Thanks for the replys, I understand what it means, but not sure how to get there.
For example - These are estimates
For a 5GL Recipe
Started with 3 gl
After mashing added 2.5 gl (pot wouldn't hold grains and all the water).
After boil added another gallon of water to bring volume...
New brewer here a few extract kits and 1 recent BIAB....I'm hooked! The efficiency part confuses me; do I need to know what I am getting if I am not forming my own recipes?
I have found the calculators but still confused, would rather not mess with it at this point.