[ datamaker ]

Drinks Calculator

How much to pour, and whether your stock covers it.

Statistical check · normal approximation

Section 01

The party

Guests

Starts at

Hours

Alcoholic share (%)

Crowd spread

Alcoholic share — of every 100 glasses poured, how many contain alcohol. At 70%, seven in ten glasses are beer or wine and three in ten are soda, water or coffee. It splits the same total demand in two; it does not change the total.
Crowd spread — how unequal your guests are. It widens the uncertainty, not the expected amount: a mixed crowd needs a bigger buffer for the same certainty.

Section 02

Guests present and pace, per hour

Both columns are editable. The presets only rewrite the pace column — your attendance figures stay as they are.

Hour	Present (%)	Drinks / guest / hour	Expected
Total

Standard is the common event-planning norm. Slow suits a dinner or an afternoon reception; fast suits a late-night crowd that came to drink.

Section 03

Demand per hour

One colour, two levels via opacity

Alcoholic Non-alcoholic

Alcoholic α 1.0, non-alcoholic α 0.35 — hierarchy by opacity, not by extra colours. Labelled directly on the bar, no gridlines. Tap or hover a bar for the split.

Section 04

Stock

Portions per liter = 1 ÷ glass size. Beer 0.25 L → 4 · wine 0.15 L → 6.7 · soft drink 0.2 L → 5 · spirits 0.035 L → 28.

Drink	Type	Liters	Portions / L	Portions
Alcoholic portions
Non-alcoholic portions

Section 05