OG <--> ABV observation

[sallad]

it just sort of dawned on me that you can come up with a good approximation of your ABV based on the OG. assuming an apparent attenuation of about 73-75% (which is fairly typical, maybe a little high for some yeasts), you can take just the decimal portion of the OG, and divide by 10 to get ABV.

e.g.:
OG = 1.055 (decimal portion is 55)
55 / 10 = 5.5% ABV

i have a degree in math, i'm suprised it took me this long to notice this....

[ray m]

Not trying to bust you in the chops, sallad....the way I've read to do it in a couple publications (the names escape me) is to subtract the last 2 numbers of the FG from the last 2 numbers of the OG, and multiply that result by .1275. Just for shits & giggles, I'll have to try your way, though---it may be pretty close.

[YamahaXS]

or you can do what i do and just tell people the abv is somewhere between 3 and 7 %

[ray m]

lol:p