Cocktail Dilution Calculator Formula

Understand the math behind the cocktail dilution calculator. Each variable explained with a worked example.

Use the Cocktail Dilution Calculator

Formulas Used

Water from Dilution

water_added = initial_volume * method / 100

Final Cocktail Volume

final_volume = initial_volume * (1 + method / 100)

Final ABV

final_abv = initial_abv * initial_volume / (initial_volume * (1 + method / 100))

Final Volume (mL)

final_ml = initial_volume * (1 + method / 100) * 29.57

Variables

VariableDescriptionDefault
initial_volumePre-Dilution Volume(oz)4
methodMixing Method25
initial_abvPre-Mix ABV(%)30
dilution_ozDerived value= initial_volume * method / 100calculated

How It Works

How to Calculate Cocktail Dilution

Formula

Water Added = Initial Volume x Dilution %

Final Volume = Initial Volume x (1 + Dilution %)

Final ABV = Initial ABV x Initial Volume / Final Volume

Dilution Percentages

  • Built/poured (no ice mixing): 5-15%. Ice melts slowly in the glass.
  • Stirred (30-45 seconds with ice): 20-30%. Chills efficiently with moderate dilution.
  • Shaken (10-15 seconds with ice): 30-40%. Introduces air and chills rapidly.

    • Dilution is essential to a balanced cocktail. It softens the alcohol burn and integrates flavors. Under-diluted cocktails taste harsh; over-diluted ones taste watery.

    Worked Example

    A stirred 4 oz cocktail with 30% ABV.

    initial_volume = 4method = 25initial_abv = 30
    1. 01Water added = 4 x 0.25 = 1 oz
    2. 02Final volume = 4 x 1.25 = 5 oz
    3. 03Final ABV = 30 x 4 / 5 = 24%
    4. 04The cocktail is 5 oz at 24% ABV after stirring.

    Frequently Asked Questions

    How long should I stir a cocktail?

    Stir for 30-45 seconds for spirit-forward drinks (Martini, Manhattan, Negroni). This achieves about 25% dilution and proper chilling. Taste and adjust; if it is too strong, stir a few seconds more.

    Why do shaken cocktails have more dilution?

    Shaking is more violent than stirring. Ice chips break off and melt faster, and the liquid contacts more ice surface area. This is desirable for cocktails with citrus or cream, which benefit from more dilution and aeration.

    Can I batch cocktails and account for dilution?

    Yes. For batched cocktails served without ice, add the equivalent dilution water directly to the batch. For a stirred cocktail, add 25% of the batch volume as water, then chill in the refrigerator.

    Ready to run the numbers?

    Open Cocktail Dilution Calculator