Hop math question

[Killian_77]

I am looking into a recipe that calls for this hop schedule:
1.5oz Goldings (4.1%AA) 60-min.
0.25 Goldings (4.1%AA)10-min.

If my goldings are 5.0%....I should back it down to this schedule:
approx 1.25oz 60min
.25oz at 10min (I think difference is negligible)

Am I correct in my calculations? Will this make that big of a difference?
This is an Irish Red Ale recipe if that matters.
Thanks!

 

[Got Trub?]

Your calculations are correct. You are also correct that the 10min addition is negligible, also measuring anything less then 0.25 oz is difficult with most scales.

GT

 

[Grinder12000]

Yea - you could do that but honestly - I would not bother unless you are into saving .25 hops. My thinking is that OK - the recipe says this but this is such a minor "problem" it might turn out better.

Unless you are trying to recreate a recipe yo have already done once to perfection.

 

[homebrewer_99]

Here's the math:

4.1 divided by 5 = .82. That's how much your 5% equals for 1 oz of the 4.1%.

For the remaining 1/2 oz it'll be .41 oz (half of the .82) of the 5%.

.82 + .41 = 1.23 oz (of the 5%)