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The Solera Library · Reference

Reference tables and conversion charts

Lookup tables printed in full, with the formula behind each one and an explanation of where it stops being reliable. No calculators to load and nothing that requires JavaScript, so the numbers are readable on a phone in a cellar with no signal. Part of the Solera Library.

Available tables

3 tables
Conversion Brix to Potential Alcohol Specific gravity, sugar in grams per liter, and potential alcohol at both the 0.55 and 0.59 conversion factors. 16.0 – 30.0 Brix, 0.5 steps Additions Molecular SO2 by pH Free SO2 required to hold 0.5 mg/L molecular for reds and 0.8 mg/L for whites, at the pKa of 1.81. pH 2.90 – 4.00, 0.05 steps Yield Grape Tons to Cases Gallons, cases and bottles at 170 gallons per ton, plus the realistic range and fixed conversions for barrels, hectoliters and cases. 1 – 500 tons

Constants used across these tables

ConstantValueUsed for
Brix to alcohol conversion factor0.55 to 0.60 typicalPotential alcohol estimation
pKa of sulfur dioxide and bisulfite1.81 at 20 degrees CelsiusMolecular SO2 calculation
Wine gallons per ton of grapes170 planning standard, 150 to 180 realisticYield estimation
Gallons per standard case2.378 for twelve 750 ml bottlesCase to gallon conversion for reporting
Liters per US gallon3.785Metric conversion throughout

Every one of these is a convention or an approximation rather than a law of nature, and each table says where its own number stops being trustworthy. A winery that records its own results for two vintages will have better figures than any of them.

More in the library

These tables are one section of the Solera Library, alongside form by form filing walkthroughs, country compliance guides, and operations guides.

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