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  1. #1
    Novice
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    Dec 2007
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    Toms River NJ
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    6

    Changing Proof Formula

    Several years ago some one posted a formula where you can input ounces of whiskey and its proof and then add ounces of water and come up with a final strength. Can't find it and am asking if anyone has the formula?

    Thanks.

    Found it when I posted.
    Last edited by goodyrb; 07-30-2014 at 06:24.

  2. #2
    Enthusiast
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    Jan 2014
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    DFW, TX
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    453

    Re: Changing Proof Formula

    You know this is very simple math, right? I'm not trying to be a prick, but give a man a fish blah blah.

    If you have 3oz of a 120 proof liquor and 1oz of water, then your ending proof is (120*(3/4)) + (0*(1/4))=90 proof.

  3. #3
    Enthusiast
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    Jun 2013
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    Clearwater
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    277

    Re: Changing Proof Formula


  4. #4
    Advanced Taster
    Join Date
    Jun 2013
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    Atlanta, GA
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    246

    Re: Changing Proof Formula

    Also, if you happen to find yourself wanting to reduce to a certain proof and are not near a computer, I have a simple formula that works. uncut proof divided by desired proof minus 1 = the number of ounces of water to add per ounce of bourbon. Example: 126 proof bourbon that you want to cut to 94 proof: 126 divided by 94 = 1.34. Subtract 1 and you add .34 ounces of water for each ounce of bourbon in you glass. A conversion app on your phone can change that to milliliters and a children's medicine syringe can help with precision. I know that is getting really involved and I don't really ever do it but just in case you wanted an easy way to figure...

  5. #5
    Advanced Taster
    Join Date
    Apr 2014
    Location
    Pennsylvania
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    Re: Changing Proof Formula

    Quote Originally Posted by gooneygoogoo View Post
    Also, if you happen to find yourself wanting to reduce to a certain proof and are not near a computer, I have a simple formula that works. uncut proof divided by desired proof minus 1 = the number of ounces of water to add per ounce of bourbon. Example: 126 proof bourbon that you want to cut to 94 proof: 126 divided by 94 = 1.34. Subtract 1 and you add .34 ounces of water for each ounce of bourbon in you glass. A conversion app on your phone can change that to milliliters and a children's medicine syringe can help with precision. I know that is getting really involved and I don't really ever do it but just in case you wanted an easy way to figure...
    I like that you figured a method that works for you. I just use the cross multiplication from above, entered into an Excel spreadsheet if I want to get exact. USually I just add 1.5-1.8ml of water to a standard shot glass size pour. Nothing is overdoing it to me. I get really involved when it comes to bourbon so don't let anyone tell you to not take things seriously. And I do have a childs medicine syringe, 4 in fact - 2 in my bar area and 2 in my kitchen. I've recently seen the "don't get too serious its just bourbon" comment several times, but I like to get to the proof I want exactly. Otherwise how will I zero in on what water ratio I prefer with each different bottle? Be as hardcare as you want with how you drink (just don't drink pink cocktails...)
    Last edited by jmj_203; 07-30-2014 at 12:40.

  6. #6

    Re: Changing Proof Formula

    Quote Originally Posted by jmj_203 View Post
    Shooey, I get really involved when it comes to bourbon.
    I have a very simple formula. If I want to reduce the proof a little I add one ice cube. If I want to reduce the proof a lot I add two ice cubes. Works every time.

    Some things in life I'm willing to work at getting 4 significant digits of accuracy. This isn't one of them!

  7. #7
    Advanced Taster
    Join Date
    Jun 2013
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    Atlanta, GA
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    246

    Re: Changing Proof Formula

    Quote Originally Posted by jmj_203 View Post
    I like that you figured a method that works for you. I just use the cross multiplication from above, entered into an Excel spreadsheet if I want to get exact. USually I just add 1.5-1.8ml of water to a standard shot glass size pour. Nothing is overdoing it to me. I get really involved when it comes to bourbon so don't let anyone tell you to not take things seriously. And I do have a childs medicine syringe, 4 in fact - 2 in my bar area and 2 in my kitchen. I've recently seen the "don't get too serious its just bourbon" comment several times, but I like to get to the proof I want exactly. Otherwise how will I zero in on what water ratio I prefer with each different bottle? Be as hardcare as you want with how you drink (just don't drink pink cocktails...)
    Haha.....yeah I hear you. No pink drinks for me. My view is do whatever it is that makes you happy. If you like to get really involved, great...if you don't that's fine too. Personally I like that it's really easy to just open a bottle and pour it into a glass and that's what I do 99.9% of the time. I think especially when trying to introduce someone new to bourbon it's important to let them figure out how they like to drink it. I have offered friends a pour and asked them if they want ice or want it neat. I've had them ask me if it's ok to drink it on ice or if that is "frowned upon". I never use ice but I always say they should do whatever they want...except dump a bunch of Coke in it! There are rare occasions when I want to experiment and do a side by side with Stagg Sr and Stagg Jr at the same proof or something like that so I figured my formula out a while back.

  8. #8
    Virtuoso
    Join Date
    Apr 2011
    Location
    Sutton, Massachusetts
    Posts
    1,201

    Re: Changing Proof Formula

    Quote Originally Posted by AEM View Post
    I have a very simple formula. If I want to reduce the proof a little I add one ice cube. If I want to reduce the proof a lot I add two ice cubes. Works every time.

    Some things in life I'm willing to work at getting 4 significant digits of accuracy. This isn't one of them!
    I do something similar - awhile ago I measured the amount of filtered water that comes out of my refrigerator's water dispenser when I just flick the actuator with my finger (quickly goes on and off).

    Exactly 5ml - so for a 1.5oz to 2.0oz pour this is roughly a 9%-12% drop per flick of the finger. 101pf + 1 flick = 90pf, +2 flicks = 80 pf - give or take a few proof points here or there.

    Close enough for jazz ...
    Mark

  9. #9
    Apprentice
    Join Date
    Jun 2014
    Location
    Annapolis, MD
    Posts
    47

    Re: Changing Proof Formula

    Warning: Math

    PI = Initial proof (in the bottle)
    PF = Final proof (in your glass)
    B = how much bourbon
    W = how much water

    B and W must be the same units (ml, shots, gallons)

    If you have 3oz of a 120 proof liquor and 1oz of water, then your ending proof is (120*(3/4)) + (0*(1/4))=90 proof.
    So in this case:
    PI = 120
    PF = 90
    B = 3
    W = 1
    and what we really have (since the 0*(1/4) goes away) is

    PI * (B / (B + W)) = PF

    go algebra!

    B / (B + W) = PF / PI

    (B + W) / B = PI / PF

    B + W = PI * B / PF

    W = (PI * B / PF) - B

    W = B * ((PI / PF) - 1)

    to double check...

    1 = 3 * ((120 / 90) - 1)

    Thanks for hanging in there. Go get yourself a nice pour - and forget the water ;-)
    Last edited by jwilson82; 07-30-2014 at 18:46.

  10. #10
    Guru
    Join Date
    Jun 2008
    Location
    Metro Detroit
    Posts
    5,144

    Re: Changing Proof Formula

    Nothing that has that many parentheses is simple math.
    bibamus, moriendum est
    Sipology Blog

 

 

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