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

Seed tannin index

Seed tannin index from the harvest bench assay; browner, riper seeds score higher.

Ripeness threshold

Index at or above which the seeds are counted ripe for picking decisions.

Judge seed maturity by comparing the brown-seed tannin index against the block's ripeness threshold. 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]

Seeds ripe

Whether the seeds meet the ripeness threshold.

• 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.

• Protein Stability Bentotest Checker

  Judge a Bentotest heat trial by comparing the turbidity increase against the stability threshold.

• Red Wine Polymeric Pigment Index Checker

  Compare a polymeric-pigment assay result with a caller-selected threshold; crossing the threshold does not by itself establish long-term color stability.

• Volatile Acidity VA Threshold Checker

  Check volatile acidity against the general United States limits of 1.4 grams per liter for red wine and 1.2 grams per liter for white or rosé wine, expressed as acetic acid.