Pizza Sizes Explained: From 7 to 18 Inches, and How Much You Really Get

Pizza is sold by its diameter, the distance across, but you eat its area. That's why a small step up in inches gets you much more pizza.

Pizza sizes in inches and centimetres

Size	In centimetres	Area	Compared with a 10-inch
7-inch	18 cm	38 sq in	About half
9-inch	23 cm	64 sq in	81%
10-inch	25 cm	79 sq in	The baseline
12-inch	30 cm	113 sq in	1.44 times
14-inch	36 cm	154 sq in	1.96 times
16-inch	41 cm	201 sq in	2.56 times
18-inch	46 cm	254 sq in	3.24 times

To work it out yourself, halve the diameter, multiply it by itself, then multiply by 3.14.

What "small", "medium", and "large" mean

These words aren't standard. One restaurant's large can be another's medium, so look for the size in inches. If a menu doesn't state it, ask. We only compare prices where the size is stated.

How many people does each size feed?

It depends on appetite and on the base, as thin pizzas are lighter than deep ones. As one real example, Yard Sale Pizza says its 12-inch feeds one person and its 18-inch feeds two hungry people. Our guide on how much pizza to order for a group goes further.

Which size is the best value?

Usually the larger one, as the price tends to rise more slowly than the area. To check, divide the price by the area to get the pence per square inch. Our price comparison pages show this where restaurants state their sizes.