Questions tagged [final-gravity]

The specific gravity at the end of fermentation.

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14
votes
3answers
40k views

Can a refractometer be used for testing final gravity?

Can you use a refractometer to test final gravity?
8
votes
9answers
15k views

How low can a beer's final gravity be?

Approximately how low can the finishing gravity of a beer be? I've been brewing from kits for about 10 years, and went all-grain last year. I wouldn't expect to see anything lower than 1.006 or so, ...
8
votes
6answers
2k views

High FG / Low Attenuation across 3 different beers

I have brewed 3 all-grain batches now that have a high final gravity: Imperial IPA: Target OG - 1.079, Target FG - 1.011, Actual OG - 1.070, Actual FG - 1.020, Yeast - US-05. Common attenuation ...
7
votes
4answers
1k views

Are the terms “dry”, “low FG” and “drinkable” synonymous?

Hopefully this doesn't fall under "opinion" but I believe this will help alleviate some questions on mashing/fermentation techniques. I guess you could break this question into parts. Also the term "...
7
votes
1answer
1k views

Why doesn't FG reach 1.000?

My second beer brew has pretty much finished its primary fermentation. It started at 1.044 and is currently at 1.014... I don't expect it will go much further. Having brewed numerous wines I ...
7
votes
3answers
7k views

How do I predict final gravity?

I've been taking the original gravity and multiplying the apparent attenuation of the yeast. For instance: 1.040 OG x 75% apparent attenuation = 1.010 expected FG But I never seem to get there. My ...
7
votes
2answers
3k views

What causes Original Gravity to be lower than it should be?

I am an extract brewer and every brew I have done the OG was lower than the intended OG, (my OG is always lower than the recipe's OG). For example I brewed the stout recipe below from beertools.com ...
7
votes
1answer
239 views

Can the final gravity be multiplied by the ratio of beer to water?

If one ends-up with, say, half as much beer as needed to float the hydrometer, is dilution a viable way to get a measurement? For instance, if one carefully measured the volume of available beer ...
6
votes
2answers
449 views

Why measure gravities?

I've brewed a good dozen batches of beer from kits, extract, extract+grain, and now all-grain, and I've never measured gravities. Why measure gravity, besides to know what you're getting? Is there any ...
6
votes
1answer
120 views

Didn't reach expected FG. Should I postpone bottling? Also: It looks weird!

I'm a newbie brewer currently trying his luck with an irish red ale kit. I've followed the instructions (which weren't complicated since it's a kit), and I've let it brew for about 6 days now (...
5
votes
2answers
178 views

Can I fix a higher than anticipated OG after primary?

I just brewed a witbier that was way below the estimated preboil gravity of 1.49. I only got 1.34 in case you're wondering. I've never had that bad of an efficiency before. The grains came ...
5
votes
2answers
91 views

Having doubts about my first stout

I just had an issue with an oatmeal stout. I'm just starting to brew beer at home (BIAB) and I think I made some mistakes. I had my water at 80°C hoping for the decrease of temperature to 72°C when ...
5
votes
2answers
11k views

Adding yeast to secondary

Okay, I am making a strong (imperial-ish) red ale. My original gravity was 1.081. I intended to bring it to a final point at most of 1.020, or if I can even lower. I was using 2 packs of WLP004 (...
5
votes
1answer
127 views

How to calculate ABV% with step feeding

I would like to make a high ABV mead, and plan to divide the honey into 3 or 4 increments for the yeast. This has to be done so that the yeast are not under stress from osmotic pressure. However, I ...
5
votes
2answers
236 views

How many gravity points will explode a bottle?

If a difference of around 3 gravity points (between primed and final gravity) will carbonate a beverage (yes, depending on style), how many gravity points will make a bottle bomb? No, I'm not trying ...
5
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3answers
2k views

Brewed an Oatmeal Stout and the gravity did not drop as much as predicted, should I re-pitch or add yeast nutrients/energizer?

I just brewed an oatmeal stout see recipe details here and I have a question about missing Orignal and/or Final gravities. The OG was supposed to be 1.061 and the FG 1.016. I brewed and got an OG or ...
4
votes
4answers
3k views

How can I reduce the ABV?

I have a batch fermenting at the moment. I had expected the OG to be 1.05x but it was 1.06x. I generally have little problem with fermentation and expect the batch to come out at somewhere like 1.0....
4
votes
4answers
34k views

Consistently high final gravity

I started brewing about a year ago, currently on my sixth batch, all using extract and some additional grains. My problem is that my beers consistently finish with a higher than expected final gravity....
4
votes
3answers
5k views

checking gravity during and after fermentation?

How could I pull out a little from my carboy to take gravity readings during fermentation? I tried to use a auto-siphon but it was a mess.
4
votes
4answers
7k views

specific gravity too high to bottle?

I recently brewed the Brewer's Best Milk Stout, which uses LME plus lactose and maltodextrin. The original gravity was 1.060, which is within the specs for offered in the instructions. Now after about ...
4
votes
2answers
309 views

Didn't get the expected O.G

I brewed a nano batch of single grain IPA and I don't know what I have done wrong. Before I started, I calculated the O.G. and F.G. as shown in the picture bellow. After boiling the wort from 5.3 ...
4
votes
2answers
245 views

FG too low to read

I bought a hydrometer to level up a bit my game, It works great for Initial Gravity measures, it has a range from 0.997 to 1.100. My problem comes when it finishes the fermentation, I get a very VERY ...
3
votes
1answer
62 views

Low FG due to cacao nibs?

I recently brewed an oatmeal cream stout from the Mashmaker book (recipe here https://growlermag.com/homebrew-recipe-oatmeal-cream-double-stout/) with the intention of adding some chocolate & ...
3
votes
1answer
304 views

Porter high OG with fermentation stopping at 1.030?

I was doing a porter/stout with extract and also steeped milled smoked malt for a more smokey flavour as part of the process (steeped in warm water around mashing temperature for about 20 minutes ...
3
votes
3answers
117 views

Pale Ale All Grain, FG not achieved

I would like your input as to why my FG was far from the theoric on from brewer's friend calculator. All Grain Pale Ale: Maris Otter 4.7k Roasted Barley 94 gr Chinook 12 aau min 60 Cascasde 5 auu ...
3
votes
1answer
353 views

What is the definition of post boil gravity and how is it different to OG?

What is the definition of post boil gravity and how is it different from original gravity - or are they both the same thing. Beersmith uses both terms but aside from the fermenter top up to me they ...
3
votes
1answer
127 views

Why is IBU/GU a good measure?

Since the FG is what measures the residual sugar in the final beer, why do we use OG, instead of FG, to calculate the ratio of the bitterness over the sweetness in final beer? How precisely is the ...
3
votes
3answers
1k views

Measuring SG on small (3.5l / 1g) batches

I do small batch brewing (3.5l-4l) and using hydrometer is a big pain for them, as I need to take very big amount of beer out to test it. I've learned to do OG readings with refractometer, but I get ...
3
votes
1answer
169 views

Measuring alcohol when using ginger bug

I have recently started to get my feet wet by making some ginger beers using a ginger bug to start the fermentation. I would like to know the alcohol content of my final product, but as the ginger ...
2
votes
2answers
137 views

ceteris paribus, does mashing at a higher temperature lead to a higher final gravity?

I'm doing 6 lagers according to the Brulosophy Quick Lager method, where the temperature is raised to 65*F/18.3*C for the remainder of fermentation after attenuation has hit 50%. 2 of them have been ...
2
votes
3answers
1k views

What can I learn from fruit beer gravity?

I just bottled a batch of a watermelon beer where the gravities going into and out of primary matched the predictions (OG 1.050, FG 1.012). I added watermelon chunks in secondary and when it finished ...
2
votes
3answers
2k views

Variable Final Gravity when Priming for Bottle Conditioning

I was bottling a batch of beer last night and as always I take the last bit from the bottling bucket to test the Final gravity. When I tested it it read 1.044. After much talking amoungst ourselfs we ...
2
votes
2answers
90 views

What's going on with these gravities?

I'm a new home brewer. Since Christmas I've brewed 5 beers, all of which have been drinkable. The first I didn't have a hydrometer, the second I accidentally put in twice as much carapils as I was ...
2
votes
4answers
138 views

Is taking the gravity reading of a commercial beer useful when trying to clone?

I'm going to attempt a clone of a commercial beer. I already know the hops used and base malt. Obviously I know the ABV too. My question is if I take a gravity reading of the beer from the bottle ...
2
votes
1answer
69 views

FG not achieved after two weeks.

I have brewed a stout intended to be around 6%. After two weeks the FG is 1.024 but expected to be closer to 1.010. I found when I made the yeast starter (Giga Yeast 011) the yeast clumped and ...
2
votes
1answer
148 views

Fermentation time for APA with 1.080 OG

I brewed my first batch (APA) and while boiling I lost way too much water which resulted in higher OG. Expected was 1.050 but I got 1.080. I added Safale US-05 (1 pack) and left it to ferment at 20°C (...
2
votes
1answer
43 views

Chocolate stout stuck at 1021

I'm brewing a bulldog chocolate stout 'Easter brew' as per the instructions. 4.2kg of malt extract alone, 23L, one packet of dried yeast. OG 1058, the generic bulldog instructions just say get it to ...
2
votes
1answer
133 views

cider stopped at 1.016! Is this ok?

So this is just my second year of home brewing cider from the apples in my property. Last year I had 16L and everything went as it should. Thus year though with a bumper crop I've ended up with 87L in ...
2
votes
1answer
785 views

Will Adding Chocolate Affect the Final Gravity?

I am currently about 2 weeks into the primary fermentation a black stout to which I added 8oz of unsweetened cacao powder during the boil. The gravity seems to be stuck at 1.022 rather than the 1.014-...
1
vote
1answer
67 views

How much do melanoidins increase gravity?

I recently made an all-grain Russian Imperial Stout on a stovetop, and because of some volume miscalculations (or something), I boiled for 135 minutes to get down to my desired volume of 2.5 gallons. ...
1
vote
2answers
2k views

SG and OG quite different to values indicated on can label

very quick question: making a kit brew (Coopers Real Ale), which says a typical OG is 1.046 and FG is 1.006. Unfortunately, my OG was 1.038, and my current reading (after about 17 days) is 1.013, and ...
1
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2answers
2k views

Is it bad to let air into my primary fermenter?

My beer has been in the primary for about 5 days now. I can only assume fermentation has stopped as its reached peak krauzen and the froth seems to be subsiding. I attempted to seal up my primary as ...
1
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2answers
155 views

High F.G. Pros and cons of fixes

I think I know why my F.G. is so high, but I would like to know what are my options to try and fix it and what are the pros and cons of each. Below is my recipe and readings during mash. the ...
1
vote
2answers
3k views

Specific Gravities for Kombucha

The most-recent episode of Basic Brewing Radio has got me thinking about making Kombucha. What would be a typical OG (original gravity) and FG (final gravity) for a Kombucha?
1
vote
2answers
699 views

High FG in primary fermentation

I am doing a Diabolo beer from this kit First, my OG was 1.070 (vs 1.075 recommended). Now, after 9 days (they recommend 10 days in primary fermentation), the FG is 1.018. The recommend value is 1....
1
vote
1answer
592 views

Is this final gravity too high?

I brewed a Chocolate Oatmeal Milk Stout with an OG of 1.062. After 2.5 weeks of what seemed like active fermentation, it's only at 1.030. It's been at that for a week. It tastes like a it will be a ...
1
vote
1answer
1k views

Why does gravity increase between pre-boil and pitching?

My handy-dandy "Beer Craft" book has a handful of recipes with useful information, including expected targeted pre-boil gravity, original gravity, and final gravity. Their pale ale recipe, for ...
1
vote
1answer
62 views

Higher starting gravity

Is it true to get a higher S.G. you can by add extra Suger and fermentables like extra suger DME. I 'm trying to find a way to raise, The S.G and F.G to get a higher ABV.
1
vote
1answer
35 views

Low attenuation beer good enough for bottling

I recently brewed a new 5 gallon batch of hefeweizen. Measured OG was 1.054, I then racked to secondary fermentation after a couple of weeks, the last week of that had had no visible yeast activity. ...
1
vote
1answer
102 views

Final gravity too high

I have an IPA that I've brewed in five gallon batches before. OG at 1.065 and FG at 1.010. Those were hydrometer readings. I scaled it down for a one gallon batch, and pitched half a packet of yeast (...