# Questions tagged [calculations]

Any sort of numerical manipulations used in calculating brew-related quantities such as bitterness, original gravity etc.

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27 views

### Check My Degrees Plato Calculations

I'm putting together my own brewing calculations spreadsheet to develop a good understanding of the ins and outs of building a beer recipe. For my malt/mash calculations, I've chosen to use the ...
70 views

### How will I calculate ABV if I had to add honey in the middle of a stuck fermentation?

I created a lemon/ginger/carrot mead and started with SG 1.120. I used a mead calculator (https://gotmead.com/blog/the-mead-calculator/) to factor in the sugars in the carrot. However, the ...
6k views

### Why less priming sugar in a mini keg?

I am used to bottling my beer and do bottle conditioning. However, I just bought a few 5l mini kegs for the next batch which is currently fermenting. From what I have read from different sources, you ...
1k views

### Plato degree to specific gravity conversion question

I have a question regarding the conversion from Plato degrees to specific gravity, and the widely used value of 46ppg for sugar dissolved in water. According to wikipedia, plato degrees are defined ...
2k 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 ...
1k views

### Measuring yeast in a slurry

Please tell me if I'm being overly simplistic here. I was reading the book yeast by Chris White and Jamil Zainasheff. In the book, they talk about measuring how many cells are in a slurry by using a ...
327 views

### Correct temperature effect on Specific gravity

Is there an equation that corrects specific gravity while considering temperature effect in Celsius, which does not presupposes a set hydrometer calibration temperature? A direct relation, not tables ...
86 views

### How to test mash for ion concentrations

I'm wondering if it's possible to test the mash during mash for an all grain batch to determine concentrations of calcium, magnesium, etc. Or if that is better determined by pre-mash calculations. ...
24k views

### 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?
2k views

### Determining beer quantity when FG and weight are known

In making the assumption that given the final gravity and physical weight of beer (or any liquid for that matter), that you can find the total quantity, what is the calculation necessary for ...
171 views

### What does a gravity reading really mean?

The simple/short version of the question: What does a hydrometer gravity reading of 1.036 really mean? Does it mean the density of the liquid is 3.6% greater than that of distilled water (ignoring ...
8k views

### Can we estimate the temperature rise in the primary due to fermentation?

OK, this is sort of cheating but I really liked this question so I thought I'd ask the question again in a slightly different way and try and answer it. I was wondering if we can actually estimate ...
104 views

### Correction of Tinseth's for pellets vs cones

As I understand Tinseth's formula is derived from curve fitting (as I read it from his article). However I can't see if he's using pellets or cones and I think that the utilization differs. I expect ...
217 views

### How would I estimate yeast concentration of washed yeast for Mr Malty's calculator?

I washed some yeast ( US 05 ) from my last brew; and I now have 3 jars of yeast which separated out nicely overnight. They're around 2/3 yeast, 1/3 liquid at the moment, with no trub as far as I can ...
265 views

### First brew: dry hopped mead, probably stuck. How to best proceed?

I'm on day 9 of my first attempt at home brewing (1 gallon batch), and based on my measurements on day 5 and today it appears to be stuck at 1.010 Original Gravity was 1.065 Kind of just went gung-...
114 views

### Question regarding which volume to use for OG calculation

My question is regarding which volume to use when calculating OG, and more importantly why. How to calculate the gravity points for a recipe is fine, but then according to BeerSmith at least, you ...
259 views

### Calculate preboil volume

I forgot to measure how much wort I had preboil. I did take a gravity reading preboil. Can I deduce preboil volume with post boil volume and pre & post boil gravity?
767 views

### Calculating boil volume in partial boil?

I'm an all-grain brewer but I haven't done an extract batch in years (or an all-grain one in over a year) and want to do an extract IPA this week. Looking at the various software and calculators, they ...
453 views

### Beer recipe calculations?

Does anyone know of a good place to get all the various formulas used to compute final gravity, color, bitterness, etc. in your beer?
787 views

### Is there open source web library for Calculating ABV or other brew related tasks

Is anyone aware of a good script or library free/Open Source that can be used on a web page to calculate ABV, I'm not looking for a sites that will do the calculation for you, I want to add the ...
14k views

### Calculating carbon dioxide production during fermentation

I know yeast ferments sugars into alcohol at a predictable rate, but is the same is true for carbon dioxide? Since I know the amount of sugars fermented though my gravity readings, shouldn't it be ...
3k views

### What are my options for brewing software?

I'm looking for brewing software that helps with record-keeping, calculations, inventory, and/or recipes. Across any platform (Windows/Mac OS X/Linux), what brewing software is available, and what ...
503 views

### Mash & Sparge Calculation

I'm planning on brewing a double batch of "OktoberFAST" this weekend. I've used a few online brewing calculators and they seem to be giving me the wrong answer. I've always read that if more then 50% ...
2k views

### How is ABV calculated if distilled spirits are added to beer?

How would one calculate the ABV of a beer if distilled spirits were added? For instance, when making a beer recipe that called for adding bourbon as a flavoring agent. If you started with, say, 5 US ...
1k views

### Calculating Potential ABV

I've seen some tables online like the ones at American Homebrewers Association and Brewhaus Canada that list Potential ABV for different values of Original Gravity. My intuition tells me that these ...
84 views

### Determining the amount of herbs to use

I am planning on brewing a herb beer; Rooibos Honey Ale. Question one is: How can I estimate (ball park) the amount of herbs to use prior to brewing the beer? Should I make a tea and then calculate ...
935 views

### Thermal expansion of wort

Does anybody know an algorithm or a calculator to compute thermal expansion of worts? Most of the time in homebrewing materials, it is said that in volume calculations one should account for 4% ...
258 views

### Brewing Formulas?

What formulas and calculations exist for the home brewer?
310 views

### Inconsistencies in fermentables' ppg calculation

I've been searching around the net, asking in forums, even writing to Weyermann, trying to figure out what is the correct formula -- using a malt spec sheet -- to calculate the ppg value that I can ...
324 views

### Why is it necessary to approximate starting and finishing gravity?

In the book "Home Beermaking", by William Moore, it talks about calculating starting and finishing gravity in chapter 6. I believe that he's talking about when I get good enough at homebrewing to make ...
256 views

### What factors go into calculating perceived sweetness/bitterness?

Some sites calculate bitterness vs sweetness on a scale of sorts, where one side is "malty sweet", and the other side is "hoppy bitter" (ex. hopville). My question is, to do a very basic calculation ...
1k views

### Can I derive Final Gravity from Original Gravity and ABV?

I think the answer is yes. Since we use OG and FG to determine ABV ... I would assume we could do the same with ABV and OG to determine FG, right?
855 views

### How does efficiency change when adding grains that are normally steeped to a mash?

Imagine this scenario: you have a an extract recipe that contains a pound of steeped caramel malt. According to http://www.promash.com/FAQ/faq_diff.html the average efficiency of steeped malts is ...
1k views

### Why does the temperature of bottle conditioning determine the amount of priming sugar?

When using CO2 calculators or the nomograph on Palmer's site we see that depending on the temperature of your beer, you use a different amount of priming sugar in order to get the same effective ...
148 views

### Is there a brewing software that supports late additions?

Promash doesn't support late addition of extracts (which affects hop extraction). Either that, or I can't find out how to do it. I sometimes use beercalculus.hopville.com to create two recipes, one ...
6k views

### Yeast Starter Steps

I want to make a yeast starter for a lager. I even went out and got a 3000 ml Erlenmyer Flask. According to mrmalty.com's calculator I need 506 Billion cells. With the two vials of White Labs yeast ...
523 views

### Quantifying the level of hoppiness in a beer

Does anyone know of some sort of measurement for the hoppiness of a beer? Late hop additions don't add much to the bitterness (IBUs) but they can add tons of hop flavor. Is there some way to ...
589 views

### Homebrew Calendar/Planning Software/Site?

Does anyone know of a solid application for pre-planning your homebrews? I have a really tight schedule, and determining when to start a batch can be a real hairball. There are lots of variables and ...
5k views

### What's the ideal size for a mash tun?

This question has been bothering me for a while and I looked it up using google. The only related search result was this thread http://www.homebrewtalk.com/f11/how-big-your-mash-tun-needs-123585/ ...