Homebrew Beer ABV %, Apparent Attenuation & Calories per 12 oz Calculator

Compute ABV = (OG − FG) × 131.25 and yeast attenuation % from hydrometer readings.

Alcohol By Volume (ABV %)
5.78 % ABV
Apparent Yeast Attenuation 78.57 %
Original Gravity in Degrees Plato 13.8 °P
Gravity Points Fermented 44 pts
Inputs
SG
Pre-fermentation wort Original Gravity (OG, e.g., 1.056).
SG
Post-fermentation beer Final Gravity (FG, e.g., 1.012).
Results & Graph
Alcohol By Volume (ABV %)
5.78 % ABV
Apparent Yeast Attenuation
78.57 %
Original Gravity in Degrees Plato
13.8 °P
Gravity Points Fermented
44 pts

Alcohol By Volume (ABV %)

Graph 1 • Original Gravity Og Sensitivity Recalculates the domain equation across 50% to 150% of the primary input while holding other parameters constant.
-1.6 % ABV 39.8 % ABV 81.1 % ABV 50%: -1.58 % ABV -1.6 50% 75%: -1.58 % ABV -1.6 75% 100%: 5.78 % ABV 5.8 100% 125%: 40.43 % ABV 40.4 125% 150%: 75.08 % ABV 75.1 150%
Graph 2 • Primary & Supporting Metric Comparison Compares the primary output alongside supporting domain benchmarks.
Alcohol By Volume (ABV %) 5.78 % ABV Apparent Yeast Attenuation 78.57 % Original Gravity in Degrees Plato 13.8 °P Gravity Points Fermented 44 pts
Graph 3 • Exact Output Table & Units Displays each calculated output in its exact domain unit.
Alcohol By Volume (ABV %)5.78 % ABVApparent Yeast Attenuation78.57 %Original Gravity in Degrees Plato13.8 °PGravity Points Fermented44 pts
Summary: Fermenting from OG 1.056 (13.8 °P) down to FG 1.012 yields 5.78% ABV and 78.6% apparent yeast attenuation.
Summary: Fermenting from OG 1.056 (13.8 °P) down to FG 1.012 yields 5.78% ABV and 78.6% apparent yeast attenuation.
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Formula & Mathematical Methodology: Homebrew ABV & Gravity Formula

ABV% = (OG − FG) × 131.25
ApparentAttenuation% = [OG − FGOG − 1.000] × 100
ABV% = (OG − FG) × 131.25; ApparentAttenuation% = [(OG − FG) / (OG − 1.000)] × 100
  • originalGravityOg: Original Gravity Og (SG)
  • finalGravityFg: Final Gravity Fg (SG)

Rounding: Physical package counts round up where appropriate; continuous measurements round to 2 decimal places.

Worked Example: Practical Benchmark: Homebrew ABV & Gravity

Compute ABV = (OG − FG) × 131.25 and yeast attenuation % from hydrometer readings.

  1. Enter your project dimensions, machining speeds, or recipe weights.
  2. Compute the governing equation: ABV% = (OG − FG) × 131.25; ApparentAttenuation% = [(OG − FG) / (OG − 1.000)] × 100.
  3. Review the primary result, supporting dimensions, and 3 SVG visualizations.
Result: Computes Homebrew ABV & Gravity via ABV% = (OG − FG) × 131.25; ApparentAttenuation% = [(OG − FG) / (OG − 1.000)] × 100.

Frequently Asked Questions

How does the Homebrew Beer ABV %, Apparent Attenuation & Calories per 12 oz Calculator calculate results?

It evaluates ABV% = (OG − FG) × 131.25; ApparentAttenuation% = [(OG − FG) / (OG − 1.000)] × 100 directly in your browser and plots three custom SVG visualizations.

Can I compare different material dimensions or batch sizes side by side?

Yes. Click "Compare (0/3)" in the results toolbar to pin up to 3 scenarios side by side.

Can I print a clean shop or kitchen reference sheet?

Yes. Click the Print button in the results toolbar for a distraction-free worksheet.

Everyday Life · Kitchen & Culinary

Homebrew Beer ABV %, Apparent Attenuation & Calories per 12 oz Calculator: inputs, method, and how to read the result

Compute ABV = (OG − FG) × 131.25 and yeast attenuation % from hydrometer readings.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Original Gravity Og: Pre-fermentation wort Original Gravity (OG, e.g., 1.056).
  • Final Gravity Fg: Post-fermentation beer Final Gravity (FG, e.g., 1.012).

What the calculation includes

With the default values shown, Alcohol By Volume (ABV %) is 5.78 % ABV. The calculation follows Homebrew ABV & Gravity Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Original Gravity Og from 1.056 SG to 1.166 SG changes Alcohol By Volume (ABV %) from 5.78 % ABV to 20.21 % ABV. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses standard North American & metric trade dimensions, Machinery’s Handbook formulas, and culinary weight ratios.
  • Verify local municipal building codes, tool manufacturer limits, and food-safety time/temperature tables before execution.

Scope: Trade, Shop & Culinary Science Reference Standard Check the assumptions and limitations against your situation before relying on the estimate.

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