An 11-inch round pizza measures 11 inches across through its center, equivalent to 27.94 cm. Its radius is 5.5 inches, and its calculated circular area is about 95.03 square inches.
It has 21% more area than a 10-inch pizza, while a 12-inch pizza has about 19% more area than an 11-inch pizza. Those comparisons assume circular pizzas with the stated diameters.
The diameter does not fix the slice count, crust thickness or serving size. Check those details separately when looking at a menu.
Imagine a circle enclosed by an 11 × 11-inch square. The pizza touches the square at the middle of each side, leaving the corners outside the circle.
11 inches across
.----------------.
/ \
|<--5.5 in-o-5.5 in--->|
\ /
'----------------'
Labeled schematic, not to scale or actual size.
To make a paper reference, draw a circle with a 5.5-inch radius. Measure across the center to verify the full 11-inch diameter. A baked pizza may not be perfectly round or exactly match its nominal size.
The centimeter conversion uses NIST's exact inch definition: 11 × 2.54 = 27.94 cm. Screen zoom and display settings can change the physical size of an image, so use the written measurements.
There is no universal slice count for an 11-inch pizza. The same pizza can be cut into four, six, eight or another number of pieces. The restaurant's cutting style determines the count.
For equal triangular sectors, these are calculated examples:
| Equal slices | Fraction per slice | Area per slice |
|---|---|---|
| 4 | ¼ of the pizza | About 23.76 sq in |
| 6 | ⅙ of the pizza | About 15.84 sq in |
| 8 | ⅛ of the pizza | About 11.88 sq in |
The total stays about 95.03 square inches regardless of the number of cuts. Eight smaller slices do not provide more pizza than six larger slices from the same circle.
If it is party-cut into squares, the pieces may have different areas. Ask how the pizza is cut rather than treating a diameter as a promise of six or eight slices.
The circle-area formula is A = πr². For an 11-inch pizza, π × 5.5² = 30.25π ≈ 95.03 square inches.
| Diameter | Calculated circular area | Comparison with 11 inches |
|---|---|---|
| 10 in | 78.54 sq in | 17.4% less area |
| 11 in | 95.03 sq in | Reference |
| 12 in | 113.10 sq in | 19.0% more area |
| 14 in | 153.94 sq in | 62.0% more area |
The comparison changes depending on which size is the baseline. An 11-inch pizza is 21% larger by area than a 10-inch pizza, but the ten-inch pizza is 17.4% smaller than the eleven-inch pizza.
A 14-inch pizza is three inches wider than an eleven-inch pizza, but the extra area is about 58.90 square inches. Diameter increases and area increases are different quantities.
These figures describe the whole circular surface, including crust. They do not establish equal topping coverage, food weight or calories.
Two 11-inch pizzas have a combined calculated area of about 190.07 square inches. One fourteen-inch pizza has about 153.94 square inches.
That means two eleven-inch pizzas provide about 23.5% more circular area:
(2 × 11²) ÷ 14² = 242 ÷ 196 ≈ 1.2347
This can help compare menu options, but it does not account for differences in thickness, toppings or price. If you want a price-per-area comparison, divide the actual total price of each option by its calculated area.
Use comparable crusts and toppings and include the charges that apply. Two smaller pizzas may also give you different topping combinations, a separate consideration from total surface area.
Use the actual cut and your intended portions. For an example pizza cut into six equal slices:
These are arithmetic divisions, not serving recommendations. Appetite, crust, toppings, sides and plans for leftovers affect what you choose.
When comparing pizzas, compare fractions or area as well as slice counts. Two pieces from a four-slice pizza represent half of it; two pieces from an eight-slice pizza represent only one-quarter.
Size names vary by restaurant. Use the stated diameter instead of assuming “medium” always means eleven inches.
Eleven inches converts to 27.94 cm. Rounding to a whole centimeter gives 28 cm.
No. That is the area of an 11 × 11-inch square. The circle has about 95.03 square inches.
Its circular area is about 2.47 times that of a 7-inch pizza, assuming both are ideal circles.
No. Use nutrition information for the specific product or restaurant recipe. Size alone does not determine the ingredients or their amounts.