Batching Cocktails: the Water You Forgot to Buy
Published 9/25/2026 · 3 min read · Everyday calculators
Marco Bianchi — Home, DIY & motoring writer at OneKitly
Renovation · Materials
Checked against 2 sources
Twenty-four servings at 120 ml each is 2,880 ml — 2.88 litres, or about 97 US fluid ounces, a little over four 700 ml bottles' worth of finished drink. The trap is that this is the volume that reaches the glass, and a cocktail made one at a time reaches its glass having picked up water from the ice it was stirred or shaken with. Skip that step for a batch and you have poured the same spirits into a smaller total volume: the drink is stronger, flatter and noticeably rougher than the one you tested. The fix is to add the water on purpose. Make one drink by your usual method, weigh the glass before and after straining, and the difference in grams is the millilitres of water your technique adds — multiply by 24 and buy it in advance, chilled.
24 servings of 120 ml is 2,880 ml, or 2.88 litres. That is the volume in the glass, not the volume of ingredients — and the gap between the two is the reason batched drinks taste harsh.
Serve the batch over ice and you dilute it twice
If the water has already been added, the glass should be cold rather than full of melting ice — a large single cube, or none at all for anything served straight up. The common failure at a party is a jug that was correctly diluted in the kitchen and then poured over four small cubes that keep working for twenty minutes, arriving at the bottom of the glass as something noticeably weaker than intended. Chilling the batch in the fridge for a few hours and using big ice, or none, keeps the drink where you built it.
Citrus is the ingredient that will not wait
Spirits, sugar and bitters keep for weeks in a sealed bottle in the fridge; fresh lemon and lime juice start to change within hours and taste cooked by the next day. Batch everything except the citrus, keep the juice separate and squeezed as late as you reasonably can, and combine at the last moment — it is one extra jug and it is the difference between a batch that tastes made and one that tastes stored. Anything built on shelf-stable ingredients alone can be mixed days ahead with no penalty at all.
| Quantity | Value |
|---|---|
| Total volume | 2,880 ml (97 fl oz) |
| In litres | 2.88 |
| 700 ml bottles of finished drink | 4.1 |
Worked with our own calculator
Cocktail batch calculator
Given
- Number of servings
- 10
- Volume per serving (ml)
- 120
Result
- Total volume (ml)
- 1,200
- Total volume (litres)
- 1.2
These figures are produced by the calculator below, not typed in by hand — they are recomputed whenever the tool changes.
Run it on your own figures →Frequently asked questions
- How many drinks should I plan per guest?
- The common planning figure is one in the first hour and one an hour after that, which for twenty-four servings means about eight guests over a long evening or twelve over a shorter one. What matters more than the average is the shape: the first hour empties a jug faster than any later hour, so a batch sized for the whole evening still runs out at the start if it is the only thing on the table. Have something non-alcoholic and something simple alongside, and the cocktail lasts as intended.
- Can I scale a recipe by simply multiplying?
- For the liquids, yes — spirits, juice and syrup scale linearly and a batch of twenty-four is just one drink times twenty-four. Two things do not: bitters and any strongly aromatic modifier, which are dosed by drops and become dominant faster than the volume suggests, and anything carbonated, which must be added to each glass rather than to the jug. Scale the base, taste the batch against a freshly made single, and adjust the small aromatic parts by tasting rather than by arithmetic.
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