Tools you might need next
Calculate blend ratios to achieve target ABV from liquids of different alcohol concentrations. Wine, spirits, and cocktail blending math.
Calculate number of bottles from batch volume for wine, beer, and spirits. Standard 750ml, 375ml, and 1L bottle yields with loss allowance.
Estimate barrel aging volume loss from angel's share and calculate aged spirit yield. Evaporation rates by climate and barrel size.
Approximate formula accounting for ethanol-water volume contraction (~4%). P in proof (US) or use ABV directly.
Water = (V_start × (P_start/P_target − 1)) ÷ (1 − 0.04)Simplified linear approximation for moderate dilutions. More accurate for small batch craft bottling.
V_water = V_spirit × (ABV_start − ABV_target) ÷ ABV_targetFinal volume slightly less than sum due to contraction. Expect 2–4% less volume than arithmetic sum.
V_final = V_spirit + V_water (minus contraction)Updated: July 2026
750 ml at 125 proof diluted to 90 proof requires ~195 ml water. Final volume ~930 ml (contraction adjusted).
100L at 140 proof (70% ABV) to 80 proof (40% ABV): add ~75L water for standard bottling strength.
Cask strength 110 proof — calculate water to hit exactly 100 proof for consistent release across barrels.
Bottling spirits at target proof requires precise water addition calculation. Enter starting volume, current proof, and target proof to calculate water volume needed using the non-linear alcohol dilution formula that accounts for volume contraction.