Why are the ingredient amounts different from the recipe, even though my batch size is exactly the same?
There are a few reasons why the calculations can differ from the recipe:
- If your efficiencies are different from the recipe, the batch calculations will be different;
- The calculations take into account your equipment losses, and really it’s calculating based on your end of boil volume (EOB), not the batch size. So, if the batch size is 20 litres, and you’re EOB is 23 litres, the calculations account for those losses.
- Hop amounts are calculated according to their bittering power, and not by a linear scaling method. So, if your hops are less potent than what the recipe calls for, more will be added, and if the bittering power is greater than what is expect, less will be called for.
Why is the Alpha Acid (AA) different than what I inputed?
The sheet shows the bittering power of hops as “AA” (alpha acid), but to be honest, this is a misleading title. It should read “Bittering Power”, but I didn’t make enough room on the sheet to account for this oversight. When I first created the sheet, I was only using the alpha acid to represent the bittering power of the hop, but I’ve since upgraded the bittering calculations to include cohumulone percentage and the age of the hops. Both of these factors have an impact on hop bitterness, which will give a different bitting power than the alpha acid rating.
How do I import my old recipe data into a new version of the sheet.
At the moment, you can’t. It’s something I’m working on.
Do you offer the sheet in U.S. Customary Units?
No. I would like to, but it’s going to be a huge undertaking on my part. Many have suggested that it would be a piece of cake, but because there are many and very complicated formulas that are expecting values in metric, I’m bound to encounter many problem areas as I make the change. But, as there are so many users that are American, I do plan on making a version that supports U.S. Customary Units.
Questions? Send them to me.