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 Home Brew Forums > Hop % to oz using BeerSmith
10-30-2012, 01:16 PM   #1
Tralmix
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 Hop % to oz using BeerSmith

Hi guys. Dumb question. Does BeerSmith have a way to convert hops by percent like the grain percent option? The recipes in Mitch Steele's IPA book has hops listed at a percent. Or how do I figure out %?

Example:

Start of boil use 23.3% of 17.7%aa CTZ hops

So how many oz would 23.3% be for a 5 gallon batch?

Keith

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10-30-2012, 01:34 PM   #2
billl
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I don't know about the software, but this is an algebra problem.

Take the % x Total x utilization x AA% for each addition. When you add all those together, they equal the total IBU. Then you solve for "Total". You'll need a utilization chart based on boil minutes and gravity.

Alternatively, if you don't like algebra and charts..... plug in 1 oz for the bittering addition and scale the rest based on the percentages. eg if the bittering addition is 23% and the 15 minute addition is 40%, 1 oz bittering means 1 x 40%/23% = 1.74 oz at 15 minutes. Plug all those in to your program to calculate IBU. Whatever % your IBU is off, multiple all the additions by that amount. eg. if you are 10% low, the 1 oz bittering becomes 1.1 oz and the 1.74 @ 15 minutes become 1.91 oz.

BTW - what recipe are you trying?

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10-30-2012, 01:41 PM   #3
stratslinger
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You could do the algebra approach that bill suggests. Or, you can plug in everything using your recipe's %aa values and record your IBU values. Then, correct the %aa to actual, and use the adjust IBU feature in Beersmith, which will adjust the hop amounts upward or downward as necessary.

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10-30-2012, 01:49 PM   #4
Tralmix
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Thanks guys. Did I mention I hate math? lol

The example was from Fat Heads Headhunter IPA, but I want to try the Stone 14th Anniversary IPA. The Fathead IBU target is 87. Guess I forgot to mention that as it looks like it is a big contributing factor.

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12-21-2012, 02:25 AM   #5
TheCrackpot
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The percentages in Mitch's book are the percentage of the total hop weight, not the percentage of contribution to the total IBU.

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