Graduation party food calculator
For an open house where guests come and go, about 45% of your guest list is there at once. Plan about 1/2 pound of food a guest for finger foods, or 1 pound for a full meal.
Festidy's graduation plan counts food, drinks and cake from your RSVPs and adds the open house to your checklist.
Make my party planHow we calculate
- Who is there at once: the planner's rule for a graduation open house, that about 45% of guests are in the room at the same time because they come and go. It sets the number of chairs, drinks and ice. Rounded up.
- Food: the planner counts about 1 pound of food a guest for a meal. A full meal here is that 1 pound for every guest on the list. Finger foods and snacks are half of that (1/2 pound). Desserts and drinks only is a quarter (1/4 pound). The half and quarter are rules of thumb.
- Long open houses: add 10% for each hour past 3 (up to 6 hours), because guests who stay longer graze more. A rule of thumb.
- Sample menu split: a rule of thumb, not a planner number. Finger foods: mains 30%, sides 20%, snacks 30%, dessert 20%. A full meal: mains 45%, sides 30%, snacks 10%, dessert 15%. Desserts only: snacks 25%, dessert 75%. Cake is counted on top of this, below.
- Cake or cupcakes: one serving per guest, the planner's rule. 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, and one more half sheet for each 48 after that.
- Drinks and ice: the planner's rules for the guests there at once, over the whole open house: 2 drinks each the first hour and 1 an hour after, 4 oz of water a guest an hour (half again on a hot day), 8 oz bottles, and 2 pounds of ice a guest (doubled on a hot day). The drinks and ice calculator does the same with kids and a party length of your own.
- Plates, cups and napkins: the planner's 2 plates, 2.5 cups and 3 napkins a guest, counted on the full guest list. Desserts only needs one small plate each, so we halve the plates. The plates, cups and napkins calculator turns this into packs.
- Food safety: perishable food should not sit out more than 2 hours, or 1 hour if it is above 90°F (UC Master Food Preservers, from FoodSafety.gov), unless you keep it hot or cold.
Last updated October 21, 2026. Free, no sign-up.
Tips for feeding an open house
- Refill in waves. Put out half the food and keep the rest chilled or warm. Refill at the halfway mark so nothing sits out for more than 2 hours (1 hour on a hot day).
- Choose food that holds. Sliders, skewers, pasta salad and sheet-pan dishes stay good on a table. Skip anything that wilts or melts in an hour.
- Set a cake time. Say "cake at 2 pm" on the invitation. Guests who come and go will catch it, and you get one photo with everyone.
- Keep drinks away from the food. A second table stops lines from mixing. A big cooler of ice and a drink dispenser save you from refilling.
- Label dishes with common allergens. Festidy's RSVP asks guests for allergies, so you know before you cook. Offer halved grapes and pretzels instead of whole grapes, popcorn and nuts, which are choking risks for the little siblings who come.
Questions
How much food do I need for a graduation party?
About 1/2 pound a guest for finger foods and snacks, or 1 pound a guest for a full meal. For 60 guests over 3 hours, that is about 30 pounds of finger foods or 60 pounds for a meal.
How many guests will be at my graduation party at the same time?
About 45% of your list at once, in Festidy's plan for an open house, because guests drop in and leave. For 60 guests, plan the seats, drinks and ice for 27 people.
How much food for 100 people at a graduation party?
About 50 pounds of finger foods or snacks, or 100 pounds for a full meal, for a 3 hour open house. Add 10% for each extra hour up to 6 hours.
How long should a graduation open house last?
3 hours is Festidy's default for a graduation party, and guests usually stay for a part of it. A longer open house needs more food and more refills, but not more guests at once.
How much cake do I need for a graduation party?
One serving a guest: a half sheet cake for 25 to 48 guests, or 5 dozen cupcakes for 60. Open houses often have cake at a set time, so everyone is there for it.
What should I serve at a graduation open house?
Finger foods that hold up on a table: sliders, skewers, pasta salad, a veggie tray, chips and dip, plus cookies and cake. For a longer open house or one that runs through lunch or dinner, add a hot main like a taco bar or pulled pork.