Wine Sugar Addition Calculator

Work out wine sugar addition instantly with clear inputs, formula shown and shareable results.

About Wine Sugar Addition Calculator

Potential alcohol is about 0.59 times the Brix reading, and roughly 17 g of sugar per litre is needed for each additional percent of alcohol. Chaptalisation raises alcohol without adding flavour, so calculating the exact deficit avoids the hot, unbalanced result that comes from over-sugaring by guesswork.

Formulas

Potential alcohol

potential ABV % = Brix x 0.59

Sugar addition

sugar grams per litre = (target ABV - potential ABV) x 17

Worked example

With the default values below, Wine Sugar Addition Calculator returns Sugar to add of 0.408. Change any input above and every figure here is recalculated in your browser.

Inputs used

Must volumeminimum 0.5 L: 20 L
Current sugar readingaccepts 0–40 Brix: 20 Brix
Target alcoholaccepts 1–20 %: 13 %

Results

Sugar to add: 0.408 kg
Alcohol the must would reach as is: 11.80%
Brix after chaptalisation: 22.00 Brix
Sugar per litre: 20.4 g

Step by step

1Values used
2Potential alcohol
3Sugar addition
4Sugar to add= 0.408 kg
5Alcohol the must would reach as is= 11.80
6Brix after chaptalisation= 22.00 Brix
7Sugar per litre= 20.4 g

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Wine Sugar Addition figure worked out?

potential ABV % = Brix x 0.59. Potential alcohol is about 0.59 times the Brix reading, and roughly 17 g of sugar per litre is needed for each additional percent of alcohol.

Why does this matter?

Chaptalisation raises alcohol without adding flavour, so calculating the exact deficit avoids the hot, unbalanced result that comes from over-sugaring by guesswork.

What do I need to enter?

Enter must volume, current sugar reading, target alcohol. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.