The beer dilution calculator calculates how much water to add to high-gravity beer to hit your target ABV, and blends two batches of different strengths to reach a target alcohol level.
Dilution Calculator
Blend Calculator
High-Gravity Brewing and Dilution
High-gravity brewing ferments at a higher gravity than the target then dilutes post-fermentation. This allows you to ferment more beer in the same vessel footprint, with dilution water added before packaging.
Important Dilution Considerations
Dilution water should ideally be de-oxygenated to prevent oxidation staling. Filter first if possible. When diluting, blend gently to minimize oxidation pickup. Temperature-match the water to the beer before blending. Account for the proportional reduction in hop bitterness and color — brew with higher IBU and SRM targets to compensate.
Frequently Asked Questions
Is this beer dilution calculator free?
Yes, completely free with no signup required.
Can I dilute beer with water after fermentation?
Yes. High-gravity (HG) brewing involves fermenting at a higher gravity and diluting with water post-fermentation to hit a lower target ABV. This technique is used commercially to maximize fermenter throughput. Quality results require good filtration and deoxygenated water.
Does dilution affect hop bitterness and color?
Yes. When you dilute beer, all components are proportionally reduced — bitterness (IBU), color (SRM/EBC), and flavor intensity all decrease. Plan your recipe with a higher starting IBU/color to account for the dilution effect.
What ABV can high-gravity brewing achieve?
Most yeast ferment comfortably to 8-12% ABV. Belgian strains and champagne yeast can reach 12-15%. Beyond 15% requires step-feeding techniques or spirits-specific yeast. High-gravity brewing typically ferments to 9-12% then dilutes to the target 4-7%.
What is blending used for?
Blending two batches can achieve exact target strength, improve flavor balance, and increase volume. Common in sour beer production, whisky blending, and commercial craft brewing where multiple fermenters of different strengths can be combined to hit a consistent final product.