Ask any caterer what home hosts under-buy most and the answer is instant: ice. It does two jobs (chilling drinks, holding cold food) while constantly dying, and the reliable rule is 1–1.5 pounds per guest — with the drinks-cooling split explained.
Where the ice goes
| Job | Share | Note |
|---|---|---|
| Drink glasses | ~50% | Every cold drink carries 4–6 oz of ice |
| Coolers & ice buckets | ~35% | Beer/wine coolers re-fill constantly |
| Food platters & safety | ~15% | Cold foods sit on ice — the health department insists |
The math
Twelve guests × 1.5 lb = 18 pounds — two 10-lb bags, minimum. Cocktail-heavy parties (every drink iced) push toward 2 lb/guest; dinner parties with wine lean lower. The grocery bag count is the honest unit: when in doubt, one more bag. Melted ice is cheap; warm drinks and warm mayo are not.
The logistics that keep it frozen
- Buy same-day — bagged ice loses a third of itself in a car trunk hour.
- Coolers with drains: melted water accelerates melting for the ice floating in it — drain or use two coolers.
- Big blocks last longer: frozen water bottles chill without diluting and become tomorrow's ice packs.
- The backup plan: know which gas station still sells ice at 9 pm — every host needs the map.
The food calculator totals ice with everything else, and the shopping list stops forgetting the item that touches every drink, every platter, and every cooler. One and a half pounds. Per guest. Write it on the list.