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Thread: Step Feeding Calculator?

  1. #1

    Default Step Feeding Calculator?

    Hi all,
    I’m just wondering if anyone has a Step Feeding calculator or knows how to crunch the numbers to determine how to adjust the OG to get an accurate ABV once fermentation stops. So, for instance, take the following scenario:

    I start with an OG of 1.2 and the yeast take it down to 1.05 and then I add more honey to bring the gravity up to 1.10.
    The yeast take it back down to 1.05 and I add more honey to bring the SG back to 1.10.
    I then let the yeast take the SG down to where I want it at, say, 1.01, and then stop fermentation.

    Now I know that my example may not me realistic, but I wanted to use round numbers to make the math easy.

    thanks

  2. #2
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    I could be wrong, but using your numbers I get 1.200-1.050=1.150. 1.150+(1.100-1.050)=1.200. 1.200+(1.100-1.010)=1.290.

    So, an adjusted OG of 1.290. Did you get another number?
    Find what you like, and hone it to perfection.

    And don't serve dodgy beer!

  3. #3

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    I would have though that your "total" OG is 1.20 plus two increases of 0.05 = 1.30?

    Then your total drop is 1.30 - 1.01 = 0.29

  4. #4
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    Quote Originally Posted by machalel View Post
    I would have though that your "total" OG is 1.20 plus two increases of 0.05 = 1.30?

    Then your total drop is 1.30 - 1.01 = 0.29
    Ah, sounds right. I was thinking about it too much and solved for points dropped...good catch.
    Find what you like, and hone it to perfection.

    And don't serve dodgy beer!

  5. #5

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    What yeast are you using because if I'm reading this right we're talking 40% abv and everything is going to poop out long before that. Shit my hydrometer only goes up to 1.17

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    misplaced a decimal point? new math? http://www.youtube.com/watch?v=Vetg7...eature=related
    Bees stole my signature file!

  7. #7

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    I would have though that your "total" OG is 1.20 plus two increases of 0.05 = 1.30? Then your total drop is 1.30 - 1.01 = 0.29
    Aha... Ok. I didn’t know that you could use “simple” math- I thought that there would be some sort of compounding effect (like bank interest), but I guess if you just calculate “points” in vs points out you get your number. Pretty cool.

    What yeast are you using because if I'm reading this right we're talking 40% abv and everything is going to poop out long before that. Shit my hydrometer only goes up to 1.17
    TAK-
    I know that the numbers are ridiculous, but I just used round numbers to make the math easy.

  8. #8
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    Quote Originally Posted by Robusto View Post
    <snip>...Now I know that my example may not me realistic, but I wanted to use round numbers to make the math easy.

    thanks
    Quote Originally Posted by TAKeyser View Post
    What yeast are you using because if I'm reading this right we're talking 40% abv and everything is going to poop out long before that. Shit my hydrometer only goes up to 1.17
    I believe this was just a hypothetical situation using round numbers so that he could get a feel for calculating the step feeding.

    Edit: Doh...beat me to it.
    Find what you like, and hone it to perfection.

    And don't serve dodgy beer!

  9. #9

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    Quote Originally Posted by Robusto View Post
    TAK-
    I know that the numbers are ridiculous, but I just used round numbers to make the math easy.
    OK, no one before me said anything and I was just like "am I reading these numbers wrong". 1.1 is a round number that could produce actual results

  10. Default

    By my calcs, you would have (for example) 5 gallons of must with 28.18 lb of honey in your original 1.200 must. You would then ferment down to 1.050 and add 9.27 lb of honey for a total volume of 5.79 gallons to get back to 1.100. You would then ferment down to 1.050 and add 10.73 lb of honey to get back to 1.100, for a total volume of 6.70 gallons. This is an equivalent OG of 1.255. Fermenting down to a FG of 1.010 gives you an ABV around 33%, depending which formula you use. Of course, getting a 1.200 must to take off would be a bit of a trick.

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