Figuring the FG at 78 degrees F - Home Brew Forums

 Home Brew Forums > Figuring the FG at 78 degrees F

08-28-2010, 06:10 PM   #1
alliloop
Recipes

Dec 2009
Charleston, South Carolina
Posts: 40
Liked 1 Times on 1 Posts

Hellooo,

Ok, so I'm trying my best to figure myself out when it comes to the hydrometer readings and final gravity and all that stuff. I'm not simply asking for the answer, but to also understand how it's figured out.

I made a Bell's HopSlam IPA (and it smells and tastes great!), with a dry hop in the secondary. My FG reading was at 1.018. I measured it at 78 degrees F. I'm seeing in various places various numbers to add to get the actual FG, so I'm not sure which to believe.

Am I correct to assume if it's 78 but should be 60 degrees, and I should follow the one that says I should add between .002-.003 for every 10 degrees, then my 1.018 should gain .005ish making it 1.023?

And, if that is correct and my FG is 1.023, and my OG was 1.065, then my ABV will be... (1.065 - 1.023 = 42 x .1414 =) 5.9%???

If I got it, yay!
If I don't... help! Please break me down with the correct info. THANKS!

---
Upcoming brew: Fish Tale Trout Stout clone
Upcoming brew: Raspberry Wheat
Fermenting: Community Coffee Chicory Stout
Bottled: Bell's HopSlam IPA
Drinking: Belgian White
Drinking: ESB
Drinking: California Commons

08-28-2010, 08:28 PM   #2
Malticulous

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Aug 2008
St. George Utah
Posts: 4,146
Liked 72 Times on 57 Posts

at 77F it's +2, at 70 it's +1. The hotter the more you need to add. 83F is +3 and 89F is +4. Temps much higher than that don't give very accurate readings.

http://www.howtobrew.com/appendices/appendixA.html
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08-28-2010, 08:35 PM   #3
Airborneguy

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Sep 2009
Isle of Staten
Posts: 10,886
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I've never had a problem taking my readings straight out of the mash or boil. I think the highest I ever plugged in to Beer alchemy was 186ºF and still got an accurate reading. If you have a brewing program, many will make the calculations for you.
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08-28-2010, 08:41 PM   #4
Malticulous

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Aug 2008
St. George Utah
Posts: 4,146
Liked 72 Times on 57 Posts

At 186F it's cooling fast and the each degree has a huge impact on the reading. I put mine in a coffee cup in the freezer until it's under 100F. That hot will ruin my test jar.
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08-28-2010, 09:58 PM   #5
Airborneguy

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Sep 2009
Isle of Staten
Posts: 10,886
Liked 856 Times on 626 Posts

True, but if you take the temperature reading at the same time as the hydro, that's not an issue.
__________________
Fermentor(s):
Lagering:
Bottled: Atonement Brown Porter

09-20-2010, 11:15 AM   #6
alliloop
Recipes

Dec 2009
Charleston, South Carolina
Posts: 40
Liked 1 Times on 1 Posts

Thanks all. I don't know what exactly I did, but my goodness is this strong! After 3 and you're knocked on your arse!
Definitely will be making the HopSlam again.

Bottled: Fish Tale Trout Stout clone
Bottled: Community Coffee Chicory Stout
2nd Ferm: Raspberry Wheat
Nearly Gone: Bell's HopSlam IPA
Drinking: Belgian White
Drinking: California Commons
Done, Need More: ESB