Gravity Calculations

Fri Nov 04, 2005 7:03 pm

FYI: I am an extract brewer who is going/researching AG. Here is my AG question...

If I know my OG after boil is to be 1.050 and my evaporation rate is for example 15%/hr, how do I calculate what my wort gravity should be before the boil? Am I over thinking this?!?

Another question please...

If I miss my target gravity after boil, can I merely add some DME to compensate?

Here is an example after boil:
Have 5 Gallons of wort with a gravity of 1.045
My target gravity is 1.060

What type of calculation/modification is needed to compensate with DME?

I guess, since the wort is already boiled, I would have to add in another gallon of water to the mix because I would have to boil the added DME correct?

I really think I'm over thinking this and perhaps bothering you guys with these types of questions. Hope not!


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Fri Nov 04, 2005 7:10 pm

Almost forgot my original question.

What percentage of water does grain absorb? Have to calculate for that also :?:
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Sat Nov 05, 2005 5:38 am

There some pretty good recipe calculators here
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Sat Nov 05, 2005 5:46 am

I'm with Heath. Get a copy of Promash or Beersmith. That or use an online calculator. The programs are only ~$20.

A very silly place...

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Sat Nov 05, 2005 1:47 pm

Thanks for the info. I will pick up a program!
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Sat Nov 05, 2005 2:50 pm

I am fond of Beer Smith

Just think, I used to do that by hand once :shock: :wink:

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Dogger Dan
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Sun Nov 06, 2005 7:16 am

There are some calculations you can use if you want to do the math. Check out if you want to know the math behind it. I have both Promash and Beersmith and I prefer just to be lazy and use one of them.
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Sun Nov 06, 2005 8:13 am

Ray Daniels' "Designing great beers" is one of my favorite books. He explains the math and process pretty well in chapter 6
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Dr Scott
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