Party food calculator

How many pizzas, drinks, and bags of ice to buy. Enter your guests; the answers update as you type.

How it works

• Pizza: 2 slices per child and 3 per adult (1.5 for kids 5 and under), 8 slices to a large pizza, rounded up.
• Plates, cups, napkins: 2 plates, 2.5 cups and 3 napkins per guest, counted separately.
• Kids' drinks: juice boxes, pouches or lemonade, 1 per kid an hour. Kids' parties are planned at 2 hours.
• Grown-ups' drinks: 2 in the first hour, then 1 for each hour after (soda, sparkling water, beer or wine).
• Water: counted on its own, 8 oz per kid an hour and half that per adult; add half again on a hot day. A gallon fills 16 small cups.
• Ice: about 2 lb per guest. Double it on a hot day (85°F or more) or outdoors in the heat, and keep one bag just for drinks.
• Cake: one serving per guest, adults and siblings included. Up to 12 servings is an 8-inch round or a dozen cupcakes, up to 24 a quarter sheet, up to 48 a half sheet.
• Snacks at kids' parties: about 1 cup of fruit or veggies per guest, plus about 3 oz of chips per kid.
• Grown-up parties: about 1 lb of food per guest (half for kids). Seats depend on the party: about 90% of guests at a baby shower, 45% at a graduation open house, and 60% at an adult birthday or house party.

Only know the total? Festidy assumes about 6 in 10 guests at a kids' party are kids.