Homebrewing Alcohol By Volume (ABV), Apparent/Real Attenuation & Calories Calculator

Compute ABV %, Apparent Attenuation %, Plato equivalents, and calories from Original & Final Gravity.

Alcohol By Volume (ABV %)
5.93 % ABV
Standard Linear ABV ((OG−FG)×131.25) 5.78 % ABV
Apparent Yeast Attenuation (%) 78.57 %
Estimated Calories per 12 oz Pour 185.67 kcal
Inputs
⚡ Scenarios:
SG
Original Gravity (OG) before fermentation (e.g., 1.056).
SG
Final Gravity (FG) after fermentation completes (e.g., 1.012).
Results & Graph
Alcohol By Volume (ABV %)
5.93 % ABV
Standard Linear ABV ((OG−FG)×131.25)
5.78 % ABV
Apparent Yeast Attenuation (%)
78.57 %
Estimated Calories per 12 oz Pour
185.67 kcal

Alcohol By Volume (ABV %)

Graph 1 • Homebrewing ABV & Attenuation • Domain Architecture & Live Telemetry Maps Original Gravity Og, Final Gravity Fg through Homebrewing ABV & Attenuation Formula.
FOOD, BEVERAGE & BREWING Alcohol By Volume (ABV %) 5.93 % ABV Standard Linear ABV ((OG−F 5.78 % ABV Homebrewing ABV & Attenuation • Component Waterfall Alcohol By Volume (ABV %) 5.93 % ABV Standard Linear ABV ((OG−FG)×1 5.78 % ABV Apparent Yeast Attenuation (%) 78.57 % Estimated Calories per 12 oz P 185.67 kcal
Graph 2 • Alcohol By Volume (ABV %) Across Original Gravity Og Sweep (40% → 160%) Evaluates ABV_std = (OG − FG) × 131.25; ABV_alt = [ 76.08 × (OG − FG) / (1.775 − across 7 operating points (current input highlighted).
0 % ABV 425.4 % ABV 850.8 % ABV 0 0.422SG 0 0.634SG 0 0.845SG 5.93 1.06SG 48.68 1.27SG 152.2 1.48SG 773.5 1.69SG
Graph 3 • Joint Sensitivity: Original Gravity Og × Final Gravity Fg Compares Alcohol By Volume (ABV %) when Final Gravity Fg is shifted +25% (solid) vs. −25% (dashed).
0 % ABV 49.71 % ABV 99.42 % ABV --- Final Gravity Fg @ 75% 0 -30% 0 -15% 0 +0% 0 +15% 32.56 +30%
Summary: Fermenting from OG 1.056 to FG 1.012 produces 5.93% ABV (standard formula: 5.78%), 78.6% apparent attenuation, and ~186 kcal per 12 oz pour.
Summary: Fermenting from OG 1.056 to FG 1.012 produces 5.93% ABV (standard formula: 5.78%), 78.6% apparent attenuation, and ~186 kcal per 12 oz pour.
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Interactive chart & math engine powered by CalculatorGraph

Formula & Mathematical Methodology: Homebrewing ABV & Attenuation Formula

ABVstd = (OG − FG) × 131.25
ABValt = [ 76.08 × OG − FG1.775 − OG ] × (FG / 0.794)
ApparentAttenuation% = OG − FGOG − 1
ABV_std = (OG − FG) × 131.25; ABV_alt = [ 76.08 × (OG − FG) / (1.775 − OG) ] × (FG / 0.794); ApparentAttenuation% = (OG − FG) / (OG − 1)
  • originalGravityOg: Original Gravity (OG) before fermentation (e.g., 1.056).
  • finalGravityFg: Final Gravity (FG) after fermentation completes (e.g., 1.012).

Rounding: Internal floating-point calculations preserve full precision; currency and percentage outputs round to 2 decimal places.

Worked Example: Homebrewing ABV & Attenuation Worked Example

Compute ABV %, Apparent Attenuation %, Plato equivalents, and calories from Original & Final Gravity.

  1. Enter your operational, financial, or physical measurement inputs.
  2. Apply the standard domain equation: ABV_std = (OG − FG) × 131.25; ABV_alt = [ 76.08 × (OG − FG) / (1.775 − OG) ] × (FG / 0.794); ApparentAttenuation% = (OG − FG) / (OG − 1).
  3. Review the primary result, sensitivity metrics, and 3 interactive SVG graphs.
Result: Calculates Homebrewing ABV & Attenuation via ABV_std = (OG − FG) × 131.25; ABV_alt = [ 76.08 × (OG − FG) / (1.775 − OG) ] × (FG / 0.794); ApparentAttenuation% = (OG − FG) / (OG − 1).

Frequently Asked Questions

How does the Homebrewing Alcohol By Volume (ABV), Apparent/Real Attenuation & Calories Calculator calculate results?

It computes ABV_std = (OG − FG) × 131.25; ABV_alt = [ 76.08 × (OG − FG) / (1.775 − OG) ] × (FG / 0.794); ApparentAttenuation% = (OG − FG) / (OG − 1) directly in your browser and updates three custom SVG visualizations in real time.

Can I use Goal Seek to solve backwards for any input variable?

Yes. Click "🎯 Goal Seek" in the results toolbar to solve backwards for any input parameter.

Are my business and personal numbers kept private?

Yes. All calculations execute 100% locally in your browser with zero server transmission.

Everyday Life · Food, Beverage & Brewing

Homebrewing Alcohol By Volume (ABV), Apparent/Real Attenuation & Calories Calculator: inputs, method, and how to read the result

Compute ABV %, Apparent Attenuation %, Plato equivalents, and calories from Original & Final Gravity.

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: Original Gravity (OG) before fermentation (e.g., 1.056).
  • Final Gravity Fg: Final Gravity (FG) after fermentation completes (e.g., 1.012).

What the calculation includes

With the default values shown, Alcohol By Volume (ABV %) is 5.93 % ABV. The calculation follows Homebrewing ABV & Attenuation 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 5.93 % ABV to 24.52 % ABV. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses industry-standard APICS/ASCM supply chain, lean manufacturing, and consumer physics formulas.
  • Actual commercial freight tariffs, marketplace commissions, and utility rates vary by carrier and contract.

Scope: Global Supply Chain, Business & Consumer Standard Check the assumptions and limitations against your situation before relying on the estimate.

More in Everyday Life: ROI Calculator (Return on Investment), Percentage Calculator.