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Dilution Calculator

How much water to add when your gravity is too high

Overshot your target gravity? This calculator tells you exactly how much water to add to bring it back down. Enter your current volume and gravity, set your target, and it gives you the water volume needed.

Sparge / Dilution

water addition

Hit your target OG every time.
Use pre-boil for sparge adjustments, or just before knockout for absolute precision.

Water to Add
4.00L
Total Volume
24.00L
60.0 pts × 20 L = 50.0 pts × 24.00 L

How We Calculate It

Gravity Points Conservation
Vtotal=Vcurrent×GcurrentGtargetV_{total} = \frac{V_{current} \times G_{current}}{G_{target}}

Sugar doesn't disappear when you add water. The total gravity points stay constant. Water to add = total volume − current volume.

This is basic conservation of mass. The gravity points (sugar content) in your wort don't change when you add water. You're just spreading them across a larger volume. It's exact, not an approximation.

See all the numbers come together in real time.

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Related Topics

Boil-OffCalculate post-boil volume from pre-boil measurements and target OG.Gravity & ABVHow original gravity is built from your grain bill, and the path from OG to FG to alcohol.