HopShot IBU Calculation

brewfun said:

Extracts are not easily handled in BeerSmith, yet. Their growing popularity makes that accommodation inevitable, but until then, you'll have to compromise a little.

Luckily, Northern Brewer gives us a key for calculating the bitterness of Hopshot. http://www.northernbrewer.com/documentation/hopshot.pdf

To get a 1 mg dose to project as 10 IBU, the extract has to carry 70,000% AA. But, most brewers use either ounces or grams, so you'll want to adapt that number to your preference.

The relationship of 2.43% AA = 10 IBU as 1oz makes sense, but why not turn the number into something you can use for both inventory and ordering? Why not make 1 ounce or gram equal an entire container of Hopshot? That way, anything less than a whole number is a percentage of the container.

So, one syringe of Hopshot is 5ml, or 50 IBU in 5 gallons (19 l).
As a gram, a Hopshot syringe would be 345% AA each.
As an ounce, a Hopshot syringe would be 12.17% AA each.

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Teekay92 said:

Just want to double check that I am going about this correctly...

To get a correct IBU calculation, I would just change the AA in the HopShot's ingredient profile to "12.17%" correct?

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brewfun said:

Yes.

What I did was convert the bittering potential of a whole syringe into an "ounce" equivalent. So, if you have 2 syringes, you have an inventory of 2  "ounces." The result should be that if you use a whole syringe, you should get 50 IBU in 5 gallons (assuming an OG of 1.050).

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