Wine Sulfite Calculator
Calculate how much SO2 or potassium metabisulfite to add to your wine based on volume, pH, and current free SO2 levels.
How to Use the Wine Sulfite Calculator
- Enter the volume of wine in liters.
- Enter the current free SO2 level (test with a kit or titration).
- Enter your target free SO2 level.
- Enter the wine pH.
- Click Calculate to get the SO2 and potassium metabisulfite additions.
Casi d'Uso
- •Sulfiting wine at crush or pressing.
- •Topping up SO2 before bottling.
- •Calculating additions after testing free SO2.
- •Adjusting sulfite levels during aging.
Formula
SO2 to add (mg) = (target − current free SO2) × volume (L). K-meta (g) = SO2 mg ÷ 0.57 ÷ 1000.
Domande Frequenti
What is free SO2 and why does it matter?
Free SO2 is the active form of sulfite that protects wine from oxidation and microbial spoilage. Maintaining the right level is critical for wine stability.
What is a typical target free SO2?
For dry wines, 25–35 ppm is common. For wines with higher pH (above 3.5), a higher free SO2 is needed because less is in the protective molecular form.
What is potassium metabisulfite?
K-meta (K2S2O5) is the most common form of sulfite used in winemaking. It releases SO2 when dissolved and is about 57% SO2 by weight.