

5,700

18’ Round

 

 

7,600

8,200

20’ Round

 

 

10,000

10,218

21’ Round

 

 

13,500

14,500

24’ Round

 

 

17,000

19,500

28’ Round

 

 

18,000

20,000

30’ Round

 

 

21,000

23,000

11’ x 18’ Oval

 

 

5,000

 

12’ x 24’ Oval

 

 

7,600

9,300

15’ x 25’ Oval

 

 

10,000

11,000

15’ x 27’ Oval

 

 

10,700

 

15’ x 30’ Oval

 

 

12,000

14,800

16’ x 32’ Oval

 

 

13,600

 

18’ x 33’ Oval

 

 

17,400

18,900

21’ x 38’ Oval

 

 

19,000

22,100

21’ x 41’ Oval

 

 

23,000

25,000

IN-GROUND POOLS

AVERGAGE POOL DEPTHS

5'

6'

7'

8'

10’ x 20’ Rectangle

7,500

9,000

10,500

12,000

12’ x 20’ Rectangle

9,000

10,800

12,600

14,400

12’ x 24’ Rectangle

10,800

13,000

15,000

17,300

14’ x 28’ Rectangle

14,000

17,600

20,500

23,500

15’ x 30’ Rectangle

16,900

20,300

23,600

27,000

16’ x 24’ Rectangle

14,400

17,300

20,100

23,000

16’ x 32’ Rectangle

19,200

23,000

26,800

30,600

16’ x 36’ Rectangle

21,600

25,900

30,200

34,500

18’ x 36’ Rectangle

34,300

29,200

34,000

38,800

18’ x 40’ Rectangle

19,200

32,400

37,700

43,100

20’ x 40’ Rectangle

21,600

36,000

41,900

47,900

25’ x 45’ Rectangle

34,300

50,500

58,900

67,300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Any Other Pool Size

Calculate the gallon capacity of your pool using the following formulas. All measurements should be in feet.

Round or Oval Pools

Square or Rectangle Pools

Average Depth
Length or Diameter
Width or Diameter
5.9
= Gallon Capacity
Average Depth
Length
Width
7.5
= Gallon Capacity