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

Fructose-dominant threshold

Ratio at or above which the high category begins.

Fructose (g/L)

Fructose measured in the fermenting wine.

Watch threshold

Ratio at or above which the watch category begins.

Glucose (g/L)

Glucose measured in the fermenting wine.

Calculate the fructose-to-glucose ratio and compare it with caller-selected watch and fructose-dominant thresholds; the ratio alone does not diagnose a stuck fermentation. 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]

F/G ratio

Fructose divided by glucose.

Status

One of below_watch_threshold, watch, or fructose_dominant.

• 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 Heat Exposure Degree-Hours Calculator

  Calculate temperature-exposure degree-hours above a caller-selected critical temperature; the index quantifies exposure but does not independently predict yeast injury.

• 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.

• Charcoal Color Fix Dose Calculator

  Convert a selected activated-charcoal treatment rate into total mass and compare it with a caller-supplied product, trial, or regulatory limit.