Why Gravity Readings Matter

Measuring specific gravity before and after fermentation reveals sugar-to-alcohol conversion. Accurate readings help predict alcohol content and determine fermentation completion.

Step-by-Step Guide

Sanitize your hydrometer and test jar
Take OG reading before pitching yeast
Ferment for recommended time
Take FG reading after fermentation stops
Use both values in the ABV formula

Common Gravity Reference

Beer Style	Typical OG	Typical FG
Light Lager	1.038 - 1.050	1.006 - 1.012
IPA	1.056 - 1.070	1.008 - 1.014
Imperial Stout	1.075 - 1.115	1.018 - 1.030

Pro Tips

Always temperature-correct your readings
Take multiple readings to confirm fermentation completion
Sanitize everything that touches your beer post-boil

Brewing FAQ

How accurate are hydrometers?

Hydrometers are generally accurate within ±0.002 when used correctly. Always check calibration in distilled water at the recommended temperature.

Can I use this calculator for wine?

Yes! The ABV formula works for any fermented beverage. Note that wines typically have higher OG readings (1.090-1.120) and longer fermentation times.

What if my gravity is too high after fermentation?

Stalled fermentation may require yeast nutrients, temperature adjustment, or yeast rousing. Always check your yeast's alcohol tolerance.

Homebrew Calculator

ABV Calculator

Result:

Unit Converter

Converted:

Menu

Homebrew Calculator (Brewing calculator)

AI Assistant

Was this tool helpful?