A round 16-inch pizza measures 40.64 cm across its center, with a radius of 8 inches. Its calculated circular area is approximately 201.06 square inches.
Compared with a 14-inch pizza, it has about 30.6% more area. A restaurant may label it large, extra-large or another size; the diameter is the more useful comparison.
Diameter does not determine slice count, crust thickness, weight or how many people a pizza will satisfy.
Imagine a circle inside a 16 × 16-inch square. The full edge-to-edge line through the center is sixteen inches:
16 inches across
.------------------.
/ \
|<---8 in---o---8 in---->|
\ /
'------------------'
Labeled schematic, not a scale drawing or an actual-size image.
For a physical paper reference, draw a circle with an eight-inch radius. Its diameter should measure sixteen inches. A baked pizza may not form a perfect circle or exactly match a nominal menu size.
Using NIST's inch definition, 16 × 2.54 = 40.64 cm. A screen image does not guarantee that physical size without calibration.
There is no universal slice count. The restaurant's cutting pattern determines the number of pieces. The same sixteen-inch pizza can be cut into six, eight, ten or more slices.
For equal triangular sectors, the calculated areas are:
| Equal slices | Fraction of pizza per slice | Area per slice |
|---|---|---|
| 6 | ⅙ | About 33.51 sq in |
| 8 | ⅛ | About 25.13 sq in |
| 10 | ⅒ | About 20.11 sq in |
| 12 | ⅟₁₂ | About 16.76 sq in |
These are possible cuts, not a promise about a particular restaurant. More cuts create smaller pieces, not more pizza. A square-cut pizza can also have unequal pieces, so the equal-sector table would not describe each piece.
Check the actual cut before using slice counts to plan portions.
The circle-area formula is A = πr². With an eight-inch radius:
π × 8² = 64π ≈ 201.06 sq in
| Diameter | Calculated area | Comparison with 16 inches |
|---|---|---|
| 12 in | 113.10 sq in | 56.25% as much area |
| 14 in | 153.94 sq in | About 76.6% as much area |
| 16 in | 201.06 sq in | Reference |
| 18 in | 254.47 sq in | About 26.6% more area |
See the 14-inch pizza guide for the neighboring smaller size.
A sixteen-inch pizza has 77.8% more area than a twelve-inch pizza. But two twelve-inch pizzas together have 12.5% more area than one sixteen-inch pizza.
These comparisons use perfect circles and include the outer crust area. They do not establish equal thickness, topping amounts or calories.
Start with the actual cut and the portions you intend to divide. For an example with eight equal slices:
These are arithmetic divisions, not serving recommendations. Appetite, crust, toppings, sides and plans for leftovers affect what you choose.
Two slices can mean different amounts: two of six equal slices are one-third of a pizza, while two of eight are one-quarter. Compare the fraction as well as the number of pieces.
Diameter alone cannot establish whether a pizza is enough for two people or another group.
The label depends on the restaurant. Use the stated diameter to compare options rather than assuming a universal size name.
No. Its diameter is twice as long, but its circular area is four times as large.
It is two inches wider and has approximately 26.6% more circular area than a sixteen-inch pizza.
No. That is the area of a 16 × 16-inch square. The circle has approximately 201.06 square inches.
No. Use nutrition information for the specific recipe, crust and toppings.