I want to learn bear math. Bobby_M's website was very useful in understanding and learning about efficiency and the math to figure it, but I would also like to learn how to calculate what FG should be for a given recipe. I know a lot of people just plug the numbers into a beer program. I would rather learn how to do the calculations than have to buy a program to do them for me. Can anyone point me in the right direction or provide a link to a site I could learn from?