How do I calculate bottles for a cocktail batch?
Multiply the pour by servings, divide each ingredient total by its bottle size, and round the purchase quantity up ingredient by ingredient.
Short answer
Calculate bottles separately for every spirit or liqueur: bottles required = servings × millilitres per serving ÷ millilitres per bottle. Round the purchase result up to a whole bottle. For 60 cocktails using 45 ml gin, you need 2,700 ml. Dividing by a 700 ml bottle gives 3.86, so buy four bottles. Those bottles contain 2,800 ml, leaving 100 ml before any other use or practical allowance. Do not add different products into one combined spirit volume, and do not pour every purchased bottle into the batch unless the recipe actually needs it.
Calculate the liquid requirement first
Start with the servings assigned to one recipe, not the total number of guests. If 100 guests have three alcoholic choices, they will not all order the same cocktail. Establish the likely recipe share, then multiply that recipe's spirit pour by its own planned servings.
Keep the result in millilitres. Sixty servings at 45 ml need 2,700 ml; sixty servings at 20 ml need 1,200 ml. Write every ingredient on a separate row. This prevents a primary spirit from being confused with a smaller liqueur pour that happens to use the same bottle format.
Divide by the actual bottle size
Use the volume printed for the product you will buy. A 700 ml bottle and a 750 ml bottle do not yield the same number of pours. At 40 ml, 700 ml provides 17.5 theoretical servings and 750 ml provides 18.75. Purchase calculations must still round to whole bottles.
For a quick yield check, use bottle volume ÷ pour size. The decimal shows theoretical capacity, not a reason to promise a fractional final drink. Measuring accuracy, tasting, spills, and use in other recipes can reduce what remains. Keep purchase rounding and the measured batch amount as two different numbers.
- Recipe need: servings × pour in ml.
- Bottle need: recipe millilitres ÷ bottle millilitres.
- Purchase: round the bottle need up to a whole bottle.
- Batch: measure the recipe need, not the full purchase volume.
Handle several ingredients and recipes separately
A cocktail with 50 ml tequila and 20 ml orange liqueur needs two bottle calculations. For 50 servings, that is 2,500 ml tequila and 1,000 ml liqueur. With 700 ml bottles, the shopping list needs four tequila bottles and two liqueur bottles. Six mixed bottles would not describe the stock correctly.
When two cocktails share the exact same product, add that product's millilitres across both recipes before dividing by the bottle size. If 70 drinks use 40 ml vodka and 30 drinks use 30 ml of the same vodka, the combined need is 3,700 ml. At 700 ml, that means six bottles.
Add a controlled practical allowance
Rounding to whole bottles already creates some spare volume. Calculate that remainder before adding another percentage. Four 700 ml bottles for a 2,700 ml need already leave 100 ml, equal to more than two 40 ml pours. A large extra buffer may therefore be unnecessary for that ingredient.
Consider whether sealed surplus can be reused or returned, whether the same spirit appears elsewhere on the menu, and whether replacement stock is nearby. Keep reserve bottles sealed until needed. The final prep sheet should show required millilitres, bottles purchased, millilitres placed in each batch, and unopened backup.
Planning examples
60 gin cocktails at 45 ml
The recipe needs 60 × 45 ml = 2,700 ml gin. With 700 ml bottles, 2,700 ÷ 700 = 3.86, so the purchase quantity is four bottles. Measure 2,700 ml for the planned drinks; the remaining 100 ml is visible reserve.
50 cocktails with two bottled ingredients
At 50 ml tequila and 20 ml liqueur, the batch needs 2,500 ml and 1,000 ml. In 700 ml formats, buy four tequila bottles and two liqueur bottles. Calculate juice, syrup, water, garnish, and ice on separate lines.
One shared spirit across two recipes
Seventy drinks use 40 ml vodka and thirty use 30 ml of the same vodka. The need is 2,800 + 900 = 3,700 ml. Divided by 700 ml, that is 5.29 bottles, so six bottles cover both recipes before any other use.
Next step
Put the cocktail count into your complete event plan
Brorano estimates total cocktail servings as part of the event, the category mix, in-glass ice, shopping categories and generic package quantities, and a rough cost range. It does not multiply a named recipe or calculate batch dilution, so keep the recipe calculation from this guide.
Frequently asked questions
How many 40 ml cocktails come from a 700 ml bottle?
The theoretical yield is 700 ÷ 40 = 17.5, so it contains seventeen full 40 ml pours plus 20 ml. For a purchase plan, multiply the total recipe demand first and round bottles up; do not build a large event plan solely from theoretical single-bottle yield.
Should I include a ten percent bottle reserve?
Check the remainder created by whole-bottle rounding before adding another buffer. The sensible allowance depends on menu overlap, measuring, access to replacement stock, and whether sealed surplus is reusable or returnable. Avoid automatically padding every expensive ingredient equally.
Can I add all spirits together before dividing by bottle size?
Only add millilitres when they refer to the exact same product. Gin and liqueur remain separate even if both use 700 ml bottles. Combining unlike ingredients produces the right total liquid volume but the wrong shopping list.
Does Brorano tell me which spirit bottles a named batch needs?
No. Use this ingredient-by-ingredient formula for the named recipe. Brorano estimates generic spirit and mixer packages from the event-level cocktail count, alongside the wider category mix, in-glass ice, and rough cost range.