should I add to my total boil volume?

[whitehause]

I posted this on the beginner forum and didn't really get an answer, so I figured this might be a better place to post.
I was running some numbers for my first AG through "Nelsons Beer Quick calculator" (pretty cool program!) and it has a boil number and a batch number.(in gallons) When putting the data in for a 5 gallon batch, should I go with 6 and 5 gallons(boil and batch)based on 60 min boil with 1 gallon evap, or 6.25/5.25 to account for the trub in order to end with a true 5 gallons in the fermenter. This program accounts for grain absorption, but I'm sure trub loss isn't taken into consideration. I'm planning a biab with a dunk sparge in a separate pot of strike water, and a full volume boil. I'm also looking at 1/1.25 grain to water. should I bump this up a bit 1/1.5 or more. I could probably do a true BIAB full volume mash, but I like the idea of a little sparge to bump my efficiency a bit. I'm trying Edworts haus ale(with pellet hops)....seems pretty straight forward, and a lot of people seem to like it. With only one type of hops, I can focus on my process insted of worrying about multiple additions of different hops, spices, ect. Any advice would be greatly appreciated!

 

[Kaz]

I usually plan on losing a full gallon from post boil to bottling. Leave .5 gallon behind in the kettle with break material and hops etc and leave .5 gallon behind in the carboy with the yeast cake and trub. So, I start with about 7.25 gallons pre-boil, boil off about 1.25 gallons over an hour, 6 gallons in the kettle, 5.5 gallons to the carboy and 5 gallons to the keg/bottles.

 

[PT Ray]

Batch size is going to be your post boil volume. If you're anticipating a lot of trub, increase your batch size. After a couple batches you should have a general idea of how big your post boil volume will need to be in order to get you a full 5 gallons into bottles.

It would do something like 5.5 gallon batches. That would put 5.25 into the fermenter and close to 5 into the keg/bottles.