Beer Brewing ABV Calculator

Calculate alcohol content (ABV) from original and final gravity of homebrew.

By Konstantin Iakovlev · Updated April 2026 · Source: USDA

gallons

ABV

5.3%

Bottles (12oz)

53

Brew Stats

ABV5.3%
Calories (per 12oz)~1318 cal
Apparent Attenuation80.0%
12oz Bottles53
FormulaABV = (OG−FG) × 131.25

Use the Beer Brewing ABV Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Alcohol by volume tells a homebrewer how potent a finished beer turned out, and it shapes everything from recipe design to quality control. Pinning the number down lets you confirm a batch hit its target, compare it against the style you were aiming for, and steer your 2026 brewing projects with confidence rather than guesswork.

The estimate rests on the gap between two gravity readings: original gravity (OG) before fermentation and final gravity (FG) after. The widely used formula ABV = (OG - FG) * 131.25 turns that difference into an alcohol figure, with both readings taken on a hydrometer. It gives a dependable read on how much sugar the yeast converted.

Temperature is where accuracy lives or dies, so take every gravity reading at the same temperature; drift there skews the hydrometer. Pull the final reading too early, before fermentation has truly finished, and you'll undershoot the real ABV. Treat the output as a solid estimate, not a lab measurement, since pinpoint accuracy calls for laboratory analysis.

Example: Calculating ABV for a 2026 Pale Ale Batch

  1. 1 You've brewed a delicious pale ale in late 2025, and after primary fermentation, your Original Gravity (OG) reading was 1.055. After two weeks of fermentation and a stable reading, your Final Gravity (FG) is 1.012.
  2. 2 Using the formula: ABV = (OG - FG) * 131.25. So, ABV = (1.055 - 1.012) * 131.25 = 0.043 * 131.25 = 5.63375.
  3. 3 Your 2026 Pale Ale has an estimated Alcohol By Volume (ABV) of 5.63%.
  4. 4 This 5.63% ABV is a typical strength for a pale ale, aligning with many commercial examples. Knowing this allows you to confidently label your brew, adjust future recipes for desired strength, and understand the impact of your fermentation process.

Source: USDA · Last updated: April 2026

Frequently Asked Questions

How do I calculate ABV for homebrew?
Subtract the final gravity (FG) from the original gravity (OG) and multiply by 131.25. For example, an OG of 1.050 and FG of 1.010 gives (0.050 - 0.010) x 131.25 = 5.25% ABV.
What is original gravity in brewing?
Original gravity (OG) measures the sugar content of your wort before fermentation. It is measured with a hydrometer or refractometer. A typical OG ranges from 1.030 for a light session beer to 1.090+ for imperial stouts.
Why is my homebrew ABV lower than expected?
A high final gravity (incomplete fermentation) is the most common cause. This can result from underpitching yeast, fermenting too cold, or poor yeast health. Check that fermentation temperature and yeast pitch rate are correct.

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