Pizza Order Calculator (Adults and Kids)
Enter adults and kids to get the number of pizzas and the cost.
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Pizza Order Calculator (Adults and Kids) by TheCalcTools
How the Pizza Order Calculator (Adults and Kids) works
Enter adults and kids and how many slices each usually eats. 3 for adults and 2 for kids is a typical party figure.
Add a buffer for seconds, then divide by slices per pizza and round up.
A share of the pizzas is set aside as vegetarian.
The formula
Worked example
Using the default values shown in the calculator:
| Adults | 20 |
|---|---|
| Kids | 10 |
| Slices per adult | 3 |
| Slices per kid | 2 |
| Slices per pizza | Large (8 slices) |
| Guests who want vegetarian | 15 % |
| Extra for leftovers | 10 % |
| Price per pizza | $14 |
- 20 × 3 + 10 × 2 = 80 slices; with 10% extra = 88 slices.
- At 8 slices per pizza that is 11 pizzas, including 2 vegetarian. Estimated cost $154.00.
Result:
| Pizzas to order | 11 |
|---|---|
| Slices needed | 88 |
| Vegetarian pizzas | 2 |
| Other pizzas | 9 |
| Estimated cost | $154.00 |
| Cost per guest | $5.13 |
Frequently asked questions
How many pizzas for 30 people?
With 20 adults and 10 kids at 3 and 2 slices, about 80 slices plus a buffer, which is 11 large pizzas of 8 slices.
Should I order more for teenagers?
Yes. Teenagers often eat 4 to 5 slices, so set the slices per kid higher.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.