Short description of Sulphite Calculator 3.00: Sulphite Calculator can assist the winemaker in calculating the correct amount of sulphite to add in order to achieve desired SO2 levels in wine. With Sulphite Calculator, the winemaker can precisely define the sulphite source, sulphite form, and batch size. The software can then calculate the exact amount of sulphite required in order to obtain desired SO2 levels.