Pizza Sizes Chart: Inches, Area, Slices & Comparisons

Pizza sizes are measured across the diameter, through the center from one edge to the other. The area grows with the square of the radius, so a pizza only a few inches wider can have substantially more food surface.

Areas use π × (diameter ÷ 2)², rounded to one decimal square inch. The chart compares circles mathematically; not every restaurant sells every diameter, and size labels vary by chain.

Pizza Hut's U.S. size guide gives one concrete example: a 6-inch Personal Pan, 12-inch medium, 14-inch large, and 16-inch extra-large. The same guide says its large pizza is 14 inches across. Those labels describe Pizza Hut's menu and are not a universal U.S. pizza-size standard.

A 14-inch pizza has about 154 square inches of surface area, compared with about 113 square inches for a 12-inch pizza—roughly 36% more area. A 16-inch pizza has about 201 square inches, roughly 78% more area than a 12-inch pizza. Compare diameter and area when choosing between sizes, especially when the slice count or crust differs.

For detailed visuals and portions, see our guides to 7-inch, 11-inch, 12-inch, 14-inch, and 16-inch pizzas.

A pizza's slice count is set by the restaurant or whoever cuts it; it is not determined by the diameter. Pizza Hut says its 12-inch medium and 14-inch large pizzas are cut into eight slices. Other restaurants may cut the same diameter into more or fewer pieces, and party-cut squares differ from triangular wedges.

A smaller slice count means larger individual pieces, not a larger pizza. When comparing how much pizza you get, use the full diameter or area and check the restaurant's listed slice count. Our size-specific pages show slice and portion comparisons for several diameters.

Measure a round pizza edge to edge through the center. That number is its diameter. The radius is half the diameter; it is not the normal size printed on a menu. For example, a 12-inch pizza has a 6-inch radius and about 113 square inches of surface area.

To compare two sizes, divide their areas or calculate each one with the circle formula. A 16-inch pizza is not just one-third larger than a 12-inch pizza by surface area: its 8-inch radius produces about 78% more area than the 6-inch radius of the 12-inch pie. Toppings, crust thickness, and cut style affect the eating experience but not the circle-area calculation.

Frozen pizza sizes depend on the brand and product. Use the package's stated diameter or net weight rather than assuming every frozen pizza follows restaurant labels. A rectangular sheet pizza is measured by its length and width, so its area is length × width; it does not use the round-pizza formula.

Very large specialty pizzas—such as 20-, 24-, or 30-inch pies—have much more area than a typical 12- or 14-inch example. Check the seller's listed diameter and slice count before planning portions. There is no standard number of slices or number of people served across all pizza sizes.