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Thread: Pool volume

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    cliffstone's Avatar
    Join Date
    Sep 2009
    Killen, AL

    Pool volume

    I'm not sure if I'm using the correct # for my volume. 18 deep x 36 wide x 5.5 avg depth ( 3 in shallow and slopes to 8 in deep end) x 7.5(converting from cu ft to gal) = 26730. Then multiply by .85 for sloped walls in deep end = 22,720. Is this correct? I realize this isn't exact but am I in line using 23,000 for my calculations? Thanks and have a great Memorial Day.
    18x36 IG, 22k Gal, Vinyl, 1HP Hayward SuperPump, 250lb Hayward Sand Filter

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Pool volume

    That sounds right. Over time you can refine your estimate by watching how chemical additions made based on that pool size behave. If your levels consistently go higher than you intended, the pool is smaller than estimated. If your levels consistently go lower than you intended, the pool is larger than estimated.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Pool volume

    Your average water depth might not be quite 5.5 feet. Look at a profile of your pool again (or just eyeball it).

    There is usually very little of the surface area that is actually 8.5 feet you might find your average to be a little less.

    As Jason said, calculating your chemistry dosages is a good way to get very close.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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