how do you calcuate ibu's

Physics, chemistry and biology of brewing. The causes and the effects.

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Pale Ale
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how do you calcuate ibu's

Post by stouts » Wed Jul 24, 2002 7:27 am

how do you calcuate ibu's in homebrew?

Strong Ale
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Check a brewing book...

Post by dartedplus » Wed Jul 24, 2002 8:16 am

Most brewing books will gove you a simple formula to figure this out. I'm not going to put it here because you also need to consult the hops utilization chart to get part of the equation. So giving you the equation would not help without the chart. This should just give you a good reason to go out and buy yourself a homebrew book from the very many that are available. I'm sure if you ask, many of us would give you advice on which one. I personally have Papazian's "Joy of homebrewing". Some of his stuff is outdated and I know there are newer books available. So just check out the links provided here or ask what some of the other guys think. Ed

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Post by KBrau » Wed Jul 24, 2002 9:45 am

G = (IBU x L) / (1000 x AA x U)

Where :-
G = grams of whole hops to add (for pellets use 10% less)

IBU = required IBU level (for example 20)
L = litres of wort
AA = alpha acid level of hops (i.e. for 4% use .04 in formula)
U = utilisation factor (it depends on time in boil and level of SG) . . .

for practical purposes (normal strength of beer of about SG 1.040), use the following :-

Time in boil U
15 minutes 0.08
30 minutes 0.15
45 minutes 0.27
60 minutes 0.30

Hope this was helpful and if you are still looking for a homebrewing book, I recommend Homebrewing for Dummies.

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