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pre boil efficiency calculator?

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boxcar

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Post Mon Jul 21, 2008 3:21 pm

pre boil efficiency calculator?

I am currently in the middle of my boil, and would like to calculate my efficiency using my pre boil gravity reading. is there a calculator out there that I can enter my pre boil gravity and volume, then put in my projected post boil volume, and figure out efficiency.


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Shadetree

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Post Mon Jul 21, 2008 3:30 pm

You can’t calculate efficiency from pre- and post-boil gravities and volumes alone. You need total potential gravity from the extract, sugars, and grains, and either the pre-boil or the post-boil gravity along with the relevant volume.
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boxcar

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Post Mon Jul 21, 2008 3:32 pm

I do, of course have my grain bill and what not. I did after all, make the beer :lol:
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Shadetree

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Post Mon Jul 21, 2008 4:45 pm

Sorry, wasn't clear from your OP.

If you know the recipe, then you can use any of the on-line calculators, such as The Recipator: http://hbd.org/cgi-bin/recipator/recipator
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BrettM

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Post Mon Jul 21, 2008 6:49 pm

if you're using software to calculate your efficiency, just up the batch size to your pre-boil volume and play with the efficiency number until you hit your measured pre-boil gravity.
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SenorPantalones

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Post Mon Jul 21, 2008 7:15 pm

It's just the same formula. gravity units (volume of wort x actual OG) divided by amount of grain x gravity potential

So 10# of base malt yielding 5 gallons of 1.050 wort would be
5 x 50 / 10 x 36 = 69.4% efficiency
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FRNX

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Post Tue Jul 22, 2008 7:11 am

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Karl750

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Post Tue Jul 22, 2008 10:48 am

He has a general equation for efficiency and a specific one based on the types of grain.

http://www.howtobrew.com/section2/chapter12-5.html
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