# Gravity Correction The Gravity Correction tool helps you adjust your wort's specific gravity to hit your target numbers. ![Calculate how much DME to add or how much to boil off if gravity is too low](https://771697612-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LEzhWP2LGeXaKgS2qr4%2F-LFRyl_P6JbL2o6antht%2F-LFRzZp_5fIURKgHUuIc%2Fimage.png?alt=media\&token=ed9c8707-6d2e-4dc2-a8e7-2702ec876143) ![Calculate how much water to add if gravity is too high](https://771697612-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LEzhWP2LGeXaKgS2qr4%2F-LFRyl_P6JbL2o6antht%2F-LFRzf-S2IOdn-oJVex5%2Fimage.png?alt=media\&token=de8e65b6-34da-4280-9734-d23661c8837d) ![Calculate how to correct the gravity by altering boil time if preferred](https://771697612-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LEzhWP2LGeXaKgS2qr4%2F-LFRyl_P6JbL2o6antht%2F-LFRzqyr1VqNl8N6oRjD%2Fimage.png?alt=media\&token=82707dda-517f-496c-9f9a-39b874c3cd83) ## How to Use 1. **Enter Current Volume** - Your wort volume 2. **Enter Current Gravity** - Take gravity reading 3. **Enter Target Gravity** - Your desired gravity 4. **Select Correction Method**: * Add DME/LME if too low * Add water if too high * Adjust boil time 5. **View Calculations** - Amount to add or time to boil ## When to Use * Pre-boil or post-boil gravity is off target * Correcting efficiency issues * Planning high-gravity dilutions ## Correction Methods ### If Gravity is Too Low **Option 1: Add Fermentables** * Calculate DME (Dry Malt Extract) addition * Calculate LME (Liquid Malt Extract) addition * Calculate sugar additions * Add fermentables during the boil **Option 2: Extend Boil Time** * Calculate additional boil time needed * Concentrate wort through evaporation * Adjust hop additions for extended boil * Monitor volume reduction ### If Gravity is Too High **Option 1: Add Water** * Calculate water volume needed * Use pre-boiled or distilled water * Add before or after boil * Consider mineral adjustments **Option 2: Reduce Boil Time** * Calculate shorter boil duration * Less evaporation maintains volume * Adjust hop schedule accordingly ### Options **Boil-Off Rate**: Typically 2-6 L/hour (0.5-1.5 gal/hour) **Extract Values**: DME \~45 PPG, LME \~36 PPG ## Common Scenarios ### Pre-Boil Adjustment **Situation**: Mash efficiency lower than expected * Measure pre-boil gravity and volume * Calculate DME needed or extra boil time * Add DME early in boil for best integration * Adjust hop schedule if extending boil ### Post-Boil Adjustment **Situation**: Missed target OG after boiling * Cool sample for accurate reading * Add DME dissolved in small amount of water * Or dilute with pre-boiled water * Stir gently to incorporate ### High-Gravity Brewing **Situation**: Intentionally brewing concentrated wort * Plan dilution rate in advance * Calculate water needed at packaging * Maintain hop utilization ratios * Adjust yeast pitch rate ## DME/LME Addition Guidelines ### Typical Extract Values * **DME**: 45 PPG (points per pound per gallon) * **LME**: 36 PPG * **Table Sugar**: 46 PPG * **Corn Sugar**: 37 PPG ### Adding Extracts 1. Remove kettle from heat 2. Slowly add extract while stirring 3. Ensure complete dissolution 4. Return to boil 5. Watch for boil-overs ## Water Addition Guidelines ### Water Quality * Use filtered or distilled water * Pre-boil to remove chlorine * Cool to wort temperature * Consider mineral content ### When to Add Water * **Pre-boil**: Affects hop utilization * **Post-boil**: Maintains hop character * **In fermenter**: Easiest but requires sanitation * **At packaging**: For high-gravity beers ## Boil Time Adjustments ### Extending the Boil **Pros:** * No additional ingredients needed * Concentrates all wort components * Can improve clarity **Cons:** * Changes hop utilization * Increases melanoidin formation * Takes additional time * May darken wort ### Reducing Boil Time **Pros:** * Preserves delicate flavors * Lighter color retention * Saves time and energy **Cons:** * Less protein coagulation * Reduced DMS drive-off * May affect hop utilization ## Practical Examples ### Example 1: Low Efficiency * Target: 1.050 OG at 19 liters (5 gallons) * Actual: 1.042 at 21 liters (5.5 gallons) pre-boil * Solution: Add 340g (0.75 lbs) DME or boil extra 30 minutes ### Example 2: Over-efficiency * Target: 1.048 OG at 19 liters (5 gallons) * Actual: 1.056 at 18 liters (4.8 gallons) * Solution: Add 3 liters (0.8 gallons) water ## Tips for Success * **Take Multiple Readings**: Confirm gravity with multiple samples * **Mix Thoroughly**: Ensure even distribution of additions * **Temperature Matters**: Always temperature-correct readings * **Document Changes**: Note adjustments in brew log * **Plan Ahead**: Have DME on hand for corrections ## Using During Brew Day * Pre-calculate potential corrections before brewing * Keep DME or other correction supplies ready * Document actual values and corrections in your brew notes * Learn from efficiency patterns over time * Adjust future recipe planning based on your system's performance ## Prevention Tips ### Consistent Efficiency * Maintain consistent grain crush * Monitor mash pH * Ensure proper mash temperatures * Adequate sparging technique ### Accurate Measurements * Calibrate equipment regularly * Account for thermal expansion * Use proper sampling techniques * Mix wort before sampling --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.brewfather.app/tools/gravity-correction.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.