Dilution & Blending Calculator
Dilute a high-gravity wort to target, or blend two batches by gravity and ABV.
Dilute to target gravity
Add - L water
Final volume-
Blend two batches
Blended gravity-
Blended ABV-
How it works
Gravity points (the digits after 1.0, ×1000) times volume are conserved when you add water or mix batches, so both dilution and blending reduce to simple point arithmetic.
water = volume × (currentPoints / targetPoints − 1)
blend = (points₁·V₁ + points₂·V₂) / (V₁ + V₂)
Source: gravity-points conservation - a definitional identity (gravity points × volume is conserved on mixing); see Brewer's Friend tooling for the same math.
Gravity points conservation is exact; real-world topping-up also dilutes hop bitterness and colour proportionally.
Frequently asked questions
- How do I dilute wort to a lower gravity?
- Add water. Because gravity points are conserved, the water needed depends on your current volume and the gap between your current and target gravity. Enter all three and the tool returns the litres of water to add.
- How do I blend two batches?
- The blended gravity (and ABV) is the volume-weighted average of the two. Use the blending section to combine, for example, an over-strong batch with a weaker one to hit a target.