# I didn't know I had to take a reading before fermentation. I crushed my own fruit so no kit to use for calculation

This is my first time brewing and I didn't know that I had to take an initial reading prior to fermentation. I used my own apples to make cider. Can I still get an estimate on alcohol content? I think it's about done fermenting as it's been in the bucket for a little over a week.

I took a reading and have 1.35 specific gravity, 4% potential alcohol, 8% sugar (Balling) on my hydrometer. Bucket reads 68%. The brew smells yeasty, but I did not taste.

• 8 blg would sound about right for clear apple juice. Not for fermented one. Oct 26 '16 at 8:12

There is some rather complex math that can calculate an OG, but requires a hydrometer and a refractometer reading post fermentation.

Brewzor Calculator (android app) and Beersmith have these formulas.

But in your case you could estimate using an OG of 1.040 which is typical for Apple juice.

Might be a duplicate here: How to calculate alcohol without OG reading?

It appears that there is a formula using your Specific Gravity from a hydrometer and if you pick up a refractometer, a measurement from that, that you can use to calculate the ABV. Jump to section "Measurement of ABV" at Brew Your Own for the formula.

From the article:

ABV = [277.8851 - 277.4(SG) + 0.9956(Brix) + 0.00523(Brix2) + 0.000013(Brix3)] x (SG/0.79)