Pizza Ordering Calculator
Work out how many pizzas to order for a group — by hunger level, slice math, and diameter value — plus cost per person and the best size deal.
Pizzas to order
3
Breakdown
- Slices needed
- 18
- Slices ordered
- 24
- Leftover slices
- 6
- Total cost
- $42.00
- Cost per person
- $7.00
- Pizza area per slice (cm²)
- 88.36
- Price per 100 cm² of pizza
- $1.98
- Verdict
- a full extra pizza of leftovers — dial slices per person down a notch
Last updated:
FAQ
How many pizzas should I order?
The classic rule is three slices per adult and two per child, then round up to whole pizzas. For mixed crowds, 3 slices each lands well; add 25% for teenage or post-sports groups. Leftover cold pizza is a feature, not a bug.
Is a large pizza a better deal than two mediums?
Almost always. A 35 cm large holds about 36% more pizza than a 30 cm medium, and a 40 cm extra-large holds roughly 78% more — area scales with the square of diameter. Compare price per 100 cm² in the results before upcharging.
How big is a standard pizza slice?
It depends on the cut, not the appetite: an 8-slice medium yields roughly 110 cm² per slice; a 12-slice extra-large about 105 cm². Bigger pizzas sliced into more pieces keep slices manageable but shrink them slightly.
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