How To Read My Hydrometer

Question:

How do you tell on a hydrometer when your beer is done? I brewed up a kolsch and my hydrometer says 1.010 right now.

Is that right or am I doing something wrong? I usually never check with hydrometer as I go off the airlock when it quits bubbling.

Can you let me know if I’m ready to bottle?

Answer:

The more you brew, the more experience you’ll gain understanding fermenting and garvity when brewing. There is a lot of info about this that you can read, but none of it comes close to what you gain by just brewing a beer.

You can guage your yeast’s completion of fermentation in part from apparent attenuation. There is usually a percentage of attenuation available for yeasts, especially the liquid varieties. It is usually 70 to 75% attenuation.

What’s this figure mean? The formula for figuring attenuation is:

OG-FG/OG

So, if your starting gravity is 1.050 and your finishing is 1.010, it becomes:

50-10/50=80%

At that point, you know your yeast is as done as it’s gonna get…