Use this oenology calculation to document or plan a defined fermentation, blending, adjustment, stabilization, aging, packaging, sensory, or cellar operation from measured wine parameters.

Current free SO2 (mg/L)

Free SO2 measured in the wine now.

pH

Measured pH of the wine.

Target molecular SO2 (mg/L)

Molecular SO2 target selected for the wine and objective.

Calculate the equilibrium free-SO2 level corresponding to a caller-selected molecular SO2 target at the measured pH and the shortfall from current free SO2; actual additive dose must account for binding. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Additional dose (mg/L)

Increase in measured free SO2 needed, not additive product mass.

Required free SO2 (mg/L)

Total free SO2 required for the molecular target.

• Wine chemistry and microbiology depend on temperature, pH, alcohol, sugar, matrix, measurement method, microbial state, legal limits, product formulation, and bench-trial response. Generic doses and thresholds are not production instructions for every wine.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm measurements with calibrated winery methods, run scaled bench trials, record additions and lot volumes, check local regulations and supplier specifications, and obtain professional laboratory advice for faults or stability risks.

• KMBS Grams for Target ppm Calculator

  Calculate theoretical potassium-metabisulfite mass for a requested SO2 addition from the product's stated SO2 content; binding means the measured free-SO2 increase may be lower.

• Gelatin-Silica Gel Pairing Dose Calculator

  Convert caller-selected gelatin and silica-gel pairing rates into total product quantities for a wine lot; product concentration and treatment rates must come from trials or supplier instructions.

• H2O2 SO2 Reduction Dose Calculator

  Calculate the theoretical hydrogen-peroxide solution volume for a 1:1 molar reaction with a specified SO2 mass; actual wine treatment requires controlled trials, analysis, and regulatory review.