Ice for a Party Calculator

How it works

Glass ice ≈ guests × (0.1–0.45 lb/h by drink style) × hours (max 6) × weather factor; chilling ≈ 0.55 lb per can + 0.1 lb/can/h of melt beyond 3 h; food coolers ≈ 12 lb each per 4 h; +15% margin

Running out of ice is the classic party failure, and the amount needed depends on far more than the guest count. Ice in glasses is modest — a pound per person covers a few hours of indoor drinks — but chilling warm cans and bottles takes about half a pound of ice each, and on a hot afternoon coolers can lose a quarter of their ice every hour. Food that must stay below 5 °C needs its own coolers and its own ice, never the drinks ice. The classic “one pound per person” rule holds only for short indoor gatherings; long, hot, outdoor events with cocktails run to two or three pounds each. Buy in stages if a shop is nearby, since leftover ice is wasted and melting ice in hot weather is money poured on the lawn.

Worked example

40 guests for four hours outdoors on a warm day with mixed drinks, 150 cans to chill and one food cooler: about 46 lb of glass ice, 116 lb for the cans and 14 lb for food — roughly 200 lb (92 kg) with margin, 21 bags of 10 lb, or 5 lb per guest.

Frequently asked questions