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Alcohol Dilution Calculator.

Calculate spirit and diluent volumes for a target ABV.

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Set your values

Results update as you type.

Spirit volume: 250 mL

Spirit volume

250.0000mL
Diluent volume: 250 mL

Diluent volume

250.0000mL

Results update automatically as you type.

Use Cases

Home distilling and blending

When you have a high-proof distillate and need to bring it down to a specific bottling strength, this calculator tells you exactly how much water to add.

Example: Dilute 1 liter of 95% ABV neutral spirit to 40% ABV for a vodka-style product.

Cocktail and liqueur preparation

For making homemade liqueurs or adjusting the proof of a cocktail base, this tool helps you hit the desired alcohol content precisely.

Example: Reduce a 60% ABV herbal infusion to 30% ABV for a balanced liqueur.

Frequently Asked Questions

How does the alcohol dilution calculator work?
It uses the formula: (Starting ABV × Spirit Volume) = (Target ABV × Final Volume). Given your starting ABV, target ABV, and desired final volume, it calculates the required spirit volume and the amount of diluent (e.g., water) to add.
What units does the calculator use?
The calculator uses percentages (%) for both starting and target ABV, and milliliters (mL) for the final volume. The results for spirit and diluent volumes are also in mL.
Can I use this calculator for any type of alcohol?
Yes, it works for any distilled spirit or alcohol solution as long as you know the starting ABV and the target ABV you want to achieve. It assumes that the diluent contains no alcohol (e.g., water).

Tips & Common Mistakes

Tips

  • Always measure your starting ABV accurately, as small errors can significantly affect the final concentration.
  • When adding diluent, do it gradually and mix well, then re-measure the ABV if possible.
  • Use distilled or filtered water to avoid introducing impurities that might affect taste or clarity.
  • Remember that the final volume is the sum of spirit and diluent volumes; the calculator accounts for this.

Common Mistakes to Avoid

  • Assuming that adding a certain volume of water will simply reduce the ABV proportionally without considering the final total volume.
  • Using the calculator with mismatched units, such as entering final volume in liters while expecting results in milliliters.
  • Forgetting that the diluent volume is the difference between the final volume and the spirit volume, not an arbitrary amount.

Last updated: August 13, 2026