AA% conversion

Hey guys
I'm trying to convert a simple hop schedule to hit the desired IBU mark. The hops my LHBS carries are 4.5% and the recipe I am going from used 5.0%.

The recipe adds 1.0 oz Kent Goldings (5.0%) at 60 minutes, for 17.2 IBU. How many ounces of Goldings do I need to add at 60 minutes to hit 17.2 IBU?

Recipe: 1.0oz (5.0%) 60 min = 17.2 IBU
Me: ???oz (4.5%) 60 min = 17.2 IBU

Here is the equation.

IBU = [W(oz)*AA%*U*7489]/V(gal)

the answer would be 1.02

IBU = [1.02*0.045*0.25*7489]/5

You can see by this that it doesn't matter much as I have found in brewing, ballpark is close.

humann_brewing said:

Here is the equation.

IBU = [W(oz)*AA%*U*7489]/V(gal)

the answer would be 1.02

IBU = [1.02*0.045*0.25*7489]/5

You can see by this that it doesn't matter much as I have found in brewing, ballpark is close.

Click to expand...

It's monday morning and maybe the answer is obvious, but what does U represent?

A4J said:

It's monday morning and maybe the answer is obvious, but what does U represent?

Click to expand...

U is the time, .25 is for 60 minutes. Here is the article.

http://***********/stories/recipes/...ating-gravity-bitterness-and-color-techniques

humann_brewing said:

U is the time, .25 is for 60 minutes. Here is the article.

http://***********/stories/recipes/...ating-gravity-bitterness-and-color-techniques

Click to expand...

utilization [time]. That's what I figured.

grassy-ass.

Divide 5 by 4.5 = 1.1 oz.

Thanks guys!