Food and Hobbies
ABV Calculator
ABV Calculator estimate fermented beverage alcohol by volume and apparent attenuation from original and final specific gravity.
Food and Hobbies
ABV Calculator
Estimate fermented beverage alcohol by volume and apparent attenuation from original and final specific gravity.
Formula
ABV approximately = (original gravity - final gravity) x 131.25; attenuation = (OG - FG) / (OG - 1) x 100%.
About the ABV Calculator
Estimate fermented beverage alcohol by volume and apparent attenuation from original and final specific gravity.
How the ABV Calculator Works
The gravity drop is converted with the common linear brewing estimate and divided by original extract above water density to estimate apparent attenuation.
Formula
ABV approximately = (original gravity - final gravity) x 131.25; attenuation = (OG - FG) / (OG - 1) x 100%.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Original gravity (required).
- Final gravity (required).
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Estimated alcohol by volume (%)
- Apparent attenuation (%)
- Gravity points consumed
- Approximate alcohol by weight (%)
ABV Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Original gravity | 1.06 |
| Final gravity | 1.012 |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
The linear equation is an estimate and can be less accurate for high-gravity fermentation. Calibrated temperature-corrected hydrometer or refractometer readings are required.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the ABV Calculator calculate?
Estimate fermented beverage alcohol by volume and apparent attenuation from original and final specific gravity.
Which formula does the ABV Calculator use?
ABV approximately = (original gravity - final gravity) x 131.25; attenuation = (OG - FG) / (OG - 1) x 100%. The gravity drop is converted with the common linear brewing estimate and divided by original extract above water density to estimate apparent attenuation.
What should I check before using the ABV Calculator result?
The linear equation is an estimate and can be less accurate for high-gravity fermentation. Calibrated temperature-corrected hydrometer or refractometer readings are required.