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4 Steps (In-Depth)
- 1 Balancers
- 2 Sanitizers
- 3 Shock
- 4 Algae Control
Chlorine Usage
Pool Water Capacity
Water Balance Testing
Troubleshooting
Pool Opening
Pool Closing - Above Ground
Pool Closing - In-Ground
Pool Chemical Safety
Pool Water Safety
Glossary
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

3'

3.5'

4'

4.5'

12’ Round

2,500

 

3,400

 

15’ Round

4,000

4,600

5,000

5,900

18’ Round

 

 

7,600

8,600

20’ Round

 

 

9,400

10,600

21’ Round

 

 

10,400

11,700

24’ Round

 

 

13,600

15,300

28’ Round

 

 

18,500

20,800

30’ Round

 

 

21,200

23,800

11’ x 18’ Oval

 

 

4,760

 

12’ x 24’ Oval

 

 

6,800

7,650

15’ x 25’ Oval

 

 

8,850

9,960

15’ x 27’ Oval

 

 

9,560

 

15’ x 30’ Oval

 

 

10,600

11,950

16’ x 32’ Oval

 

 

12,000

 

18’ x 33’ Oval

 

 

14,000

15,800

21’ x 38’ Oval

 

 

18,800

21,200

21’ x 41’ Oval

 

 

20,320

22,860

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

12,960

15,120

17,300

14’ x 28’ Rectangle

14,700

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

30,700

16’ x 36’ Rectangle

21,600

25,900

30,200

34,500

18’ x 36’ Rectangle

24,300

29,200

34,000

38,800

18’ x 40’ Rectangle

27,200

32,400

37,800

43,200

20’ x 40’ Rectangle

30,000

36,000

42,000

48,000

25’ x 45’ Rectangle

42,200

59,600

59,000

67,500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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
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