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Thread: How many gallons is my pool?

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    Shelley N's Avatar
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    How many gallons is my pool?

    I've never been able to figure it out how many gallons my pool actually holds, so this weekend I tested the CL at 2ppm with the FAS-DPD, added 2 quarts of 6% and it rose to 4.5ppm. I tried to get the bleach calc to work backwards for me, but it wont. How do I figure this out? It's a 15 x 30 AG and I've heard so many different amounts of what it holds that I just thought I'd measure the rise after adding. Thanks.
    Shelley
    Denver, CO

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    Download BleachCalc here... it has a calculation that does it for you. If your water (not wall) is 3.5' deep, you have 9276 gallons. If you water is 4 feet deep, you have 10,602. If you have a deep end, you will have to find the avg. depth for your calc.

    EDIT... just plugged in 10600, 1/2 gallon, and it said you should have gotten a 2.8ppm rise in TC, which is near your 2.5... I'd say you have around 11,000 gallons.

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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    RAA's Avatar
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    You can also try this link to figure out the volume of your pool. You will need to know the depth.

    Pool Volume Calculator

    Hope this helps.
    -Rick
    ~15k Gal IG
    Gunite/White plaster
    AquaLogic PS-8 w/SWG

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    Shelley N's Avatar
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    Forgot about the "other calcs" button.

    Today, it's 44", so that's 3.66', so that's 9700.83 gal.

    Golly, I thought it was more since the bleach calc says to add 2 quarts to raise 12,000 gallons 2.5ppm. That was the rise in ppm I got by adding 2 quarts anyway.
    Shelley
    Denver, CO

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    Shelley N's Avatar
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    If I use the Pentair pool calc program and enter a 15' circle and a 15' square (which a 15 x 30 oval is I think) i get 11,026 gal. That's quite a difference.
    Shelley
    Denver, CO

  6. Back To Top    #6
    This is just weird! I used the pentair and did the oblong, and just used 15 feet for both diameters, and 3.6 depth, and got 10,935.
    When I added up the 7.5 radius circle plus the 15' square, I got 10,846... different than the numbers you got.

    Personally, if it was my pool, I would treat it as 10,000, and then adjust a little accordingly, if necessary.

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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    Shelley N's Avatar
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    I used 3.66 for my depth and that's the difference.

    Thanks for everyone's input.
    Shelley
    Denver, CO

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    In the Industry

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    I've recently figured out that I have probably overestimated my pool gallonage. . . I don't know the manufacturer, but I have some documentation showing that the deep portion is 4'3" and the shallow part is 3'3". I assumed that meant the depth of the filled pool, but once I actually got into the pool, I realized it wasn't that deep! So those dimensions actually refer to the depth of the shell, not the water.

    I recalculated with revised depths (30" and 42") and obtained gallonage figures around 7500-8200. Shucks, now I have to use a calculator to figure out how much chemicals to add! 10,000 gallons was so easy to work with <sigh>

    Jules
    ~Jules~

    My pool: INDOOR 13x27 rectangular fiberglass, built ~2001, BBB, TA-60 sand filter, Hayward two speed pump (1 hp/0.33 hp), 3/4 hp booster pump for solar heater
    Taylor K-2006 test

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    RAA's Avatar
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    I think the only way to tell exactly how much water is in your pool is at fill time (unless you have a prefectly square or round pool) when you can look at your meter and record how many gallons it took to fill it up. I have an odd shaped pool and I can only guesstimate my pool volume. Some calculations put my pool at 18k and others put it at 15k. I just go with the 15k since that seems to be working very well. I didnt check the water meter when i filled it up
    -Rick
    ~15k Gal IG
    Gunite/White plaster
    AquaLogic PS-8 w/SWG

  10. Back To Top    #10

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    Using software that I use everyday for my job (manufacturing), I come up with 10,997.65344 gallons. This is based on a pool 30 feet in overall length, with 7.5 feet (15 feet diameter) radius ends, and a continuous water depth of 3.66 feet. The surface area is 401.714351 cubic feet. Multiply that by 3.66 and you get 1470.274525 cubic feet. One cubic foot is 7.48 gallons (per Machinery Handbook, 23rd Edition). So 1470.274525 x 7.48 = 10,997.65344 gallons. I also calculated it manually, and came up with 10,997.6599 gallons, so pretty darn close.
    Poor Man's Pool
    Doughboy 18 ft round above ground
    7600 gal with center drain
    Pentair sand filter, 1 HP pump
    50 ppm borates
    "I know just enough to be dangerous"
    Pool Calc Ver 1.41 (Excel)

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