Alcohol Dilution Calculator
Safely dilute high-proof alcohol to your target strength using proven C1V1 = C2V2 calculations.
Enter the alcohol percentage of the high-proof spirit.
Must be lower than the starting ABV.
High-proof spirit needed
0.667 liters
667 ml
Water/addition volume
0.333 liters
333 ml
Final batch volume
1.000 liters
1000 ml total
How to Use This Calculator
Measure the starting ABV
Check the label or use a hydrometer to determine the alcohol percentage of the spirit you plan to dilute.
Set your target strength and volume
Define the final ABV you want to achieve and how much product you need.
Mix precisely and verify
Combine the measured spirit and water. Stir thoroughly and optionally recheck ABV for compliance.
Formula
C1 × V1 = C2 × V2
Required high-proof volume = (C2 ÷ C1) × V2
Water volume = V2 - V1
Example: Dilute 60% ABV spirit to 40% for 2 L final volume → Spirit needed = (40 ÷ 60) × 2000 ml = 1333 ml → Water needed = 667 ml.
Tip: For proof values, remember proof = ABV × 2. Always convert to ABV before calculation.
Full Description
Distillers, bartenders, and herbalists often dilute high-proof alcohol to achieve a consistent, safe drinking strength. Using the C1V1 = C2V2 equation ensures you add the right amount of water (or juice, syrups, etc.) without trial and error. This calculator handles the math and presents results in both metric and U.S. customary units.
Enter the starting ABV, your target ABV, and the final batch size. The tool outputs how much concentrated spirit and how much dilution liquid you need. Stir or shake thoroughly to ensure even distribution before bottling or serving.
Common uses
- Proofing down spirits for bottling or cocktail batching.
- Adjusting tincture strengths for herbal preparations.
- Reducing alcohol content for safe shipping or compliance.
- Creating large batches of liqueurs with consistent ABV.
Always use accurate measuring tools and consider temperature—volumes expand slightly with heat. For legal or commercial purposes, verify final ABV with a calibrated hydrometer or densitometer.
Frequently Asked Questions
Can I use proof instead of ABV?
Yes—convert proof to ABV by dividing by 2, then enter the values into the calculator.
Does temperature matter?
Warm liquids expand slightly, affecting volume. For the most accurate results, measure at room temperature (20°C / 68°F).
Can I dilute with fruit juice instead of water?
Absolutely. The math is the same. Just be aware juices add sugar and may ferment if not refrigerated.
How do I scale up batches?
Double or triple the final volume—this calculator scales proportionally, so your ratios stay accurate.