Chaptalization Calculator
Find the sugar to add to a wine must to raise it from its current Brix to a target Brix. A winemaking reference (and legally restricted in some regions) — see the disclaimer below.
Calculator
Non-regulatory estimateEnter your must’s current and target sugar reading and its volume to find the sugar to add.
⚠️ This is a reference estimate for winemaking — not an official measurement, and never valid for a tax or label filing.
Chaptalization (adding sugar to must) is legally restricted or prohibited in some winegrowing regions. This calculator enforces no legal limit — check the rules for your jurisdiction.
Enter the current and target readings and a volume to see the sugar to add.
Estimate only — this uses a provisional working factor of 10 g/L of sugar per °Brix. Published guidance varies (roughly 10–17 g/L depending on the must), and this figure is pending expert verification, so treat the result as a starting point and confirm against a hydrometer reading after you add the sugar.
Reference tools, not a system of record. These free calculators are provided for convenience and general reference only. They are not a system of record and must not be used as the basis for any TTB or state compliance filing — even when a result is correct. Your official filings are governed by the applicable measurement and gauging methods and by your own production records.