Pizza size calculator
Convert a pizza’s diameter to how much pizza you actually get, and compare it with smaller pizzas.
That's 1.31× as big as a 14-inch large, while an 18-inch extra large is 1.27× bigger. That is about 14.22 slices the size of a 12-inch pizza’s eighths.
What it means
How much pizza is that?
Area of a flat circle, crust included. Thicker or deep-dish pizzas hold more per square inch.
Every unit
That pizza in every unit
Learn
Three things worth knowing
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Square the size
Double the diameter, four times the pizza: a 16″ is four 8″ pizzas.
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A viral pizza fact
A 2014 Twitter post about one 18-inch pizza beating two 12-inch ones went around the world; the geometry was right.
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Two smalls for a large?
Two 10-inch pizzas (157 in²) are less than one 14-inch (154 in²) only just; two 8-inch (101 in²) are far less than one 12-inch (113 in²).
Shortcuts
Popular pizza conversions
Background
About pizza sizes
Pizzas are sold by diameter but area grows with the square of the diameter. A 16-inch pizza is 201 in², a 12-inch 113 in²: one large is worth 1.8 mediums. And one 18-inch pizza (254 in²) has more than two 12-inch ones (226 in²).