Alcohol Dilution Calculator
Calculate how much water to add and total final volume when diluting spirits or alcohol from initial ABV to target ABV.
Open toolABV Calculator
Estimate alcohol by volume from original and final measured specific gravities. Provide Original specific gravity, Final specific gravity, Empirical formula to compute results directly in your browser. Simple model: (OG-FG)*131.25. Alternate: 76.08*(OG-FG)/(1.775-OG)*(FG/0.794). Requires OG>=FG and alternate OG<1.775; empirical estimate, no laboratory assay. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur.
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Enter the inputs, then select Calculate.
Your result
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How the ABV Calculator Works & Core Formula
The ABV Calculator evaluates Original specific gravity, Final specific gravity, Empirical formula in client-side JavaScript using the deterministic rule below and updates the output panel immediately without uploading data to a server.
Estimate alcohol by volume from original and final measured specific gravities.
Simple model: (OG-FG)*131.25. Alternate: 76.08*(OG-FG)/(1.775-OG)*(FG/0.794). Requires OG>=FG and alternate OG<1.775; empirical estimate, no laboratory assay. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur.
ABV Calculator Quick Reference & Input Guide
Review the input parameters, allowed value ranges, and worked reference cases for the ABV Calculator below before running your calculation.
| Parameter / Scenario | Default / Sample Value | Rule or Allowed Range | Output / Usage Note |
|---|---|---|---|
| Input: Original specific gravity | 1.05 | Range: 0.5 to 2 | Required workspace parameter |
| Input: Final specific gravity | 1.01 | Range: 0.5 to 2 | Required workspace parameter |
| Input: Empirical formula | (User supplied) | Options: Simple 131.25, Alternate gravity model | Required workspace parameter |
| Worked Case 1: Baseline run (Original specific gravity = 1.05) | Preloaded / test values | Estimate alcohol by volume from original and final measured specific gravities | Original specific gravity = 1.05; Final specific gravity = 1.01; Empirical formula = Simple 131.25. The displayed output is Estimated ABV: 5.25%. |
| Worked Case 2: Comparison scenario (abv calculator cocktail) | Preloaded / test values | Estimate alcohol by volume from original and final measured specific gravities | Original specific gravity = 1.06; Final specific gravity = 1.015; Empirical formula = Alternate gravity model. The displayed output is Estimated ABV: 6.12100191999%. |
Step-by-Step Guide to Using the ABV Calculator
Follow these three steps to configure Original specific gravity, Final specific gravity, Empirical formula, verify unit and boundary rules, and export your ABV Calculator output.
Input and settings
Complete the other inputs
Set final specific gravity, empirical formula. Simple model: (OG-FG)*131.25.
Tool result
Calculate and read the output
Select Calculate to see the estimated alcohol percentage. Copy result copies this text; Download saves it as a TXT file.
Review the details
Practical Worked Examples for ABV Calculator
These concrete scenarios illustrate how the ABV Calculator processes baseline inputs, comparison checks, and boundary constraints.
Baseline run (Original specific gravity = 1.05)
Original specific gravity = 1.05; Final specific gravity = 1.01; Empirical formula = Simple 131.25. The displayed output is Estimated ABV: 5.25%.
Comparison scenario (abv calculator cocktail)
Original specific gravity = 1.06; Final specific gravity = 1.015; Empirical formula = Alternate gravity model. The displayed output is Estimated ABV: 6.12100191999%.
Boundary & unit check (ABV Calculator)
When solving for 'abv calculator', verify that Original specific gravity, Final specific gravity, Empirical formula use consistent units and stay within the documented scope: Simple model: (OG-FG)*131.25. Alternate: 76.08*(OG-FG)/(1.775-OG)*(FG/0.794). Requires OG>=FG and alternate OG<1.775; empirical estimate, no laboratory assay. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur.
How to Read and Verify the ABV Calculator Output
The output panel reports the exact result derived from Original specific gravity, Final specific gravity, Empirical formula alongside any unit or formatting notes.
The result is the estimated alcohol percentage. Compare measured original and final specific gravity in your brewing notes.
Keep the selected empirical formula with the result; gravity measurements are not an alcohol assay.
Numerical output shows up to 12 significant digits. Floating-point arithmetic and display rounding can affect the last digits.
- Example input
- Original specific gravity = 1.05; Final specific gravity = 1.01; Empirical formula = Simple 131.25
- Example output
- Estimated ABV: 5.25%
Scope Limits, Accuracy Assumptions & Related Everyday Math Tools
Review these boundary constraints and validation rules before relying on the ABV Calculator output.
Operational scope: Simple model: (OG-FG)*131.25. Alternate: 76.08*(OG-FG)/(1.775-OG)*(FG/0.794). Requires OG>=FG and alternate OG<1.775; empirical estimate, no laboratory assay. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur. Inputs that violate minimum/maximum bounds or required format rules are rejected with a clear diagnostic prompt.
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Open toolFrequently Asked Questions About ABV Calculator
Answers about using ABV Calculator and understanding its results.
What formula or rule does the ABV Calculator use?
The ABV Calculator applies the rule: Estimate alcohol by volume from original and final measured specific gravities. Enter Original specific gravity, Final specific gravity, Empirical formula into the workspace and the tool computes the exact output in your browser.
What input parameters and units are required for ABV Calculator?
Yes. Provide Original specific gravity, Final specific gravity, Empirical formula using the documented units and format shown in the quick reference table above. Preloaded default values let you test the workflow immediately.
What are the accuracy limits and boundary assumptions for ABV Calculator?
Simple model: (OG-FG)*131.25. Alternate: 76.08*(OG-FG)/(1.775-OG)*(FG/0.794). Requires OG>=FG and alternate OG<1.775; empirical estimate, no laboratory assay. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur. Confirm that your inputs fall within the allowed ranges before exporting the result.
Is the ABV Calculator free and does it keep my inputs private?
Yes. All calculations for the ABV Calculator execute 100% locally in your browser's JavaScript runtime. No inputs or results are uploaded to any external server.
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