SO2 / Sulfite Calculator

Calculate potassium metabisulfite additions from current free SO2, molecular targets, pH, temperature, and volume.

Inputs

Current Free SO2 (mg/L)

Target Molecular SO2 (mg/L)

Temperature (C)

Wine Volume

Volume Unit

Results

Target Free SO2

35.7 mg/L

Current: 20.0 mg/L

Free SO2 Increase Needed

15.7 mg/L

Additional free SO2 required.

Potassium Metabisulfite

104.4 g

0.230 lb

Formula basis: free SO2 target = molecular target × (1 + 10^(pH - pKa)); K-meta assumes 57% available SO2 by weight.