Alcohol Dilution Calculator
Calculate how much water to add to dilute spirits to your desired strength.
Water to Add
0 ml
Final Volume
0 ml
Final Strength
0% ABV
Pure Alcohol Content
0 ml
Conversion Reference
Starting
0% ABV = 0 Proof
Target
0% ABV = 0 Proof
Common Dilutions
Cask strength → Bottling
60% → 40%
Navy strength → Standard
57% → 40%
Overproof → Cocktail
75.5% → 40%
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Dilution Guide
ABV vs Proof:
- ABV (Alcohol By Volume) = percentage of alcohol
- US Proof = ABV × 2 (e.g., 40% ABV = 80 Proof)
- UK Proof (historical) = ABV × 1.75
Why Dilute Spirits?
- Cask strength whisky often needs dilution for tasting
- Homemade infusions may need adjustment
- Cocktail preparation
- Achieving preferred drinking strength
Tips for Dilution:
- Use distilled or filtered water
- Add water slowly and stir gently
- Let rest after dilution (louching may occur)
- Temperature affects density - measure at room temp
- The math is approximate due to volume contraction
Common Spirit Strengths:
- Standard spirits: 40% (80 proof)
- Navy strength gin: 57% (114 proof)
- Cask strength whisky: 50-65%
- Overproof rum: 63-75.5%
- Everclear: 75.5-95%