ABV Calculatorv1.0.0

Use this ABV Calculator to determine the alcohol content of your homebrew, wine, cider, or mead from hydrometer or refractometer readings. Enter your gravity values before and after fermentation to get an instant ABV estimate along with apparent attenuation and calorie count.

• Enter your Original Gravity (OG) reading taken before fermentation begins. This is the specific gravity of your unfermented wort, must, or juice. A typical beer OG ranges from 1.030 to 1.120, while wine can range from 1.070 to 1.130.
• Enter your Final Gravity (FG) reading taken after fermentation is complete. This measures the remaining sugar and dissolved solids. FG is always lower than OG for a successful fermentation.
• Both fields accept decimal values (1.050), fractions (21/400 for a gravity point offset), and mixed numbers. The calculator sanitizes input automatically.
• Click Calculate or simply wait for the auto-calculation to run after you stop typing. Results update within half a second of your last keystroke.
• Open Settings to choose between the Standard formula, which uses the simplified (OG - FG) x 131.25 equation, and the Alternate formula (Daniels Method), which accounts for the nonlinear relationship between gravity and alcohol at higher ABV values.
• Enable Show step-by-step formulas in Settings to see the full mathematical derivation, including substituted values and intermediate results.
• Click Reset to restore all fields to their default values and clear saved data.

The Standard formula is ABV = (OG - FG) x 131.25. The Alternate (Daniels) formula is ABV = (76.08 x (OG - FG) / (1.775 - OG)) x (FG / 0.794), which provides greater accuracy for high-gravity fermentations above 6% ABV. Apparent attenuation is calculated as ((OG - FG) / (OG - 1)) x 100 and indicates the percentage of available sugar consumed by yeast.

Determine the alcohol content of fermented beverages across a wide range of brewing and winemaking scenarios. Whether you are a beginner or experienced fermenter, accurate ABV tracking supports recipe development, quality control, and regulatory compliance.

• Homebrewing: Track the ABV of each batch to refine recipes over time. Compare OG and FG readings across batches to identify yeast performance trends and fermentation consistency.
• Winemaking: Measure the alcohol yield from grape must or fruit juice. Predict whether a wine will finish dry, off-dry, or sweet based on expected attenuation levels.
• Cider and Mead Production: Calculate ABV for apple cider, perry, or honey-based mead. Monitor fermentation progress by taking periodic gravity readings and comparing them to the original measurement.
• Recipe Development: Estimate the expected ABV before brewing day by entering a target OG and projected FG based on yeast attenuation data. Adjust grain bills or sugar additions to hit a desired alcohol level.
• Competition Preparation: Verify that a beer or wine falls within the ABV range specified by BJCP or other style guidelines. Use the category classification to quickly confirm style compliance.
• Calorie Tracking: Estimate the calorie content of a 12-ounce serving for health-conscious brewers or those managing dietary intake while enjoying homebrew.
• Education: Learn how fermentation converts sugar into alcohol and carbon dioxide. Use the step-by-step formula display to understand the mathematical relationship between gravity readings and ABV.
• Quality Control: Identify stuck fermentations early by comparing the expected FG to the actual reading. Low attenuation values may indicate yeast health issues or fermentation temperature problems.