rferguson61
Well-Known Member
If i know the OG and the abv is there a way to find what the FG should be?
The OG is supposed to be 1.047. ABV is 4.9%
The OG is supposed to be 1.047. ABV is 4.9%
Final Gravity?
- Thread starter rferguson61
- Start date
Help Support Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum:
The final gravity will depend on your grain bill, your extract/brewhouse efficiency, fermentation temperature, and the attenuation of the yeast you are using.
What was your grain bill, your estimated efficiency, fermentation temperature, and the type of yeast you used?
What was your grain bill, your estimated efficiency, fermentation temperature, and the type of yeast you used?
rferguson61
Well-Known Member
a little over 7lbs LME
1/2 lb munich malt
1/4 lb 40L
1 lb flaked wheat
White Labs American Hefe Yeast
and its fermenting 69-71
1/2 lb munich malt
1/4 lb 40L
1 lb flaked wheat
White Labs American Hefe Yeast
and its fermenting 69-71
ThePearsonFam
Well-Known Member
WLP320 American Hefe Yeast is 70-75% attenuative. Although it isn't a direct calculation (due to mash temperatures and grain bill considerations), you can roughly assume the the FG will be between:
47 * .7 = 32.9, so 1.047 - .0329 = 1.014
and
47 * .75 - 35.5, so 1.047 - .0355 = 1.012
That's what you'd expect to see...
Since you know your OG and ABV, I'd just go here: http://www.rooftopbrew.net/abv_calculator.php and use the calculator. Just type in your guess for the FG until you get to the ABV you know. In your case, the FG is 1.010.
47 * .7 = 32.9, so 1.047 - .0329 = 1.014
and
47 * .75 - 35.5, so 1.047 - .0355 = 1.012
That's what you'd expect to see...
Since you know your OG and ABV, I'd just go here: http://www.rooftopbrew.net/abv_calculator.php and use the calculator. Just type in your guess for the FG until you get to the ABV you know. In your case, the FG is 1.010.
rferguson61
Well-Known Member
dcp27 said:
I know what its suposed to be
ThePearsonFam
Well-Known Member
that's funny, fuzzy math
imperialipa
Well-Known Member
I dont think this is one of the things you can figure out backwards. You have to have the FG anf OG to get the ABV.... How can you "know" what its supposed to be?
rycov
Well-Known Member
probably what the recipe is supposed to make. or a clone of something else with that abv. he said he knew what it was "supposed" to be.
rferguson61
Well-Known Member
Its a widmer hefe clone. Theirs is 4.7 abv
whats fuzzy about it? its exactly how to correctly figure it out
ThePearsonFam
Well-Known Member
sorry, misdirected post... funny and fuzzy was intended to address "assuming the ABV is 4.7% to determine FG" vice knowing the OG and FG to determine the ABV...
