This is something I’ve been meaning to do for a *long*
time, but kept finding excuses to put off. It uses the simplified cubic polynomial derived in Brand accutane over the net. Please visit that post for more information. You can also download a spreadsheet
to track OG, FG, and more for multiple batches.

Did you know this calculator is used, on average, once every four minutes? If you find it useful please consider a Order usa acyclovir online to support its development and maintenance.

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Thanks for all the work with the Refractometer Calculator & putting a PHP version on your website. Very useful!

Jerry

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This is extremely helpful!! No more tedious math!! Thank you very much for putting this up!

Compared the last 5 brews I did with hydrometer and More beer refractometer program results. On all of them your OG specific gravity conversion from the brix reading was 2 (or so) sp gravity points lower than my hydrometer and the More beer values. These two were routinely within .5 sp gravity points. All the Fg calculations were spot on though!

Jack,

It sounds like the difference in OG you’re seeing could be due to the wort correction factor (1.04 by default). Are you applying a correction before using the MoreBeer sheet? If memory serves, it doesn’t have that capability.

At any rate, I’m glad it’s working out for you.

Sean

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Thanks for the calculator. Used it for my last two brews.

(while my hydrometer gently weeps)

Hi, thanks for the calculator. When a hydrometer sees me coming, it leaps screaming off the mantel to a glassy death.

I bought the refractometer two brews ago, and went through the old “how come it stopped fermenting?” when I took a reading I was expecting to be 1.010, but came out as 1.020. When the Internet told me how wrong I was to expect the device to make a reading in the presence of alcohol, I was already feeling guilty about the soon to be purchased and trashed hydrometer when I heard the show with James Spencer.

I don’t have a hydrometer :-) to check against, but the two low gravity beers I brewed in March seem to follow what I expected to get from OGs and observation when plugged into the calculator.

Hydrometers everywhere thank you,

Richard.

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Hi Sean, great work with all the calculations. How reliable do you feel this is?

I generally use a refractometer pre-boil and hydrometer post ferment as I haven’t felt I could trust the refractometers for measurements where alcohol was involved.

I was using your spreadsheet and keep track of my last 5 batches or so.

I currently have a Saison fermenting pre-boil was 15.2 brix, I measured the other day and I had 6.1brix, I also tested with my hydrometer and got 1.016sg.

Plugging the brix numbers in your calculator gives me a 1.008sg and approx 6.5% abv which is right where i want it. Putting the same numbers plus the hydrometer measurement in the spreadsheet gives me an abv of 5.5%.

Any theories?

Phillip,

The standard deviation for the 68 beers tested was 1.3 “points”. So if we make the assumption that those beers were a representative sample, then we can expect essentially all (99.7%) FGs to fall within 4 points of the predicted value. In reality, Brand accutane over the net, but that’s close enough.

So being 8 points off is highly unlikely. Have you calibrated the hydrometer and refractometer recently?

It could be that using a saison strain results in a large proportion of higher alcohols, or some other compound(s) that is/are throwing off the refractive index. If the correlation has given you good results when using other strains, I’d lean more towards that explanation.

Sorry I don’t have a definitive answer for you.

Sean

Hi Sean thanks for the reply, I went back and did a single point calibration of my hydrometer and my refractometer using distilled water at approx 68F. My refractometer was reading 0 which was good news however my hydrometer was reading between 3-4 points on the high side. This brings my readings inline with your calculations.

One more question, I put my OG in your calculator as 15.19 brix all the charts I’ve seen have this value in SG as 1.062, your calculator has it as 1.0594, where does that difference come from. I use the fermsoft grav brix chart for conversions mostly. http://www.fermsoft.com/gravbrix.php

Thanks again

Phillip.

Phillip,

Aha! This one’s easy. 15.2°Bx is in fact 1.062 SG, and if you were converting hydrometer readings it would be just that simple. Remember, though, that a refractometer doesn’t actually measure density – it measures the refractive index. That’s why a correction factor (1.04 by default) needs to be applied when using a refractometer with beer wort.

Sean

I’ve used your spread sheet for several batches. Currently I’m monitoring an open fermentation of a Russian Imperial Stout. OG was 25.3 Br, converting to ~1.103. I’m about 48 hours into fermentation and took a refractometer measurement for fun. It’s about 19 Br (fuzzy with yeast I’m sure, but the best fit for what I see). Entering that into your calculator and the spread sheet, the new cubic calculates 1.125 and the new linear calculates 1.043. Obviously the cubic is having a problem with this data (the 2 equations get close to each other in the 13-14 Br range), but how close is the linear calculation. It’s not that important right now, but it is interesting.

At this point, I wouldn’t assume that either correlation is giving good results. They won’t work below about 60% ADF, and you’re at the high end of the OG range as well.

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can I put in gravity number instead of brix? – sorry kind of new to this….

thanks for the assistance.

The reason there isn’t an option to work in SG is because (as far as I know) there are no refractometers on the market with an accurate SG scale. If you want to do an approximate conversion, °Bx = 250 * (SG – 1). That will be significantly off for gravities over about 1.070, though. Here’s a lookup table using a better formula.

In the comment above you mention that there isn’t an option to work in SG because there are no refractometers on the market with an accurate SG scale…are you referring to the fact that most SG scales on refractometers are simply the brix reading multiplied by 4? The makers of this refractometer (http://www.ebay.com/itm/0-32-Brix-Wort-Beer-Refractometer-BREWfractometer-/370539814932) make a big deal about the fact that they’ve ‘corrected’ the SG scale so that it’s not simply the Brix scale multiplied by four. Would this be an accurate SG scale in your view?

Also, I noticed that if I change the “wort correction factor” in the box above and click calculate, the gravity numbers that it shows are correct, but the number in the “wort correction factor” box defaults back to 1.04…not a big deal, but a bit confusing when I was first doing the calculations. Anyway, great job on the calculator…thanks a lot.

I’m optimistic, but if the image in the eBay listing is representative, that model doesn’t appear to be any different from the others I’ve seen. If you look at 20°Bx, for example, that should correspond to 1.083 SG, but it appears to line up with ~1.077.

The behavior of the wort correction factor field is something that I also find frustrating. As far as I can figure out, there’s no way to populate it with a default value on the initial pageload without having it revert to the default on reloading. I’ll play around with it a bit more though, now that you’ve reminded me. Thanks.

Edit: Actually, the solution turned out to be fairly simple, and the WCF field should now have the behavior we both wanted. Thanks again for the reminder.

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