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 Home Brew Forums > crap I forgot to calculate my pre-boil

10-14-2012, 02:48 PM   #1
ThePonchoKid
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 crap I forgot to calculate my pre-boil

I've been doing 7.25 gal for 10 lb grain brew. This time I'm doing 13lbs of grain in my boilermaker 10. I tried a calculator online but it has confusing entries that are perhaps more designed for mash tuns?

Would anyone tell me how much water I need here?

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10-14-2012, 03:13 PM   #2
ThePonchoKid
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bah even this simple biab calc is punching out numbers that make no sense to me

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10-14-2012, 03:18 PM   #3
dbrewski
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If you are asking about grain absorption, try using .16 gallons per pound of grain. If 7.25 worked for you for 10lbs, the additional 3 lbs would absorb .16*3 = .48 or about half a gallon additional. So roughly 7.75G instead of 7.25G. Does that sound right?

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10-14-2012, 03:19 PM   #4
bduane
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Grain absorbs approximately 0.1 gallons per pound (depending on the moisture of the grain). So, you will need approximate 0.3 more gallons.

If it were me, i'd aim a little on the high side, if my boil volume was too much, id boil a little longer to compensate.

Another option is using some "top-off" water to get up to your volume. When you are using BIAB, i don't think a 1/4 of a gallon will get you any more/less efficiency when you are boiling it off anyways.

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10-14-2012, 03:21 PM   #5
ThePonchoKid
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I think I got the number right on the simple calculator. There's just a bunch of other numbers that confused me. It's suggesting 7.61gal. That's probably spot on seeing as I squeeze the crap out of my bag Thanks for holding my hand for a second there

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