ABV Calculator
Free Abvcalculator Calculator for drinks recipes. Enter amounts to convert, scale, or adjust ingredients precisely. Enter your values for instant results.
Formula
ABV = (OG - FG) x 131.25
Where OG = Original Gravity (before fermentation), FG = Final Gravity (after fermentation). The constant 131.25 converts the gravity difference into alcohol percentage by volume. Apparent Attenuation = (OG - FG) / (OG - 1.000) x 100.
Worked Examples
Example 1: Standard Pale Ale ABV
Problem: A pale ale has an original gravity of 1.055 and final gravity of 1.012. Calculate the ABV and apparent attenuation.
Solution: ABV = (OG - FG) x 131.25\nABV = (1.055 - 1.012) x 131.25\nABV = 0.043 x 131.25 = 5.64%\n\nApparent Attenuation = (OG - FG) / (OG - 1.000) x 100\n= (1.055 - 1.012) / (1.055 - 1.000) x 100\n= 0.043 / 0.055 x 100 = 78.2%
Result: ABV: 5.64% | Apparent Attenuation: 78.2%
Example 2: Imperial Stout Calorie Count
Problem: An imperial stout has OG 1.090, FG 1.022, served in a 16oz pint. How many standard drinks is this?
Solution: ABV = (1.090 - 1.022) x 131.25 = 8.93%\nAlcohol in oz = (8.93 / 100) x 16 = 1.429 oz pure alcohol\nStandard drinks = 1.429 / 0.6 = 2.38 standard drinks\n\nThis imperial stout contains roughly 2.4 standard drinks per 16oz pint, which is significantly more than a typical light beer (about 0.8 standard drinks per 12oz).
Result: ABV: 8.93% | Standard Drinks per Pint: 2.38
Frequently Asked Questions
What is ABV and how is it calculated?
ABV stands for Alcohol By Volume, representing the percentage of a beverage that is pure alcohol. It is calculated using the original gravity (OG) and final gravity (FG) readings taken with a hydrometer or refractometer before and after fermentation. The standard formula is ABV = (OG - FG) x 131.25. For example, a beer with an OG of 1.050 and FG of 1.010 has an ABV of (1.050 - 1.010) x 131.25 = 5.25%. The principle works because yeast converts sugar into alcohol and carbon dioxide during fermentation. Since alcohol is lighter than water, the gravity reading decreases as sugar is consumed, and the difference between the two readings directly correlates with alcohol content.
Can I use ABV Calculator on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
Can I use the results for professional or academic purposes?
You may use the results for reference and educational purposes. For professional reports, academic papers, or critical decisions, we recommend verifying outputs against peer-reviewed sources or consulting a qualified expert in the relevant field.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
Does ABV Calculator work offline?
Once the page is loaded, the calculation logic runs entirely in your browser. If you have already opened the page, most calculators will continue to work even if your internet connection is lost, since no server requests are needed for computation.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.