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

SO2 content (%)

Sulfur dioxide mass fraction stated for the KMBS product.

Target increase (mg/L)

Desired theoretical SO2 addition.

Volume (L)

Volume of wine or must to treat.

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. 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]

KMBS (g)

Potassium metabisulfite to weigh out.

• 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.

• Target Free SO2 Dose Calculator

  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.

• Malic Acid Addition Calculator

  Calculate theoretical malic-acid mass for a desired TA increase reported as tartaric-acid equivalents, using the equivalent-weight ratio 67.04/75.05; confirm the post-addition TA analytically.

• Yeast Nutrient Grams per hL Calculator

  Convert a yeast-assimilable-nitrogen gap into nutrient grams per hectoliter using the measured or manufacturer-stated YAN contribution for the exact nutrient product.