How Many Pizzas Do You Need for 20 People? Tips and Examples

If you’re planning a party or gathering for 20 people, one of the main concerns is often how much food to order. Pizza is a popular choice for events like this – it’s easy to order, everyone loves it, and there are plenty of topping options to suit different tastes. However, figuring out how many pizzas to order can be a bit tricky. You don’t want to run out of food and leave your guests hungry, but you also don’t want to order too much and end up with a bunch of leftovers. In this post, we’ll help you figure out exactly how many pizzas you need for 20 people. We’ll take into account factors like appetite, pizza size, and toppings, and provide some real-life scenarios and recommendations to ensure your pizza party is a success.

Factors to Consider

Number of People

When it comes to planning a pizza party for 20 people, one of the first things you need to consider is the number of guests or attendees. The size of your group will play a significant role in determining how many pizzas you need to order.

So, what’s the ideal number of pizzas for a group of 20? Well, there isn’t a one-size-fits-all answer to this question, as it depends on several factors. One of the most important factors is the appetite of your guests. If you have a group of mostly light eaters who will only have a slice or two, you’ll need fewer pizzas than if you’re feeding a crowd of teenage boys with insatiable appetites.

Another consideration is the size of your pizzas. Most pizzerias offer multiple sizes, ranging from personal pan pizzas to extra-large pies. If you choose larger pizzas, you’ll need fewer overall to feed your group.

Finally, it’s essential to consider any dietary restrictions or preferences among your guests. If you have a mix of vegetarian and meat-eating guests, you may want to order a variety of pizzas to accommodate everyone’s needs.

To get a rough estimate of how many pizzas you need, a good rule of thumb is to assume two slices per person. So for a group of 20, you would need 10 pizzas. However, keep in mind that this is just an average consumption estimate and may not apply to every situation.

In summary, when planning a pizza party for 20 people, take into account the appetite of your guests, the size of your pizzas, and any dietary restrictions to determine the ideal number of pizzas to order.

Pizza Size

When it comes to pizza size, the diameter of the pie is the key factor to consider. Most pizzerias offer a range of sizes, typically measured in inches. The most common sizes are small (8-10 inches), medium (12 inches), large (14-16 inches), and extra-large (18-20 inches). However, some places may have even larger options.

Choosing the right pizza size for your group of 20 people depends on a few factors, such as appetite and toppings. If you’re planning a party with a mix of light eaters and heavy eaters, a variety of sizes might be the best option. For example, ordering a couple of small pizzas with vegetarian toppings for those who prefer lighter fare, and a large or extra-large pepperoni pizza for the meat lovers in the group.

It’s also important to keep in mind that the bigger the pizza, the more slices it will have. A small pizza typically has 6-8 slices, while a large or extra-large can have up to 16 slices. This means that if you order one large pizza for 20 people, they’ll only get about 1 slice each. In this case, it might be better to order several smaller pizzas to ensure that everyone gets their fair share.

Ultimately, the size of the pizzas you order should reflect the preferences and appetites of your group. Keep in mind that most pizzerias offer customizable options, so don’t hesitate to ask for specific sizes or toppings that aren’t listed on the menu. By considering all the options available, you can ensure that everyone at your event leaves satisfied and well-fed.



When you’re planning a party or event with food involved, one important factor to consider is your guests’ appetites. People’s eating habits can vary greatly depending on various factors, including age, gender, activity level, and personal preferences. Here are some things to keep in mind when it comes to appetite:

Hungry Guests

If you’re hosting a group of hungry guests, you’ll want to make sure there is plenty of food to go around. These might be people who haven’t eaten much beforehand or who have worked up an appetite with physical activity. In terms of pizza, you may need to order more than the standard recommended ratio of one pizza for every three to four people. You could also consider offering appetizers or sides to help tide guests over before the main course.

Full Guests

On the other hand, if you have reason to believe that your guests will be arriving already full (such as if they’ve just come from a meal), you can likely cut back on the amount of pizza you order. In this case, the standard ratio should suffice, but you may still want to offer some lighter options like veggie pizzas or salads for those who want something to nibble on.

Light Eaters

Some people simply don’t eat much, whether due to dietary restrictions, small appetites, or other reasons. If you’re catering to a group of light eaters, you can probably get away with ordering slightly less pizza than the standard ratio suggests. You could also consider offering smaller pizza sizes or individual pizzas to accommodate different appetites.

Heavy Eaters

Finally, if you’re hosting a crowd of heavy eaters, you may need to order more pizza than usual. These might be people who work physically demanding jobs, athletes, or just those who love to indulge in hearty meals. In this case, consider ordering larger pizza sizes or doubling up on toppings to help satisfy their appetites.

Ultimately, the best way to gauge your guests’ appetites is to consider the context of your event and your specific group of people. Don’t be afraid to ask for input or to err on the side of caution by ordering more pizza than you think you’ll need. After all, leftovers are never a bad thing!



When it comes to pizza, the toppings are what make it truly unique and customizable. Whether you’re a vegetarian or a meat lover, there is a pizza topping out there for everyone. Here are some of the most popular pizza toppings:

  • Vegetarian: For those who prefer a plant-based diet, vegetarian toppings such as mushrooms, onions, peppers, olives, and tomatoes can add depth and flavor to a pizza without the need for meat.

  • Meat Lovers: On the opposite end of the spectrum, meat lovers can enjoy delicious toppings like pepperoni, sausage, ham, bacon, and even chicken. These flavorful toppings can add protein and texture to a pizza.

  • Cheese: No pizza is complete without a generous amount of cheese. Mozzarella is the most common cheese used on pizza, but other varieties like parmesan, cheddar, and feta can add different flavors and textures.

  • Veggies: For those who want to add even more vegetables to their pizza, options like spinach, broccoli, artichokes, and even eggplant can provide a healthy and tasty addition.

It’s important to keep in mind that not all toppings work well together. While it may be tempting to load up your pizza with every topping imaginable, it’s best to stick to a few complementary flavors. For example, a vegetarian pizza with spinach, mushrooms, and feta cheese can be a delicious combination, while a meat lover’s pizza with sausage, pepperoni, and bacon may be overwhelming.

Ultimately, the toppings you choose for your pizza come down to personal preference. Whether you’re a fan of vegetables, meat, or both, there is no wrong way to top a pizza. Experiment with different combinations to find your perfect pie.

Calculating Number of Pizzas Needed

Pizza Per Person Ratio

The Pizza Per Person Ratio is an essential factor to consider when planning a pizza party for 20 people. So, what’s the rule of thumb for determining how many pizzas you need? It primarily depends on the average consumption and slices per pizza.

Typically, it’s safe to assume that each person will eat around two to three slices of pizza. Therefore, if you have 20 guests, you’ll need about 40-60 slices. But how does this translate into the number of pizzas you should order?

A standard large pizza typically comes with eight slices. If you’re ordering a variety of toppings or catering to different dietary restrictions, you might want to mix-and-match different pizza sizes to accommodate everyone’s preferences. For example, you could order six large pizzas (48 slices) and two medium pizzas (24 slices) to make up the 72 slices needed for your group.

To be precise, you can use the following math formula:

(Number of guests x Slices per person) / Slices per pizza = Number of pizzas needed

So, for a group of 20 people, you’ll need:

(20 x 2) / 8 = 5 pizzas

However, you might want to round up to six pizzas to ensure that everyone has enough.

It’s always better to overestimate the number of pizzas needed than underestimate it. You don’t want to run out of food in the middle of the event and leave your guests feeling hungry and disappointed.

In summary, the Pizza Per Person Ratio is an important aspect to keep in mind while ordering pizzas for a group of 20 people. Using the rule of thumb of 2-3 slices per person and the math formula provided, you can calculate the perfect amount of pizza to satisfy your guests’ appetites and avoid any unnecessary stress during the party.

Math Formula

Math Formula

When it comes to calculating how many pizzas you need for 20 people, using a math formula can be helpful. Here’s how to do it:

  1. Divide the number of people by the average number of slices per pizza. For example, if you assume that each person will eat 2 slices, you would divide 20 by 2, which equals 10.

  2. Round up to the nearest whole number. In this case, since you cannot order half of a pizza, you would round up to 11.

  3. Multiply by the size of the pizza in inches squared and then divide by π (pi). Pi is approximately 3.14. So, for example, if you are ordering 14-inch pizzas, the formula would be:

    (11 x ((14/2)**2) x 3.14) / 14 = 108 square inches per slice

By following this formula, you can calculate the total number of square inches needed to feed your guests based on their estimated appetite and the size of the pizzas you plan to order. This can help ensure that you have enough food without wasting money on too many pizzas.

It’s important to keep in mind that this formula is just an estimate and may not be perfect for every situation. Factors like appetite, toppings, and pizza size can all influence how many pizzas you really need. However, using this math formula is a great starting point for planning your pizza party and ensuring that everyone leaves satisfied.

Examples and Recommendations

Scenario 1: A Casual Gathering

Scenario 1: A Casual Gathering

When it comes to hosting a casual gathering with 20 people, pizza is a crowd-pleaser that’s easy to serve and doesn’t require a lot of effort on your part. Whether it’s a backyard barbecue, a game night with friends, or a potluck-style get-together, pizza can fit the bill for any informal event.

One of the great things about pizza is the vast variety of toppings available, which makes it easy to cater to everyone’s tastes and preferences. From classic pepperoni and cheese to vegetarian options like mushroom and green pepper, you can mix and match toppings to create a pizza that suits your guests’ individual tastes.

To make things more interesting, consider getting creative with your toppings. For example, you could make a pizza with pineapple and ham for a Hawaiian-inspired twist or even try something more unusual like shrimp and pesto.

When planning for this type of gathering, it’s recommended to order a few different types of pizzas with a variety of toppings. This way, guests can mix and match slices as they please, and everyone has the opportunity to try something new.

Another benefit of ordering several pizzas is that it allows for some flexibility in terms of accommodating dietary restrictions or preferences. You can opt for a vegetarian pizza, gluten-free crust, or even a half-and-half pizza to accommodate everyone.

Overall, when planning a casual gathering with 20 people, pizza is a tasty and convenient option that won’t break the bank. By offering a variety of toppings and encouraging guests to mix-and-match, you can create a fun and memorable experience for all.

Scenario 2: Hungry Crowd

Scenario 2: Hungry Crowd

Are you hosting a sports game for a group of teenagers with insatiable appetites? If so, it’s important to plan accordingly and order enough pizza to satisfy their hunger.

On average, a hungry teenager can consume anywhere from 3-5 slices of pizza per meal. Since a standard large pizza typically has 8 slices, this means you’ll need at least 4-6 pizzas to feed a group of 20 hungry teenagers.

However, it’s always better to err on the side of caution and order a few extra pizzas just in case. After all, there’s nothing worse than running out of food before everyone is satisfied!

When ordering pizzas for a hungry crowd, it’s important to consider their preferences as well. While pepperoni and cheese are popular choices, you may also want to consider ordering pizzas with meat toppings such as sausage or bacon, as they tend to be more filling. You could also get creative and order specialty pizzas with unique toppings that cater to different tastes and dietary restrictions.

In addition to pizzas, you may also want to consider ordering sides such as garlic knots, breadsticks, or salad to provide additional sustenance and variety.

By following these tips and considering the needs of your hungry teenage guests, you’re sure to host a successful event that leaves everyone feeling satisfied and content.

Scenario 3: Light Eaters

Scenario 3: Light Eaters

If you’re planning a low-key party or have small children attending, it’s important to take into consideration that not everyone will have a big appetite. With this in mind, you don’t want to order too much pizza and end up with a lot of leftovers or wasting food.

A good rule of thumb for light eaters is to order approximately one pizza for every four people. This way, each person can still have a few slices without feeling overwhelmed by the amount of food on offer. You can also consider offering some healthier options such as a salad or vegetable platter to balance out the heavy carb load of pizza.

It’s important to keep in mind that young children may not be able to eat an entire slice of pizza, so it might be a good idea to cut the slices in half or even quarters to avoid unnecessary waste. It’s also wise to check with parents ahead of time about any dietary restrictions or allergies their children may have to ensure that everyone feels included and catered for.

Overall, when planning for a group of light eaters, it’s always better to err on the side of caution and order slightly less pizza than you think you’ll need. Remember, it’s much easier to order more if necessary than to deal with a surplus of unwanted food. By following these tips, you’ll be sure to make your small gathering a success while keeping everyone happy and satisfied!



When planning a party or gathering, it’s important to consider the varying appetites and dietary restrictions of your guests. To ensure that everyone can enjoy the food on offer, it’s always best to err on the side of more pizza.

While it might seem wasteful to order extra pizzas, having leftovers is actually a good thing. Not only does it mean that guests can have second helpings, but also you can save the extras for later or send them home with your guests.

Another important factor to keep in mind when ordering pizza for a group is dietary restrictions. Be sure to ask your guests if they have any special requirements, such as being vegetarian or gluten-free. If possible, order pizzas that cater to these needs to ensure that everyone has something to eat.

Finally, don’t forget to consider your own preferences and budget when ordering pizzas. Some toppings are more expensive than others, so it’s important to strike a balance between variety and cost. And remember, it’s always better to have too much pizza than not enough!

For example, let’s say you’re hosting a birthday party for 20 people and plan to order pizzas for everyone. You know that three of your guests are vegetarians, so you make sure to order a few veggie pizzas in addition to the meat options. You also decide to order a few extra pizzas, just in case everyone is extra hungry.

After the party, you’re left with a few leftover pizzas. Rather than throwing them away, you store them in the fridge for later. The next day, you warm up the leftovers for lunch and are reminded of what a great party it was.

In summary, when ordering pizza for a group, it’s important to consider the number of guests, their appetites and dietary restrictions. Always order extra pizzas to be safe and don’t be afraid of leftovers – they can be a great way to enjoy the party even after it’s over.
As you can see, calculating the number of pizzas needed for a group of 20 people may seem like a daunting task. But with a little bit of planning and some basic math, you can ensure that everyone at your pizza party is well-fed and happy. Remember to consider factors such as pizza size, appetite, and toppings, and use our recommended ratio of one pizza per four to five people. And don’t forget to plan for leftovers and consider any dietary restrictions! With these tips in mind, you’re sure to be the host of a successful pizza party. So go ahead and order those pies, sit back, and enjoy the company of your friends and family over some delicious pizza!

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