sorry but i definitely think this is a calculator error. Maybe another way to show it more clearly is to use one profile with 5ltr boil off and 2 ltrs of kettle losses. then compare this to a second profile with 7 ltr of boil odd and zero kettle losses. if you use any recipe set to fermentor...

not sure what i've set up in correctly in my profile. I set up a test profile as stated above and it show a pre boil of 1.034 and FG of 1.045 if you use the separate boil off calculator under tools enter 28 ltr and 1.034 and target volume of 23ltr (post boil volume) you'll get post boil gravity...

it looks like BF doesn't factor in kettle losses when calculating post boil gravity I've posted details here viewtopic.php?f=5&t=3403

there seem to be an error in the way BF calculates Pre boil gravity if I have a 21ltr batch size (fermentor target) and a 5 ltr boil off with 2 ltr kettle dead space for a final gravity of 1.045 I'll have a pre boil volume of 28ltr with a gravity of 1.037 but BF shows a pre boil of 1.034. it...

Is there any way to adjust the fermentablity of different grains? eg sugars from steeped crystal which are less fermentable than sugars from malt extract