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Difference between pre boil and post boil gravity

Discussion in 'Homebrewing' started by nervousbrewer, Oct 22, 2012.

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  1. nervousbrewer

    nervousbrewer Initiate (0) Dec 29, 2008 Ohio

    My gravity post mash and pre boil was 1.050. Post boil it was 1.060.

    It was my first all grain batch. I lost about a gallon of wort when boiling (collected 6.5g, ended up with 5.5g)

    Is that much of a change in gravity from pre boil to post boil typical?
     
    #1 nervousbrewer, Oct 22, 2012
  2. kjyost

    kjyost Initiate (0) May 4, 2008 Canada (MB)

    Pre boil volume x Preboil gravity points = Post boil volume x post boil gravity points

    Always. Math doesn't lie.
     
    #2 kjyost, Oct 22, 2012
  3. yinzer

    yinzer Initiate (0) Nov 24, 2006 Pennsylvania

    I'm not sure what you're asking. Is it for someone to check your readings?

    There isn't an efficiency so to speak on how much your gravity will change. If you have any of the three numbers you can calculate the fourth.
     
    #3 yinzer, Oct 22, 2012
  4. coreyfmcdonald

    coreyfmcdonald Initiate (0) Nov 13, 2008 Georgia

    I think he was asking if the amount of wort loss (and therefore gravity gain) was typical of what I am assuming is a 60 minute boil, which it was.
     
    #4 coreyfmcdonald, Oct 22, 2012
  5. mikehartigan

    mikehartigan Maven (1,409) Apr 9, 2007 Illinois

    You lost about 16% of your volume - all water - which increases your gravity by around 18%. So yes, 1.060 is about right.
     
    #5 mikehartigan, Oct 22, 2012
  6. Hogie

    Hogie Initiate (0) Mar 19, 2008 Michigan

    Pre-boil: 6.5 gallons x 50 (take last two digits from gravity 1.050)= 325 gravity points.
    Post boil: 325/5.5 gallons = 59.09 ie 1.059 OG
    So yeah, that's correct.
     
    #6 Hogie, Oct 22, 2012
  7. HerbMeowing

    HerbMeowing Maven (1,283) Nov 10, 2010 Virginia
    Trader

    Success!

    Keep on Brewin'
     
    #7 HerbMeowing, Oct 23, 2012
  8. GreenKrusty101

    GreenKrusty101 Initiate (0) Dec 4, 2008 Nevada

    Yes, unless you boiled for longer than normal (60 min)
     
    #8 GreenKrusty101, Oct 23, 2012
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