ABV Calculator
Calculate alcohol by volume (ABV) from gravity readings, or estimate Blood Alcohol Concentration (BAC) and sobriety timelines.
ABV mode helps brewers compare original gravity, final gravity, apparent attenuation, and estimated alcohol by volume. BAC remains available in the second workflow.
Safety disclaimer: BAC uses a simplified Widmark estimate with 14g standard drinks and a 0.015% per-hour elimination assumption. It cannot determine legal impairment, driving safety, or medical risk.
Alcohol Assessment Profile
Frequently Asked Questions
What is a standard drink?
In the United States, a standard drink contains about 14 grams of pure alcohol. This is roughly equivalent to 12 ounces of 5% beer, 5 ounces of 12% wine, or 1.5 ounces of 40% spirits.
How does the body eliminate alcohol?
The liver metabolizes about 90% of consumed alcohol, with the rest excreted through breath, sweat, and urine. The average elimination rate is approximately 0.015% BAC per hour.
What is attenuation in brewing?
Apparent attenuation represents the percentage of sugars converted into alcohol and carbon dioxide by yeast during fermentation. Higher attenuation yields a drier finish.