I'm reading the book Designing Great Beers. Currently on chapter 6 - hitting target gravity.

I'm brewing a beer this weekend that I received the ingredient list from the Brooklyn Brew Shop Beer Making Book. It's the Rye P. A.

Either way, I thought it'd be fun to run the calculations in the book using the ingredient list I have.

9lbs Maris otter malt

2lbs rye malt

. 8lbs caramel 60

.5lbs caramel 20

I looked up online, and found the extract potential of each of these maltsto be (respectively) 1.038, 1.029, 1.034, and 1.035.

I will be making a 5 gallon batch and I'm assuming I'll have a low efficiency of .68 (first time making a 5 gallon all grain batch) just to be conservative.

Now, I haven't gotten too far into the book but it seems like all of the examples he uses, he tells you the final gravity. I want to find my potential final gravity. Is that possible to do?

I'd like to manually calculate this out. Do you have any good resources to learn the equations and how and why the equations work?

Thanks!