Simple Maths - AA% Calculations

[VillageBrew]

According to my schoolboy maths, if a recipe calls for a specific weight of hops at a specified AA%, then if the hops available are at a lower AA% then you simply multiply to make up the difference. Eg - the recipe I brewed yesterday called for 32g of hops at 4.5%AA; mine were rated at 3.0%AA so I should have added 48g (ie 1.5 x the original weight). Is that right or am I over-simplifying it?

The resulting wort tasted spot on, but I was wondering if I managed this through luck rather than judgement!

 

[MyQul]

I'm **** at maths and cant answer your question. I just use brewing software (brewmate) to work this kind of thing out. But here's how john palmer suggest doing it. Perhaps it sheds some light on what your asking

http://howtobrew.com/book/section-1/hops/hop-bittering-calculations

 

[nigelnorris]

I'm **** at maths and cant answer your question. I just use brewing software (brewmate) to work this kind of thing out. But here's how john palmer suggest doing it. Perhaps it sheds some light on what your asking

http://howtobrew.com/book/section-1/hops/hop-bittering-calculations

Yes that is suggesting exactly the same thing.

 

[Bigcol49]

32g of hops at 4.5%AA; mine were rated at 3.0%AA so I should have added 48g (ie 1.5 x the original weight). Is that right or am I over-simplifying it?

Hi!
Just to add another affirmative voice:
32 x 4.5 = 144 AAU
If your hops have a different %AA, divide the AAU by the %AA
144 ÷ 3 = 48g

 

[VillageBrew]

Thanks all - it sounded right according to the voices in my head, but they can't always be trusted! :nono:

 

[MyQul]

Thanks all - it sounded right according to the voices in my head, but they can't always be trusted! :nono:

Especially when there're telling you to drink Fosters :lol:

 

[Clint]

Philistine. ...