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Thread: Easiest formula for calculating chlorine cost at the store

  1. Back To Top    #1

    Join Date
    Apr 2013
    North OKC Area

    Easiest formula for calculating chlorine cost at the store

    This is a lot easier to use in a store than any other formula I've seen used. I will still keep the calculator in my signature up for those that prefer to use it as opposed to memorizing a formula, such as my wife

    Formula: [Price] / [#Units] / [Oz per unit] / [% Chlorine]

    So if I can get 3 - 121oz jugs of 8.25% for $7.50 it would be:
    7.50 / 3 / 121 / 0.0825 = $0.2504

    Which is the same as: (7.5 / 3) / (121 * 0.0825) = $0.2504 (the formula most used on this site)

    Both formulas produced the same result up to twelve decimal places after doing over 100,000 calculations on random prices/units/unit sizes, and concentrations in Excel.

    As with many formulas, you must remember the order in which to enter the numbers. You should start with the price and end with the %chlorine (in decimal form like the example). It does not matter if [#Units] comes second or third and you do not need to enter [#Units] if it is only for one jug.
    17,100 Gal 27' x 52" AGP steel wall vinyl; 44gpm Cooper sand filter; Hayward 1hp sp1580 single-speed; 1.5" plumbing, 1 skimmer/jet, inline chlorinator.
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  2. Back To Top    #2
    BoDarville's Avatar
    Join Date
    Jun 2012
    DFW, Texas

    Re: Easiest formula for calculating chlorine cost at the sto

    That is easier to remember. Thanks for posting!
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  3. Back To Top    #3
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Elverson Pa.

    Re: Easiest formula for calculating chlorine cost at the sto

    I use this. Have it book marked in my phone.

    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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