# Figure out FG ?

### Help Support Homebrew Talk:

#### karljrberno

##### Well-Known Member
Is there a way to determine what the FG Of you beer will be ?

I know there is factor all grain / extract any good reads on this how to determine

#### temptnmonkey

##### Well-Known Member
if your OG is 1.060
and your attenuation is 75%

turn the 1.060 into 60, and the % into .75 and you can simply do the following formula

60 - (60 * 0.75) = 15 (don't forget to add the 1.0). so, the est. FG is 1.015 (and give or take a couple points).

There are many other formulas (variations on the same thing) and free/paid software that will do it for you available as well.

#### Nateo

##### Well-Known Member
Attenuation for brewer's yeast generally ranges from 65-85%, and could be 60-90% if using lots of simple-sugar adjuncts or lots of unfermentables. That's a big range. For a "normal" beer, with an OG of 1.060, the range would be between 1.09-1.021, which is so large as to be practically useless.

To just pick 75% attenuation as your estimate is a sure way to be wrong almost all of the time.

If you have specs for the yeast strain you're using, it's a good start. For instance, the expected attenuation for WLP001 is 63-70%, so the beer in our example would finish between 1.018-1.022, which is a much more reasonable range, but is still a larger range than I feel comfortable trusting.

#### TopherM

##### Well-Known Member
Hydrometer. Also, most recipes include the expected FG.