Beersmith's reported pre-boil and post-boil gravity estimates appear to be off. For a simple test, I have created an all-grain recipe in beersmith 2 using an unmodified equipment profile:
Type: All Grain
Equipment: Pot and Cooler (10 Gal/37.8 L) - All Grain
Batch Size: 5.50 Gal
Ingredient: 10 lbs Pale Malt (2 Row) US
The following fields are calculated by beersmith:
Est Pre-Boil Vol: 7.89 Gal
Est Pre-Boil Gravity: 1.039 (39 gravity units)
Post Boil Vol: 6.76 (found in the Equipment profile page)
Est Original Gravity: 1.048 (48 gravity units)
I would expect the following formula to hold true:
(Pre-boil Vol) x (Pre-boil gravity units) = (Post-boil Vol) x (Post-boil gravity units)
Plugging in beersmiths values, I get:
7.89 x 39 = 6.76 x 48
307.71 = 324.48
In order for this to work, the Est Original Gravity needs to be 307.71 / 6.76 = 46 (or 1.046 SG).
My calculation can be verified using this calculator (the second one on the page):
http://www.brewersfriend.com/dilution-and-boiloff-gravity-calculator/
Why is beersmith reporting an est original gravity of 1.048 instead of my calculated value of 1.046? Am I missing something here?
Type: All Grain
Equipment: Pot and Cooler (10 Gal/37.8 L) - All Grain
Batch Size: 5.50 Gal
Ingredient: 10 lbs Pale Malt (2 Row) US
The following fields are calculated by beersmith:
Est Pre-Boil Vol: 7.89 Gal
Est Pre-Boil Gravity: 1.039 (39 gravity units)
Post Boil Vol: 6.76 (found in the Equipment profile page)
Est Original Gravity: 1.048 (48 gravity units)
I would expect the following formula to hold true:
(Pre-boil Vol) x (Pre-boil gravity units) = (Post-boil Vol) x (Post-boil gravity units)
Plugging in beersmiths values, I get:
7.89 x 39 = 6.76 x 48
307.71 = 324.48
In order for this to work, the Est Original Gravity needs to be 307.71 / 6.76 = 46 (or 1.046 SG).
My calculation can be verified using this calculator (the second one on the page):
http://www.brewersfriend.com/dilution-and-boiloff-gravity-calculator/
Why is beersmith reporting an est original gravity of 1.048 instead of my calculated value of 1.046? Am I missing something here?