Cocktail Batch Scaler

How this is calculated

⚠️ DILUTION IS THE WHOLE REASON BATCHING GOES WRONG. A cocktail stirred or shaken with ice is not the recipe - it is the recipe plus the water that melted into it, and that water is typically a fifth to a third of the finished drink. Batch the recipe without it and you have made something noticeably stronger, harsher and less balanced than the drink you tested. Adding the water deliberately is what lets a batch taste like the single serve. DILUTION HERE IS A PERCENTAGE OF THE UNDILUTED MIX, not of the finished volume. So 100 ml of ingredients at 22% dilution means adding 22 ml of water for a finished 122 ml. Both conventions exist in the wild, which is exactly why this one is stated plainly rather than assumed. ⚠️ THE RIGHT DILUTION FIGURE IS AN INPUT, BECAUSE IT DEPENDS ON YOUR TECHNIQUE. It moves with how long you stir, how cold and how large your ice is, and whether the drink is stirred or shaken - shaking generally picks up more water than stirring. Published figures for the same drink disagree, so no single number would be honest here. THE RELIABLE WAY TO FIND YOURS: make the drink the way you normally do, pour it into a measuring cylinder or onto a scale, and compare the finished volume with what you put in. The difference is your dilution, measured in your own bar with your own ice, and it beats any figure a website could give you. BATCH WITHOUT THE CITRUS IF YOU ARE MAKING IT AHEAD. Fresh citrus juice starts losing its character within hours and is noticeably different the next day. A batch that will sit overnight is best made with the spirits and sweeteners only, with the juice added shortly before serving. The tool gives you the citrus total separately for that reason. THE FINISHED STRENGTH IS WORTH KNOWING BEFORE YOU SERVE A ROOM. It is calculated as the alcohol from each ingredient divided by the finished volume including the dilution water. A typical spirit-forward drink lands somewhere in the low twenties by volume - stronger than wine, several times a beer, and served in a small glass that does not look like either. If you are hosting, that number is a more useful guide to how the evening goes than the number of bottles you bought. EVERYTHING IS IN MILLILITRES, on purpose. Cocktail recipes written in ounces, parts, jiggers and dashes are the main reason batching arithmetic goes wrong. Convert once at the start and stay in one unit. One US fluid ounce is 29.5735 ml, and a standard 750 ml bottle is 25.4 US fluid ounces. THE BOTTLE COUNT IS A ROUGH SHOPPING FIGURE. It assumes 750 ml bottles and ignores what stays in the bottle, the measure and the funnel, so round up rather than buying exactly what it says.

Common questions

Why do I need to add water?

Because a cocktail stirred or shaken with ice is not the recipe - it is the recipe plus the water that melted into it while you were making it. That water is usually somewhere between a fifth and a third of the finished drink, and it is doing real work: it softens the alcohol, opens up the aromatics and brings the whole thing into balance. Batch the ingredients without it and you have made something stronger and harsher than the drink you actually tested. Adding it deliberately is the single step that makes a batch taste like a single serve.

How do I find my own dilution figure?

Measure it, which takes one drink and beats any published number. Make the cocktail exactly the way you normally do - same ice, same stirring or shaking time - then strain it into a measuring cylinder or onto a scale and compare the finished volume with the total that went in. The difference is your dilution. It is worth doing because the figure moves with how cold and how large your ice is and how long you work the drink, which is why published figures for the same cocktail disagree with each other and why this tool asks rather than assumes.

Is dilution a percentage of the recipe or of the final drink?

Of the recipe - the undiluted mix - in this tool. So 100 ml of ingredients at 22% dilution means adding 22 ml of water for a finished volume of 122 ml. Both conventions genuinely exist in bar writing, and mixing them up gives you an error of a few percent in the direction of a weaker drink. If you measured your own dilution by comparing what went in against what came out, the figure you got is the same convention this tool uses.

Should I batch the citrus too?

Not if the batch is being made more than a few hours ahead. Fresh citrus juice starts losing its brightness within hours and tastes noticeably duller the next day - it is the one ingredient that genuinely does not keep. The usual approach is to batch the spirits, fortified wines and sweeteners, which are stable, and add the juice shortly before serving. That is why this tool reports the juice and syrup total as its own line rather than folding it into the batch figure.

Why does the finished strength matter?

Because a spirit-forward cocktail typically lands somewhere in the low twenties by volume, which is roughly twice the strength of wine and several times that of beer, and it arrives in a small glass that looks like neither. When you are serving a room rather than making one drink, that number is a far better guide to how the evening will go than counting bottles. It is also the figure to think about if you are batching something to be poured over more ice at the point of service, since that will dilute it further.

Can I use ounces or parts instead?

Convert to millilitres first, and stay there. Recipes written in ounces, parts, jiggers and dashes are the main reason batching arithmetic goes wrong - the units get mixed halfway through and nobody notices until the batch is made. One US fluid ounce is 29.5735 ml, and a standard 750 ml bottle is 25.4 US fluid ounces. Convert once at the start, do everything in one unit, and convert back at the end only if you want to.

How accurate is the bottle count?

It is a shopping figure and deliberately rough. It assumes 750 ml bottles and ignores what stays behind in the bottle, the measure, the funnel and the mixing vessel, all of which add up over a large batch. Round it up. Running a few millilitres short on a batch you are making for a party is a far more annoying problem than having a little left in the bottle.

Take it further with AI

Copy this into ChatGPT or Claude with your own numbers filled in. It hands over the figures this calculator worked out, so the answer is built on real arithmetic instead of a guess.

I used the Cocktail Batch Scaler at https://www.bfcbrilliance.com/tools/cocktail-batch-scaler.

What I entered:
- Base spirit per drink (ml): ___
- Base spirit strength (%): ___
- Fortified or liqueur modifier per drink (ml): ___
- Modifier strength (%): ___
- Juice, syrup and other non-alcoholic per drink (ml): ___
- Dilution (%): ___
- How many drinks (drinks): ___

What it calculated:
- Total finished batch: ___
- Base spirit: ___
- Modifier: ___
- Juice and syrup: ___
- Water to add: ___

Use those figures as given — they are already worked out, so please don't recalculate or estimate your own. Help me turn them into a plan: what to buy or do, in what order, roughly what it should cost, and the mistakes people most often make with this job.

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