Specific gravity in brewing is the ratio of the density of the wort to that of water.

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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 ...
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158 views

What exactly should I measure while brewing?

I want the answers to be geared towards meads/wines if possible. There seems to be so many things to measure. Which are the ones that really matter? I've started spending a lot of time taking all ...
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Water PH level and the effect on original gravity

What effect, if any, does the pH level of my water have on OG?
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what could be going on? 1065 to 1010 in 3 days and a half

This is just my first batch so I'm a complete newbie. I'm brewing a dry euro brown ale (grain + multiextract) and the temperature is between 57-67 f, but my bucket doesn't have a thermometer but I ...
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1answer
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Followed a recipe, made some changes, got same OG. Think it will taste similar?

I'm working on a recipe that called for some small amounts of LME (.75 lb Wheat LME, .5 lb Munich LME). I couldn't get such small amounts of LME at the homebrew store, so on some advice from the ...
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Measuring the ABV of non beer/wine products

I sometimes make alcoholic ginger beer and alcoholic lemonade. How would one estimate the abv of something like that? Is it even possible?
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Can I measure specific gravity a day after sampling?

Often when I pour a sample to be measured, there is a good 1cm of head obscuring the SG value. It can stay around for quite some time. Can I leave it overnight in order to take the reading the next ...
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Temperature correction for specific gravity

If I want to convert my specific gravity reading from one temperature to an equivalent specific gravity at 60F how do I do it? Can you give me a correction factor for this case?
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Degrees Plato vs Specific Gravity

What is the difference between these measurements and is one better than the other for any particular use? Which measurement scale do you use, why?
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Does wood affect final gravity readings?

For beer aged either in oak barrels or on oak chips/cubes, does the contact with the oak noticeably affect final gravity, and if so, what is the direct cause?
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412 views

Final Gravity A Little Off

I am at day 12 of my first brew from a True Brew Belgian Ale. I checked the gravity at day 6 (the kit said I could be ready to bottle after 7 days even though everyone says let it go for a few ...
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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 ...
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Final Gravity on the Refractormeter vs. the Hydrometer

I've been brewing the same recipe now for several batches. It's my house beer. A Kolsch-style beer. While I have followed the same recipe for each attempt, I'm sure there has been some variances in ...
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Refractometer - what exactly can it measure?

I am using a refractometer to determine gravities. I am aware of course that values measured need to be corrected depending on OG of the fermenting batch. What I don't know is, what kind of sugars am ...
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373 views

Determining the potential gravity of non-grain additions

How do you determine the potential gravity of certain ingredients? I'm sure there are charts and the like online, but, let's say you want to use a new fruit in a beer.. What are the steps to ...
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Calculating sugar in fresh fruit

Recently I made a belgian strong ale. In the secondary I added 7 pounds of fresh cherries that were pitted, frozen, thawed, and blended up. Is there a good way to at least estimate the additional ...
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1answer
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What gravity is suitable for not using priming sugar?

Assuming full attenuation, is there a way to figure out what gravity reading would be suitable to not use priming sugar, and just allow the excess sugar to create the carbonation? A sub-question would ...
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896 views

Measuring Gravity

What is the usual procedure for measuring gravity? Is it typical to just take an original and final gravity measurement or should measurements be taken throughout? I've heard people talk about ...
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1answer
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[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 ...
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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 ...
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Fermentation Issues???

Fermentation Help I have need some thoughts on what I should do with this batch of beer. I am brewing a clone kit which is called Belgium Wit. The directions were a little off based on the equipment ...
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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 ...