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Old 01-27-2012, 05:24 AM   #1
Jan 2012
Boone, NC
Posts: 102
Liked 2 Times on 2 Posts

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:

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?

Bottled: Modded Sierra Madre Pale Ale, Irish Red, Ska True Blonde Clone, Chocolate Stout (Partial Mash), Dead Ringer IPA (Partial Mash), Cider, Dead Ringer IPA (Extract), Orfy's Mild(AG), Busty Brunette Blonde(AG), Dead Ringer(AG), Chocolate Stout(AG), Pumpkin Ale(AG), Tits Up IIPA(AG)
Planned: Framboise

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Old 01-27-2012, 08:43 AM   #2
Jan 2012
Pensacola, FL
Posts: 1

Well it doesn't seems that your maths is wrong. Then why it is so?
It has confused me also.
weight watchers diet

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Old 01-27-2012, 12:54 PM   #3
Dr. Francois
Dr. Francois's Avatar
Jan 2009
Okemos, MI, Michigan
Posts: 614
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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.
Dr. François

"We are what we pretend to be, so we must be careful about what we pretend to be."
--Kurt Vonnegut

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Old 01-27-2012, 08:54 PM   #4
KevinW's Avatar
Dec 2009
Gladstone Oregon, Oregon
Posts: 1,132
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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!
“I don't drink beer all the time but I can drink (a) beer anytime" - Me

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