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

Gravity drop

Original gravity minus final gravity.

Estimate alcohol by volume from the specific-gravity drop using ABV ≈ gravity drop × 131.25; this common fermentation shortcut is not a laboratory alcohol measurement. 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]

Alcohol by volume (%)

Approximate alcohol by volume of the wine.

• 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.

• Fermentation Completion ABV Estimator

  Estimate alcohol by volume from original and final specific gravity using ABV ≈ (starting SG − finishing SG) × 131.25; the shortcut is not a laboratory alcohol measurement.

• Potential Alcohol from SG Calculator

  Convert must specific gravity to approximate Brix and then potential alcohol with a caller-selected ABV-per-Brix factor; residual sugar and fermentation efficiency can change actual ABV.

• Bottle Headspace Oxygen Inventory Calculator

  Calculate the gaseous oxygen inventory in a headspace from its volume, oxygen fraction, and oxygen density; this is not a prediction that all headspace oxygen will dissolve into the wine.