For an adult office party of 10 to 25 people, plan on 2.5 to 3 slices per person depending on what else is on the table. That puts you at 4 large pizzas for 10 people and 8 large pizzas for 25.
Quick reference: pizzas to order by group size
Use this as your starting point and adjust for your office's eating habits. The numbers below assume 8-slice large pizzas, with pizza as the main course alongside light sides like a salad or chips.
| Group size | Light appetite | Average appetite | Hungry crowd | |---|---|---|---| | 10 people | 3 large | 4 large | 5 large | | 15 people | 4 large | 6 large | 7 large | | 20 people | 5 large | 7 large | 8 large | | 25 people | 7 large | 8 large | 10 large |
Light appetite means an afternoon party with cake, drinks, and a full snack table where pizza is one of several options. Average means pizza is the main thing being served. Hungry crowd is for end-of-quarter celebrations, retirement parties, or anything running into the evening where people skip dinner.
For exact numbers including a topping breakdown, run your group through our pizza party calculator and pick the appetite level that matches your event.
Office parties are different from routine work lunches
A regular Tuesday team lunch and a Friday afternoon office party look similar from a distance, but the eating dynamic is different. At a routine lunch with sides, people grab two slices and head back to their desks. At a party, people stand around longer, drink something, and graze. Two slices becomes three. That is why this guide leans toward higher per-person counts than a generic office lunch guide.
There is also a social dimension. Nobody wants to take the last slice when their boss is in the room. If you under-order by even one pizza, the last 10 minutes of the party will feel awkward. If you over-order, you have lunch tomorrow. Order one extra pie if you are on the fence.
For a deeper look at routine office lunches with the lower 2-slice baseline, see our guide on ordering pizza for the office.
How to handle dietary restrictions
Office parties pull together teams that do not normally eat lunch together. That makes dietary restrictions more visible than at a small team meal.
A simple rule: for any office party of 15 or more people, send a single message a day before asking about dietary restrictions. You do not need a survey. Just ask. The 30 seconds of effort is worth not having three people stand around the buffet with nothing to eat.
Common restrictions to plan for:
- Vegetarians. Plan for 10 to 15 percent of your headcount. For a 20-person party, that means at least one full veggie pizza, not just an extra cheese pie.
- Vegan colleagues. Most national chains now offer dairy-free cheese as an upcharge add-on. Call ahead and confirm before you order.
- Gluten-free guests. Most pizza chains offer a gluten-free crust at a small upcharge. These crusts share an oven with wheat, so they are not safe for someone with celiac disease. Ask about that specifically if it matters to anyone in your group.
Label the boxes. Stick a piece of tape on the lid and write what is inside. With 8 boxes stacked on the counter, this saves the dietary-restriction folks from opening every lid to find their option.
Drinks, sides, and what changes the math
A pizza-only party with no sides and no drinks pushes the per-person count up. Add 1 large pizza for every 8 people if you go that route. For 20 people with pizza only, that is 9 large pizzas instead of the 7 in the table above.
A pizza party with a full salad bar, chips, cookies, and beverages drops the count. Use the light appetite column. People graze across the table and pizza is one of several options.
Cake, dessert, or pastries pulls people away from a third slice. If you are also running a birthday or retirement cake, you can usually drop one large pizza from the average count.
Drinks influence things too. A party with beer or wine flowing tends to push pizza consumption up rather than down. People standing around with a drink in hand reach for more food. Plan toward the hungry column for parties running into the evening with alcohol on the table.
Topping mix for a mixed group
For a typical office party where you do not know everyone's preferences, this split works:
- 1 cheese pizza for every 8 people. Cheese is the safe default for picky eaters and for the colleague who showed up unexpectedly.
- 1 veggie or margherita pizza for every 6 people. Vegetarians eat this. So do meat-eaters. It is one of the most-requested toppings at offices.
- 1 pepperoni pizza for every 6 people. The default crowd-pleaser.
- 1 specialty pizza (sausage and onion, supreme, or BBQ chicken) for every 8 people if your group is bigger than 15.
Avoid polarizing toppings at office parties. Anchovies, blue cheese, and truffle oil are fine when you are ordering for yourself. For a group of 25 coworkers, stick to recognizable toppings.
Group size guides
For a deeper dive into a specific group size, see:
For more answers about ordering, see the pizza ordering FAQ.