web "Beer Tools" IBU determination

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web "Beer Tools" IBU determination

Postby DancingBear » Mon Dec 18, 2006 2:51 pm

Hi,

What is the is the formula for the

Thanks
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Postby DancingBear » Tue Dec 19, 2006 1:16 pm

Sorry, first post cut off

What formula does web Beer Tools use to determine IBUs?
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Postby jeff » Tue Dec 19, 2006 4:52 pm

DancingBear wrote:Sorry, first post cut off

What formula does web Beer Tools use to determine IBUs?


GOLD members have a choice of 7, trial members use my formula.
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Postby DancingBear » Tue Dec 19, 2006 5:46 pm

I am a gold member. :|

I have access to all web version types.

What is "Your" formula please.
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Postby jeff » Tue Dec 19, 2006 6:53 pm

DancingBear wrote:I am a gold member. :|

I have access to all web version types.

What is "Your" formula please.


It goes something like this:

U = Utilization
B = Boil Minutes
SG = Boil Gravity

U = 8.02e-9 * (B * SG ^ -4.0523) ^ 4 - 1.91599e-6 * (B * SG ^ -4.0523) ^ 3 + 1.021645e-4 * (B * SG ^ -4.0523) ^ 2 + 4.03607504e-3 * (B * SG ^ -4.0523)
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Postby jeff » Tue Dec 19, 2006 7:15 pm

Forgot to add that the formula is for this range:

0 <= B <= 112.868
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Postby jeff » Tue Dec 19, 2006 7:17 pm

One more thing. Multiply U by 1.14 if using pellet hops.
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Postby JimInNJ » Thu Dec 21, 2006 10:33 pm

How does this compare to the formulas in Beer Tools Pro?

I just downloaded Beer Tools Pro and it is showing 48 IBUs for a recipe that was 38 IBUs online.

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Postby jeff » Thu Dec 21, 2006 10:39 pm

JimInNJ wrote:How does this compare to the formulas in Beer Tools Pro?

I just downloaded Beer Tools Pro and it is showing 48 IBUs for a recipe that was 38 IBUs online.

- Jim


Choose Session->Utilization to open the utilization algorithm editor. You can select several methods of calculating utilization using this utility. The BeerTools.com formula is listed as 'Fowler' (me). Choose this formula and see what effect it has on the IBU calculation. The recipe on the site may use a combination of formulas if the recipe was posted by a gold member. Look under the 'Individual Hops', to see which formula(s) the author selected.
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