How to Scale a Cocktail Recipe
Scaling a cocktail looks simple — multiply every ingredient by the same factor — but in practice there are at least four different ways to think about it, and picking the right one changes the drink. Here's how to choose.
1. Simple multiplier — when you know how many you need
If you just need 10 Negronis, multiply every ingredient by 10. This is the baseline. It works perfectly for stirred spirit-forward drinks where the ratio is the recipe.
The catch: you lose dilution. A single stirred Negroni picks up around 20–25% dilution from ice in the mixing glass. A pre-batched Negroni served over ice only picks up what the ice in the glass provides. Always add water to the batch to compensate — typically 20% of the final volume.
2. Scale by servings — when the recipe is single and you want many
Single-serving recipes assume 1. If the recipe yields 1 drink and you want 30, the multiplier is just 30. Use this mode when you're batching a spec you've already dialed in.
Watch for ingredients measured in "to taste" terms (dashes of bitters, a rinse of absinthe). These don't scale linearly — at 30× a dash becomes 30 dashes, which is roughly 3 tsp. Fine. But at 300× it's overwhelming. At real volume, switch dashes to a known quantity.
3. Scale by bottle fill — when you're batching into a specific container
You have an empty 750ml wine bottle and want to fill it with a Boulevardier. Scale-by-bottle-fill works backwards: given the total volume and the recipe ratio, it tells you how much of each ingredient to add. Add water last for dilution.
This is the bartender's workhorse mode for service. Label the bottle with the spec (gin:Campari:vermouth:water) and the dilution percentage.
4. Scale by single ingredient — when one thing is the limiting factor
You have exactly 375ml of house syrup left and want to use all of it. Scale-by-single-ingredient takes one ingredient and its amount as the anchor, then calculates everything else.
Useful when a house-made component is the bottleneck: infused spirits, custom syrups, a single citrus fruit's worth of juice.
5. Unit conversion matters
US recipes are often in oz, UK and EU in ml. 1 oz = 29.57 ml. A "jigger" is 1.5 oz in the US, 25ml or 50ml in the UK.
Don't round too early. 0.75 oz × 20 = 15 oz, not 15.something. But 0.75 oz ≈ 22.18 ml, and 22 × 20 = 440 ml, while the actual answer is 443.6 ml. At scale, that 4 ml becomes a real difference.
BarCheat does all five of these automatically. Pick a mode, punch in the target, and get exact ingredient amounts in any unit — including added water for dilution.
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