I've seen a lot of threads on tips and ways to maximise the efficiency of your wort from the mash, but I'm still a bit confused as to how you would come up with that percentage. I've been trying to find a topic that goes over how to do this, but I can't seem to find one. Is there a topic or anything that goes over the measurements, variables and math needed to calculate out your efficiency accurately? Or maybe a spreadsheet or online calculator or something?