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Thread: Can anyone help me determine gallons in this irregular pool?

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    Join Date
    Apr 2016
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    Can anyone help me determine gallons in this irregular pool?

    I'm ready to start adjusting my water but I have no idea how many gallons are in this pool. My inspector when I bought the house estimated 30,000 I think. My estimates after trying a variety of methods ranged from 25,000 to 32,000. Pool store guy said 37,000. Any math wizzes out there?

    pool size.jpgpool_23k.jpgpool_29k.jpg

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    cowboycasey's Avatar
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    Re: Can anyone help me determine gallons in this irregular pool?

    while a pain, use the bottom of pool math cut each of your sections and input into it..

    the deep end looks to be 12 x 14 at 9 feet deep = 11,300 gallons http://www.troublefreepool.com/calc.html

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    Re: Can anyone help me determine gallons in this irregular pool?

    I had tried that but my numbers come out drastically different depending on method used. I did it again with the picture I just made for this post:

    Using this method I get 23k:


    Using this method I get 29k:


    ... but the kicker is if I change something small like the starting depth from 3.5 feet to 4 feet, I get another 1,000 gallons in the pool (30,000 instead of 29,000).

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    Richard320's Avatar
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    Re: Can anyone help me determine gallons in this irregular pool?

    I split it up into 4 sections.

    Half a circle with 16' diameter 9' deep
    12*16 with a slope from 4.5 to 9
    A strange wedge shape 18 * (18>6) * (3>4.5)
    6.5 * 7 * (0>3)

    I get 23,000 gallons.

    Dose the pool at 23000 and check your changes against Effects of Adding Chemicals in poolmath. If you come up short or over, adjust the pool volume.

    Or burn up a lot of reagent using A Chemical Way of Calculating Pool Volume
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