Thanks for the update and calculations Big Monk, haven't been to the LO site in a while. I used the calculations you provided to check my last brew additions. SMB and AA was right but I was under dosing the Brewtan B maybe because of the % amounts thing. The guidelines for BtB are 2-4g per Hectoliter so at 3g per Hectoliter that's about .9g for my 8 gal mash. I have always liked math and prefer the calculations to a spreadsheet. I printed a copy of your formulas, thanks for setting me straight.