vera

Recipes 

I understand that you can't use a refractometer on fermented wort. Is there a formula that will compensate for the alcohol?

Haputanlas

Recipes 

If you don't know the OG, you won't know the alcohol. However, I assume it would be possible to figure out the OG if you had the FG and the ABV.

__________________
"There is no strong beer, only weak men"
"Pretty women make us BUY beer, ugly women make us DRINK beer" - Al Bundy
"Give a man a beer, he'll drink for a day. Teach a man to brew, he'll be drunk for the rest of his life."

Primary: Hoppy Wheat, Porter
Kegged: Reaper's English Mild (OO), BBK Jr., Lagunitas IPA, Fireman's #4
Bottled: None
Notable Empties: Oaked Black IIPA, BBK I, Red IIPA, Burning Bush, Apophis "The Destroyer", Vanilla Porter
On-Deck: The Titan BW, Ale of Olympus

tv187u

Recipes 

There is a formula thAt allows you to measure fermenting wort. I however don't know it since I use 'beer smith' which has a function for that. I have heard that it isn't very accurate, though. I always use a hydro once yeast has been pitched.

Vale

Recipes 

The formula is:

Current Gravity = 1.53 X Current_Refractometer_Reading - 0.59 X Original_Gravity

OG will have to be expressed in degrees Brix (or Plato, whatever unit your refractometer uses) too!

Cheers,

Vale

petrostar

Recipes 

Just google refractometer calculator. I've used my refractometer for a year now. It is very accurate and allows for constant testing of the beer with minimal risk. I pulled hydro samples the first 6-7 batches to verify its accuracy. Make sure you account for temperature on both OG and FG, it makes a difference.

kh54s10

Recipes 

I ahve used a couple of calculators that I found by googling. They gave ma an idea of what the gravity was post fermentation but I didn't find them to be terribly accurate.

Spartan1979

Recipes 

I've found the calculators to be fairly accurate, usually within a couple of points. I just use mine to give me an idea of where I'm at. I take the "official" FG reading with a hydrometer.

hough77

Recipes 

The app "Brew Pal" has the alcohol correction for refractometer's and hydrometer corrections, amongst other goodies! I use an iPhone, don't know about Android or Blackberry.

RoadKing

Recipes 

I use this spreadsheet from Morebeer http://morebeer.com/learn_vids/vids_refract
The link to Download in under video. I know alot of people say it's not accurate with alcohol present, but when I double check it against hydrometer its allways correct.

__________________
DIRTY GARAGE BREWING CO.