Ordering food for a group is its own kind of stressful. Order too little and half the room is still hungry an hour later. Order too much and you’re eating cold leftovers for three days. Most people just guess, and most guesses are wrong in one direction or the other.
Here’s the actual math behind ordering pizza and Mexican food for a crowd, plus how our real combo deals make it easier to get the quantity right the first time.
None of this requires guesswork. The pizza industry has settled on a few reliable rules of thumb over the years precisely because feeding groups is such a common problem, and those same rules work just as well for a family gathering as they do for an office lunch.
How Many Slices Does the Average Person Actually Eat?
As a baseline, adults typically eat about two to three slices of pizza at a sitting, while kids under 10 tend to eat closer to one and a half. Those numbers shift depending on timing — a pizza order that lands right at dinnertime gets eaten more heavily than one served as a mid-afternoon snack alongside other food.
If you’re also serving sides, chips, or a second dish alongside the pizza, people naturally eat a bit less of it. A pizza-only spread, on the other hand, tends to push everyone toward the higher end of that range.
The Simple Math: How Many Pizzas to Order
A widely used shortcut in the pizza industry is what’s sometimes called the 3/8 rule: plan for about three-eighths of a pizza per person, assuming a standard large pizza cut into eight slices. In practice, that works out to roughly three slices per adult guest.
The formula is simple: multiply your guest count by three, then divide by eight, and round up. Twenty guests works out to 7.5 pizzas — round up to eight. The Omni Calculator’s pizza party tool walks through the same math in more detail if you want to plug in your own numbers.
Rounding up rather than down is the safer habit here. An extra half-pizza of leftovers costs you almost nothing, while running short mid-meal means someone’s ordering backup delivery from somewhere else — a worse outcome for everyone, including the original order.
Pizza Quantity by Group Size
| Group Size | Large Pizzas Needed | Total Slices |
|---|---|---|
| 5 people | 2 | 16 |
| 10 people | 4 | 32 |
| 15 people | 6 | 48 |
| 20 people | 8 | 64 |
| 30 people | 12 | 96 |
This table assumes an average appetite and a mixed group of adults and kids. If you know your crowd skews toward bigger eaters, or you’re feeding people at peak dinnertime, round up by one extra pizza per every 10 guests to stay safe.
Mix Flavors Instead of Ordering One Giant Order
For groups larger than five or six people, splitting the order across two or three different pizzas almost always works out better than one massive order of a single type. It covers more preferences without anyone having to negotiate, and it’s honestly more fun to have options on the table.
A reasonable split for a mixed group: one Plain Pizza for anyone who wants the basics, one Meat Lovers Pizza for the bigger appetites, and one White Ricotta Cheese Pizza if you want something different from the usual red-sauce lineup.
Made-to-order matters more at group volume too. A single pie loses very little quality between the first slice and the last, but a larger order sitting around waiting for everyone to grab a plate benefits from a crust sturdy enough to still taste right after a few minutes — another reason a reliable, foldable crust style holds up better for group orders than something delicate meant to be eaten the second it leaves the oven.
Don’t Forget the Mexican Side of the Menu
If part of your group would rather eat tacos than pizza, that’s an easy problem to solve without splitting into two separate orders. Nachos are naturally built for sharing — one large order comfortably covers four to six people as a starter — and a mix of tacos and burritos lets everyone build their own plate instead of committing to one dish.
If you want a deeper breakdown of how those dishes actually differ before you order, our guide to tacos vs. burritos vs. quesadillas vs. tortas covers exactly that.
Our Specials Make Group Ordering Easier
We built our combo specials specifically around group-sized ordering, so you don’t have to do all this math yourself every time. Special #02 gets you two large plain pizzas plus a 2-liter soda for $21.95 — a straightforward option that comfortably covers a group of 8-10 on its own.
For bigger gatherings, our loaded combo specials bundle in extra sides and a larger soda, so you’re covering pizza, extras, and drinks in a single order instead of piecing it together item by item.
The advantage of ordering a combo instead of building your own from scratch is mostly about convenience: one order, one price, one delivery, instead of piecing together pizzas, sides, and drinks as separate line items. If you’re already doing the math on a group order, it’s worth checking whether one of our specials covers what you need before building the order from scratch.
Drinks Are Easy to Underestimate
Food gets most of the planning attention, but drinks run out just as fast at a group order, especially if it’s warm out or the food is on the spicier side. Plan for at least one drink per person, and lean toward having a few extra on hand rather than running short mid-meal.
We carry canned soda, bottled water, and Gatorade alongside the food menu, so you can round out a group order without needing a separate stop.
It’s worth mixing drink types rather than ordering one kind for the whole group. Soda covers the classic pairing, water covers anyone who’d rather skip the sugar, and Gatorade is worth having on hand if the gathering includes kids’ sports teams or anyone who’s been active outdoors before the food arrives.
A Few More Tips for Ordering for a Crowd
- Order ahead when you can. A large order needs more prep time than a single pizza, especially around peak dinner hours.
- Confirm your headcount close to order time. RSVPs shift, and it’s easier to add one more item than to guess high from the start.
- Ask about combining pizza and Mexican food in one delivery. Everything comes from the same kitchen, so there’s no need for two separate orders.
- Check your delivery coverage before you commit to a headcount. Our Frankford Ave delivery zip codes cover a specific area, worth confirming before you finalize plans.
Frequently Asked Questions
- How many pizzas do I need for 15 people?
- Around six large pizzas, using the standard three-slices-per-person estimate. Round up slightly if the group skews toward bigger appetites.
- Should I order one giant pizza order or split it into different types?
- For groups over five or six people, splitting across two or three different pizzas usually works better, since it covers more preferences without anyone compromising.
- Can I order both pizza and Mexican food for the same group?
- Yes. Everything is made in the same kitchen, so you can combine pizza, tacos, burritos, and nachos into one order and one delivery.
- Are your combo specials good for group orders?
- Yes — Special #02 alone covers a group of 8-10 with two large pizzas and a 2-liter soda, and our larger combos add more food for bigger gatherings.
- How many drinks should I order for a group?
- Plan for at least one drink per person, with a few extras on hand, especially if the food includes anything spicy.
Feeding a crowd? Let us handle the math.