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Home Brew Forums > Wine, Mead, Cider, Sake & Soda > Cider Forum > Trying to calculate grav in an overly-complicated cider making process.
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Old 11-16-2011, 10:27 PM   #1
DanMalleck
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Default Trying to calculate grav in an overly-complicated cider making process.

Okay, folks. It's my first time making cider (long time making beer). and I messed up but fixed it. However, I cannot calculate the gravity now because I was adding stuff, modifying and so on. Please help me figure out if my calculations are correct:

First, I made 3 gallons of cider by adding Camden tabs the day before, then heating to 190F for a bit (sterilization overkill?), then cooling and pitching a pack of Safale US-05

The gravity was 1.045 which my cider-loving friend said was too low--she wanted some strong cider.

So I added 1 lb of sugar (dissolved in some boiled water). I know, in retrospect: what a stupid thing (which I was told by a "soft" cider vendor).

When it had fermented down to a gravity of 0.098, I added another gallon of cider (1.045 grav). It fermented to about 1.003

Determining it to be still too solventy, I added about 2/3 Gallon of tart apple juice (unpasteurized) (grav: 1.048).

now, nearly a year later, the grav is an even 1.000

This is my calculation, based on gravity points of the ingredients to figure out what the OG would have been had I put all of this in at the beginning

Grav of the initial mixture: 1.045 of 3 Gallons
1lb sugar into 3 gallons = 1.045/3 gal = 15 points more.
another gallon at 1.045. Now this divided by 4 gallons = 11.25 pts.
the remaining 2/3 gallons of apple juice, at a grav of 1.048, goes into what is now 4.7 Gallons of cider. That's 1.048/4.7 let's just say an additional 10 points.

So, in total : 1.045+15+11+10 = 1.081 as what the starting grav would have been had I put this all together.

With a FG of 1.000, this means 81 X .131 = 10.6 ABV

Is this in any way an accurate estimate?

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Old 11-16-2011, 11:12 PM   #2
GinKings
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I'm sure you're used to using water in heat when you make beer. Neither is typically used in cidermaking.

You're math is a bit off. Look at it this way, you used 4 2/3 gallons of cider. The average gravity is around 1.045. To that you added 1 lb of sugar, which has 45 points of gravity. 45 divided by 4.67 gallons and it should've raised the gravity by about 10 points. 1.045 + 10 points from sugar = OG 1.055. Fermenting to 1.000 gives you approx 7.3% ABV.

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Old 11-17-2011, 02:28 PM   #3
DanMalleck
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Default That makes more sense

Thanks. There I go trying to complicate it. 7.3% makes more sense than 10.5 and explains why my friend could still walk after chugging the 8 oz I gave her to try.

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