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Old 01-27-2012, 05:24 AM   #1
frozt
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Jan 2012
Boone, NC
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Hello all,
I recently discovered hopville and have been happily tweaking away with it's recipe calculator. I was just browsing the featured recipes when I noticed that none of the OG,FG, or ABV calculations in them seem to match mine. For instance, this recipe:
http://hopville.com/recipe/1102225/b...rty-blonde-ale

By my calculations, the expected OG should be 1.063, but hopville claims 1.059.
((6×45)+(1×28)+(.5×34))÷5 = 63

Likewise, the ABV calculation at the bottom doesn't appear to use any of the numbers on the recipe page. Using the page's listed (OG-FG)*131.25 yields a different number, as does the same calculation using the listed attenuation.
Is hopville an inaccurate source for brew calculations, or is my math wrong?

Thanks
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Old 01-27-2012, 08:43 AM   #2
fredbclem
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Jan 2012
Pensacola, FL
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Well it doesn't seems that your maths is wrong. Then why it is so?
It has confused me also.
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Old 01-27-2012, 12:54 PM   #3
Dr. Francois
 
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Okemos, MI, Michigan
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I have noticed it, too.
I brew session beers, and I can't get the abv to dip below 3.0 on the calculator. I can modify the gravity, but the ABV stays put.
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Old 01-27-2012, 08:54 PM   #4
KevinW
 
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Gladstone Oregon, Oregon
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Is the "mash efficiency at 75%" your actual efficiency or is that the percentage that Hopville is using to calculate your gravity?

I am just wondering since that seems like the only "variable" in the whole problem that may be giving different numbers than what you have!

Good luck in figuring this one out!
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