# Alcohol

The Alcohol calculator helps you determine the alcohol content, attenuation, and nutritional information of your beer based on Original Gravity (OG) and Final Gravity (FG) measurements.

![Enter OG and FG to get important stats about your product](https://771697612-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LEzhWP2LGeXaKgS2qr4%2F-LFRyl_P6JbL2o6antht%2F-LFRyrZ7JDLgWKBe5Qe7%2Fimage.png?alt=media\&token=8a451cf4-0623-47d3-b81f-8be31d9eca2c)

## How to Use

1. **Enter Original Gravity (OG)**
   * Measure your wort gravity before fermentation begins
   * Input the value in your preferred unit (SG, Plato, or Brix)
2. **Enter Final Gravity (FG)**
   * Measure gravity when fermentation is complete
   * Use the same unit system as your OG for consistency
3. **View Results**
   * All calculations update automatically
   * Results are shown in your preferred units from Settings

## What This Tool Calculates

### Alcohol Content

* **ABV (Alcohol by Volume)** - The percentage of alcohol by volume in your finished beer
* **ABW (Alcohol by Weight)** - The percentage of alcohol by weight, used in some regions

### Attenuation

* **Apparent Attenuation** - The percentage of sugars that appear to have been consumed by yeast
* **Real Attenuation** - The actual percentage of sugars consumed, accounting for alcohol's effect on gravity

### Extract Values

* **Original Extract** - The Plato equivalent of your original gravity
* **Apparent Extract** - The Plato equivalent of your final gravity
* **Real Extract** - The actual remaining extract, correcting for alcohol presence

### Nutritional Information

* **Calories** - Estimated calories per serving (per 100ml or per 12 oz)
* **Carbohydrates** - Estimated carbs per serving
* **Kilojoules (kJ)** - Energy content in kilojoules

## Understanding the Results

### ABV Ranges by Style

* **Light Beers**: 2.5-4.5% ABV
* **Standard Beers**: 4.5-6% ABV
* **Strong Beers**: 6-9% ABV
* **Very Strong Beers**: 9-14% ABV

### Attenuation Guidelines

* **Low Attenuation**: 65-70% (sweeter, fuller body)
* **Medium Attenuation**: 70-75% (balanced)
* **High Attenuation**: 75-80% (drier, lighter body)
* **Very High Attenuation**: 80-85%+ (very dry)

## Tips for Accurate Measurements

* **Temperature Correction**: Always correct hydrometer readings for temperature
* **CO2 Degassing**: Degas samples before taking FG readings to avoid CO2 affecting the measurement
* **Multiple Readings**: Take readings over several days to confirm fermentation is complete
* **Calibrate Equipment**: Regularly check hydrometer calibration with distilled water

## Using with Your Brewing

* The tool remembers your last entered OG and FG values
* Use alongside your batch tracking for consistent results
* Reference the calculated values when logging your batch data

## Troubleshooting

**High Final Gravity**

* Check yeast health and fermentation temperature
* Consider yeast nutrient additions

**Lower than Expected ABV**

* Verify OG measurement accuracy
* Ensure fermentation completed fully

**Unexpected Attenuation**

* Different yeast strains have varying attenuation levels
* Mash temperature affects fermentability

## Related docs

* [Batches](https://docs.brewfather.app/batches)
* [Fermenting](https://docs.brewfather.app/batches/fermenting)