Calculate how much water to add so a spirit reaches the alcohol strength you want.
| Water to add | – |
| Final volume | – |
Use this calculator when you are cutting vodka for a punch, making a liqueur, or bringing a high-proof bottle down to sipping strength.
Alcohol is conserved: spirit volume × its ABV = final volume × target ABV. Water to add is the extra volume. The mix is treated as volumes you measure in a jug; it ignores the small contraction when ethanol and water mix, which is acceptable in a kitchen and is not how a distillery gauges.
Spirit volume: How much spirit you have. Enter millilitres or fluid ounces; the result uses the same volume system.
Spirit ABV (%): The bottle’s alcohol by volume, as a percent. Type 40 for 40% / 80 proof.
Target ABV (%): The strength you want after adding water. It must be lower than the spirit and greater than zero. Type 20 for a long drink.
Water to add: Volume of water to mix in.
Final volume: Total volume after dilution.
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