Beer Alcohol Content Calculator

ABV Formula:

\[ ABV = (OG - FG) \times 131.25 \]

ABV (Alcohol By Volume):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is ABV Calculation?

ABV (Alcohol By Volume) calculation estimates the alcohol content in beer based on the difference between original gravity (OG) and final gravity (FG). This simple formula provides brewers with an accurate measurement of their beer's alcohol percentage.

2. How Does the Calculator Work?

The calculator uses the ABV formula:

\[ ABV = (OG - FG) \times 131.25 \]

Where:

\( OG \) — Original Gravity (specific gravity before fermentation)
\( FG \) — Final Gravity (specific gravity after fermentation)
\( 131.25 \) — Conversion factor to percentage

Explanation: The formula calculates alcohol content by measuring the density change during fermentation, where sugars are converted to alcohol and CO₂.

3. Importance of ABV Calculation

Details: Accurate ABV calculation is essential for brewers to control beer strength, ensure consistency between batches, comply with labeling regulations, and understand fermentation efficiency.

4. Using the Calculator

Tips: Enter original gravity and final gravity as specific gravity values (e.g., 1.050, 1.010). OG must be higher than FG for valid calculation. Use a hydrometer for accurate gravity measurements.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for OG and FG?
A: OG typically ranges from 1.030 (light beers) to 1.090 (strong beers), while FG ranges from 1.005 (dry beers) to 1.020 (sweet beers).

Q2: Why is the conversion factor 131.25?
A: This factor is derived from the density difference between ethanol and water, providing a reliable conversion from gravity points to alcohol percentage.

Q3: How accurate is this calculation?
A: This method provides a good estimate (±0.5%) for most brewing applications, though more precise methods exist for commercial requirements.

Q4: Can I use this for other alcoholic beverages?
A: While primarily designed for beer, the formula can provide rough estimates for other fermented beverages, though specific gravity ranges may differ.

Q5: What affects fermentation efficiency?
A: Yeast health, fermentation temperature, wort composition, oxygen levels, and pitching rates all impact how completely sugars are converted to alcohol.