So I completed my first all-grain batch yesterday and my first attempt at calculating eff. produced this question:

Do I use the 6 gallons of pre-boil wort in my initial calculation or the 5 gallons post-boil?

I ask this because I have to do split boils and didn’t take a gravity reading until everything was cooled down and combined into the primary (before pitching). However, after sparging I actually had 6 gallons of liquid and if I’m calculating correctly my eff. would be terrible when using 5.

My calcs are:

OG 1.034 (34) * 6 gal = 204 pts

204 / 8 lbs pale malt = 25.5 ppg

25.5 / 36 (max eff. for pale malt?) = 70.83%

but at 5 gallons it goes down to 59.03%