Alcohol Percentage Calculator
Know your liquor's proof and the strength you're aiming for? Enter the numbers and we'll tell you exactly how much simple syrup — water and sugar — to add to hit your target.
Your batch
Make a simple syrup from the water and sugar above, let it cool, then blend it into your infused, strained liquor to land on your target strength.
How the math works
The calculator conserves the pure alcohol already in your liquor and works out the syrup needed to dilute it to your desired final strength. It then splits that syrup into the water and sugar you'll actually measure out.
- Final volume (ml)
(Liquor × Alcohol%) ÷ Desired% - Simple syrup to add (ml)
Final volume − Liquor - Water (ml)
Syrup × 0.74 - Sugar (g)
(Syrup − Water) × 2
Corrected from the original LimoncelloQuest spreadsheet, which mislabeled final batch volume as syrup to add. Results are practical estimates because dissolved sugar and volume contraction can shift the finished volume slightly. Need to keep a bottle from freezing solid in the freezer? Try the Alcohol Freezing Point Calculator →