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 Home Brew Forums > original gravity
11-22-2010, 07:07 PM   #1
steve25
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 original gravity

how much higher will o.g. be after boil, compared to out of mash tun?

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11-22-2010, 07:12 PM   #2
Walker
I use secondaries. :p
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Quote:
 Originally Posted by steve25 how much higher will o.g. be after boil, compared to out of mash tun?
it depends on how much volume you have before and after the boil.

example:

if you measure 1.040 gravity in 7 gallons of wort in the kettle, your wort contains a total of:

40 * 7 = 280

gravity points.

If you boil this down to 5 gallons, those 280 points will be spread out in 5 gallons, so the gravity after the boil will be:

280 / 5 = 56

Leaving you with 1.056 gravity on the 5 gallons.
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11-22-2010, 07:50 PM   #3
devilishprune
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C1V1=C2V2 is a brewer's best friend.

C1=(gravity)-1 preboil and V1 is preboil volume.

C2=(gravity)-1 postboil and V2 is postboil volume.

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