Food & BeverageFree
SO₂ Dosing Calculator
Calculate potassium metabisulfite additions to achieve target free SO₂ levels in wine.
Inputs
L
ppm
ppm
White: 25-40 ppm, Red: 20-35 ppm
Results
K-Meta (K2S2O5)
1.01 g
Campden Tablets
2.3 tablets
Molecular SO2 at Target0.70 ppm
SO2 to Add25 ppm
SO2/Sulfite Dosing Calculator
Artysan by Irora Labs
July 16, 2026
Inputs
| Wine Volume | 23 L |
| Current Free SO2 | 10 ppm |
| Target Free SO2 | 35 ppm |
| Wine pH | 3.5 |
Results
| K-Meta (K2S2O5) | 1.01 g |
| Campden Tablets | 2.3 tablets |
Created with Artysan. artisan.iroralabs.com/craft-calculators/so2-dosing
Tips
1
Lower pH wines need less SO₂ for the same level of protection, so always measure pH first2
Typical free SO₂ targets: 25-35 ppm for reds, 30-50 ppm for whitesOpen formula
K₂S₂O₅ (mg) = Volume (L) × Target ppm × (1 / 0.5725)
Calculates potassium metabisulfite needed based on volume and target free SO₂.
Molecular SO₂ depends on pH. Lower pH = more protection per ppm.
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