Questions tagged [original-gravity]

Initial gravity of wort (prior to fermentation).

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19
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1answer
16k views

[WIKI] How Do You Calculate Original Gravity?

This is a community wiki post. Anybody with more than 100 reputation can edit it. You may also post your own answer. I get no reputation if you vote the question up or down, however, please vote up if ...
18
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3answers
12k views

How Does a Hydrometer Work?

I know how to use my hydrometer, and I know what numbers to look at and write down on my brewing sheets, but I'm not sure what those numbers actually represent, or even what units I should use to ...
14
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1answer
1k views

Original Gravity: Calculate or measure

I've been told that for extract brewing it's best to simply calculate the original gravity instead of measuring it. Is this correct? What are the pros/cons either way? What about with extract+...
13
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4answers
18k views

Didn't hit gravity--how to calculate how much malt extract to add to the fermenter?

Lets say you were aiming for 1.047 but only hit 1.032. In a 5 gallon batch, how much malt extract would you need to add to the fermenter to bring it up to the desired gravity?
11
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3answers
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Diluting beer after 11 hours of fermentation. What to expect?

Ended up with too high gravity wort. Since I was not prepared for this I didn't have enough sterile water to dilute the wort. I ended up pitching the yeast anyway and adding sterile water at 11 hours ...
8
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2answers
39k views

How to calculate alcohol without OG reading?

I tested 'brewing' a cider for the first time a few weeks ago. Since this process was so extremely different from what I am used to with brewing beers I completely forgot to take an OG reading. To be ...
7
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7answers
23k views

Why is my starting gravity low?

In the fall of 2011 I made the leap from extract/partial kits to all-grain kits. I'm enjoying AG, but my SG is continuously below the expected. I have brewed 5 AG kits and 4 have had a low SG. My ...
7
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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
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3answers
3k views

Why was original gravity high by .010?

Recently brewed a dry stout extract kit. Boiled 5 gallons on propane. Steeped 2 lbs of roasted malt, crystal malt and flaked barley at 155-160 F. Extract was 6.6lbs of Coopers Light LME. As usual, ...
6
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2answers
480 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
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4answers
3k views

How do you calculate how much extract to add if you don't hit your target gravity pre-boil?

Planning to do my first all-grain BIAB. If miss my target gravity after mashing, how do I figure out how much extract to add before I start the boil in order to reach that OG? I would imagine pre-...
6
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1answer
943 views

Curiously high OG after first all-grain batch

I conquered my first all-grain batch this weekend, and after some early problems constructing my cooler mash tun, it went off without a hitch. It's a Northern Brewer all grain kit, and the recipe ...
6
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2answers
6k views

Why would OG be significantly higher than predicted?

I know there are several questions on the forum about OG being lower than predicted. Please bear with me though. I'm at a loss. I just brewed a straightforward extract wheat beer recipe. The ...
6
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2answers
149 views

ABV from one SG?

The most common way to calculate ABV (Alcohol By Volume) is through some correlation between Original Gravity (OG) and Final Gravity(FG). Is there any way to calculate ABV just from the current ...
5
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2answers
197 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
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2answers
96 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
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3answers
6k views

Why is our Original Gravity low?

When brewing from an extract kit we always seem to be low in the Original Gravity department. It's usually not a lot -- something like 1.055 instead of 1.060. What might be causing this to happen? Is ...
5
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1answer
568 views

Does white honey have greater effect on gravity?

A few weeks ago I made my first mead (actually a braggot). I ordered a 12 lb bucket of raw honey. To my surprise, when I opened it the honey inside was a creamy, almost foamy opaque white. It didn't ...
5
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3answers
3k views

is it possible to estimate OG from nutritional information?

After many batches of beer, I've decided to try a hard cider. The recipe I have does not give a predicted OG, however all of the ingredients list the amount of sugar in the nutritional information. ...
5
votes
1answer
457 views

How might trub effect taking original gravity?

For the beer that I brewed this past weekend, I finally remembered to take an Original Gravity reading. Unlike my previous last three attempts, I actually had a little more than my target 1 gallon, ...
5
votes
1answer
412 views

How can I prime by taking the gravity of the priming fluid?

I have this great mulberry syrup I found. I want to prime with it, and I forget how to figure this out with an unknown sugar source. I see that John Palmer's "How to Brew" references measuring the ...
5
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2answers
1k views

Using Burnt Caramel / Brewer's Caramel in Recipes

Has anyone worked with using either burnt caramel or brewer's caramel in their recipes? I have read a few places that Fuller's is known to use this to increase the SRM of some of their product line, ...
5
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3answers
3k 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
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4answers
3k views

How does a yeast starter affect original gravity reading?

I've prepared a 1qt (~1L) yeast starter according to instructions from Wyeast.com. I didn't measure its gravity, but in theory it should be about 1.040. I am brewing a 5 gallon batch of high gravity ...
4
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3answers
21k views

When to add DME if you miss your starting OG?

My family was very nice to me this Christmas and I got a bayou classic burner and an 32qt. pot with 2 ports and a bazooka screen as well as an immersion chiller. I had built a 10 gallon mash tun over ...
4
votes
2answers
832 views

Undershooting OG in all-grain brewing

My last few all-grain batches have been under the expected OG at least as far as the recipe is concerned. The beers still taste good and all, but I'd like to get my efficiency up. For example, my ...
4
votes
3answers
390 views

How to measure starting gravity without a hydrometer

How would one go about calculating starting gravity without a hydrometer? I know that there is a way to mathematically determine this, which is what I'm looking for.
4
votes
2answers
328 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
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2answers
774 views

Does a malt "late addition" affect OG?

I'm following a recipe from a book for an IPA that calls for the following (simplified) steps: Boil water (3G/11L) Add Light DME (1lb/450g) & return to boil Add hops At 45 mins, add LME (6.6lb/...
4
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2answers
7k views

Stuck or Slow Fermentation

So I have my first possible stuck fermentation. First, my recipe: http://hopville.com/recipe/166971/extra-special-strong-bitter-english-pale-ale-recipes/shoals-pale-ale-clone I pitched with two ...
4
votes
1answer
12k views

What happens when mash temperature is too low?

So yesterday we brew our second beer. As expected, some errors occured during the process, which is alright, we're learning! :) So the main problem is that we were only able to keep the mash ...
4
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1answer
6k views

How can I fix low starting gravity?

I made my third all-grain batch last weekend. I have had issues getting decent efficiency so I added a couple extra pounds of ESB malted barley (11lbs, instead of 9, and about 3lbs of specialty grain)....
4
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1answer
3k views

Why is my OG so low?

I brewed this recipe but substituted crystal 80 for the crystal 15. I did the full mash option, and I doubled all the ingredients and did a 10 gallon batch. I got an OG of 1.045 at 75F so adjusted ...
4
votes
2answers
16k views

What to do when gravity comes out too low?

We brewed a maibock (from an extract kit) and when we checked our OG it was significantly lower than it should have been. I mean like, really, really low. We decided to attribute this to the wort not ...
4
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2answers
246 views

What effect would using less LME than called for have?

I just brewed a recipe for a biggish beer that calls for 6.6 lbs of light LME and 2.75 lbs of light DME. Given that I always mess up at least one thing when I brew, I measured out 2.75 lbs of DME and ...
4
votes
3answers
241 views

Raising OG before pitching yeast

I am using an all-grain recipe for a Belgian ale. My OG came out to 1.052 rather than 1.081-5. What can I do to raise the OG before pitching the yeast? Will a pound or two of malt extract help?
4
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4answers
4k views

Lots of trub affecting specific gravity readings?

I'm in the process of making a pretty big pumpkin beer, and just transferred to secondary. There was an incredible amount of trub -- probably 1.5 gallons out of a 5 gallon batch. I guess it was a ...
3
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2answers
3k views

Ensuring an accurate gravity reading

So I've brewed between 6-10 batches of beer at home using partial boil methods but have never managed to get accurate gravity readings. The issue I have is that my readings somehow always seem to be ...
3
votes
3answers
2k views

Hydrometer reading interference

When brewing an IPA about a week ago, my starting gravity reading came out to be 1.12 - significantly higher than the listed target of 1.07 on the recipe. I had suspicions of error at the time which I ...
3
votes
1answer
400 views

How important is it to hit a recipe's target OG? What if my OG is too high?

I just brewed a chai tea brown ale (recipe here) -- which has a target OG of 1.048 -- and ended up with an OG of 1.064. My efficiency for this batch hit 78%, which I presume is higher than the recipe ...
3
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1answer
1k views

Convert US to metric gravity points

How can I convert US gravity points? If, for example, a pound per gallon of sugar gives 46 gravity points (1.046 OG), how can I calcualate the corresponding value when 1kg of sugar is added to 10l of ...
3
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2answers
421 views

Can wort layering significantly affect OG reading?

A few days ago I brewed a 5-gallon recipe with the following fermentables: 8 oz Crystal 20 8 oz Crystal 40 One 3.3 lb can Briess Munich LME 2.5 lb Light LME Beer Calculus predicts an OG of 1.046. ...
3
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2answers
124 views

How to get higher gravity

I am using 60kg undermodified 6 row barley for 300 litres, I performed 60 minutes rest at 64°C and 30 minutes rest at 72°C, but I got 12°Plato original gravity (1.048) after boiling. Please help me ...
3
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1answer
78 views

Is delayed yeast activity normal?

I am working on a small batch, 1 gallon of Pale Ale. It came in a kit and the yeast was not labeled so I am not sure what kind it is. This is only the third batch I have brewed. On my first two ...
3
votes
3answers
408 views

Undershot OG with extract brewing

Today I attempted an American IPA (Extract) full boil. I calculated the OG to be around 1085 using beersmith. The recipe included just over 11lbs of fermentables (9.15lbs LME, 1.10lb DME, 1lb corn ...
3
votes
3answers
214 views

Different OG than predicted

Just brewed a batch, and my OG reading is significantly different (1.051 as opposed to 1.070) than what Beercalculus.com predicted based on my recipe. Is there any possible reason for this that ...
3
votes
1answer
474 views

How to calculate amount of water to add to lower OG to target

I have been using less water than needed in my partial mash recipes. For a target of 8 gal into 2 (5 gal) fermenters, I have been using 3 (+1 gal sparge) in the mash step and 2 gal for boiling ...
3
votes
1answer
620 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
146 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
1answer
671 views

Missed my target gravity and volume by a mile

So, I know there were lots of things I could have done to repair the situation had I been prepared (lesson learned, I'll be having DME on hand from here on out), but I'm a little more interested in ...