Compensating FG when overshooting OG? - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Compensating FG when overshooting OG?

Thread Tools
Old 05-05-2010, 12:51 AM   #1
BucksPA's Avatar
Dec 2009
Bucks, PA
Posts: 449
Liked 5 Times on 5 Posts

anybody ever do that before? I know you could do a variety of things to fix the OG, but what about just leaving it as is and taking away from the FG?

for example, recipe calls for OG 1.050 and FG of 1.010.
drunken homebrewer doesn't pay attention to his recipe and lands at 1.060. How about calling it done at 1.020 instead? what effect would it have? I know that if I bring it down to intended FG then i just have a stronger beer and i dont win any awards, and taste may be a little drier. more curious about compensating and stopping at 1.020.


edit....I actually did this on my orange pale ale and added more water to my boil, but i was contemplating just leaving it at 1.060 and stopping at 1.023 vs 1.013. My OG was supposed to be 1.050.
40 Gallons brewed in 2013....and counting
33 Gallons brewed in 2012
159 Gallons brewed in 2011

My Brutus 10

Reply With Quote
Old 05-05-2010, 12:58 AM   #2
ArcaneXor's Avatar
Nov 2007
Posts: 4,573
Liked 118 Times on 105 Posts

It should finish around 1.012-1.013ish, depending on the yeast strain. Stopping the fermentation early is something I have never done - the beer obviously can't be bottle conditioned if you do this. Adding 10 points to the FG if you overshoot your OG by 10 pts will give you a much sweeter beer. Instead of keeping the difference between OG and FG constant, try to keep your attenuation constant - that should get you closer to what you expected from the original beer.

I usually just dilute the wort with extra water if I overshoot my OG significantly.

Reply With Quote
Old 05-05-2010, 01:14 AM   #3
Mar 2009
Posts: 395
Liked 8 Times on 7 Posts

Since it looks like you keg, you could in theory kill off the yeast and force carb it, but there's a couple issues I can think of with stopping a fermentation early. First there's the fact that you're going to end up with a sweeter beer than you would otherwise. A 5% beer with an FG of 1.013 isn't going to taste the same as a 5% beer with a FG of 1.023. I'd also think you would have issues with being able to replicate a recipe if you decided you like it. You'd have to keep a really close eye on the fermentation and make sure you stop it at the same spot, otherwise you'll have a different beer than you did before. I think this is probably why you would normally dilute before fermentation instead... plus you end up with more beer that way.

Reply With Quote
Old 05-05-2010, 01:41 AM   #4
Zen_Brew's Avatar
May 2009
Posts: 1,864
Liked 23 Times on 23 Posts

Agree with above posters. The gain in sweetness with an FG of 1.020 vs 1.010 is going to be a much much greater deviation in the beer flavor, then the additional alcohol you'd have by letting it finish out where it will naturally will, likely somewhere in the 1.011 to 1.013 range.

If it is a super critical issue to you for some reason, the better bet would be dilluting the wort to 1.050-ish with pre-boiled water.
Primary: German Hef, Belgian IPA, Scottish 80, Belgian Dubbel
On Tap: Oatmeal Stout, Vanilla Oatmeal Stout, Belgian Dark Strong, Munich Dunkel, Dunkel Weizen, Oktoberfest, Bock, IPA, Black IPA, English IPA, Pale Ale

Using the mind to look for reality is delusion. Using your senses to look for reality is awareness.

"One time I was so desperate for a beer I snuck into the football stadium and ate the dirt under the bleachers." Homer Simpson

Life, Liberty, and the Pursuit of Hoppiness

Reply With Quote
Old 05-05-2010, 01:45 AM   #5
sambogi76's Avatar
Sep 2009
Carbondale, IL., Illinois
Posts: 154

Another thing to mention is your IBU's will differ due to lower utilization of hops because of the higher pre-boil gravity.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Does overshooting your OG mean a high efficiency? Bulls Beers All Grain & Partial Mash Brewing 14 01-08-2009 04:15 PM
Effects of overshooting FG Scuba Beginners Beer Brewing Forum 2 12-22-2008 11:30 PM
Overshooting OG effects Jaybrinks All Grain & Partial Mash Brewing 14 10-25-2008 02:43 AM
Compensating for small boil kettle Soperbrew All Grain & Partial Mash Brewing 4 04-10-2008 10:26 PM
Compensating For Trub Loss gibfried Extract Brewing 13 09-25-2005 04:33 PM

Forum Jump