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Home > Calculating Pool Size
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Calculating Pool Size/Gallons
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Following are the formulas used to figure how many gallons of water your pool holds. This number is important when sizing your pool filter and figuring amounts of chemicals needed to properly balance your water chemistry. These will give you estimates and not exact gallons but it will be close enough for estimating amounts of chemicals to put in the pool to balance your water.
Circular, Kidney or Oval Pool:
Multiply the length of the pool by the width of the pool by the average depth by 5.9 = Gallons of water in pool
Example:
Deep end of the pool is 6 ft, shallow end of the pool is 3 ft : 6 + 3 ÷ 2 = 4.5 Average Depth
Length - 30 ft
Width - 20 ft
Avg. Depth – 4.5 ft
30 x 20 x 4.5 x 5.9 = 15,930 gallons
Add approx. 500 – 600 gallons if you have a spa attached to your pool.
Square or Rectangular Pool:
Multiply the length of the pool by the width of the pool by the average depth by 7.5 = Gallons of water in pool
Example:
Deep end of the pool is 8 ft, shallow end of the pool is 3 feet: 8 + 3 ÷ 2 = 5.5 Average Depth
Length – 28 ft
Width – 14 ft
Avg. Depth – 5.5
28 x 14 x 5.5 x 7.5 = 16,170 gallons
Add approx. 500 – 600 gallons if you have a spa attached to the pool.
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