Calculate your wine's alcohol by volume from original and final gravity readings, in specific gravity or Brix. Shows the wine ABV (Duncan & Acton), the simple formula, and Hall's beer formula for comparison, plus apparent attenuation.
Calculate alcohol by volume from original and final gravity readings.
e.g. 1.090
Dry wine ≈ 0.990–1.000
ABV (wine)
12.77%
ABV (simple)
12.47%
ABV (Hall — beer)
13.22%
Attenuation
105.6%
Track this in your batch log
MakeWine is a free winemaking app — log additions, lab readings and fermentations, and get a deterministic assistant. No card required.
The simple estimate is ABV = (OG − FG) × 131.25. For a dry wine the calculator also shows Duncan & Acton's wine formula, which is the figure to quote — it stays accurate at the low finishing gravities wine reaches. Hall's formula is shown for comparison only: it was fitted to beer and over-reads on dry wine.
Yes — switch the gravity unit to Brix and enter your refractometer readings; the calculator converts to SG internally.
Calculations are estimates based on standard winemaking formulas (Henderson–Hasselbalch for SO₂, Duncan & Acton for wine ABV, standard addition rates). Always verify critical additions with a reference or lab analysis. The decision and responsibility for any addition rest with you.