Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Are initial S.G. #'s usually lower than post boil #'s
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Old 08-24-2009, 01:20 PM   #1
bmckee56
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Default Are initial S.G. #'s usually lower than post boil #'s

This is probably a noob question. Is it typical to see lower numbers going into the boil pot than coming out of the pot? I suspect that with boil off of water the numbers do increase. Typically how much of an increase can one expect.

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Old 08-24-2009, 01:29 PM   #2
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You're right. Boil off increases the SG.

I don't have a ton of experience yet, but I generally see about 10+ points increase. For example, I brewed an ESB Friday, pre-boil SG was 1.044, after boil OG was 1.055. That seems to be the norm.


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Old 08-24-2009, 02:12 PM   #3
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If you get a program like Beersmith, it will tell you the estimated Pre and Post Boil SG.
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Old 08-24-2009, 02:24 PM   #4
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Quote:
Originally Posted by Edcculus View Post
If you get a program like Beersmith, it will tell you the estimated Pre and Post Boil SG.
I have BeerSmith, but obviously, I overlooked this function. I printed out the recipe, but in my hast, I did not see it on the sheet. I will be more observant in the future. Thanks for the feedback.

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Old 08-24-2009, 05:22 PM   #5
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It's not hard...if you have 6.5 gal @ 40 pts, then if you boil it to 5.5 gal you will have 6.5/5.5 * 40 pts = 47 pts.
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Old 08-24-2009, 06:54 PM   #6
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Quote:
Originally Posted by bmckee56 View Post
I have BeerSmith, but obviously, I overlooked this function. I printed out the recipe, but in my hast, I did not see it on the sheet. I will be more observant in the future. Thanks for the feedback.

Salute!
I don't think BeerSmith lists this on the recipe itself. You have to preview/print the "BrewSheet." This is printed instructions on how to brew the beer. Also, the numbers will only be accurate if you know (and tell BeerSmith) what your pre/post boil volumes are (ie how much you expect to boil off). Obviously, there are several variables including the length of the boil (60-90+ min), how hard the boil is, and the size/diameter of the pot.


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