Pizza Size Calculator
Compare pizza sizes and prices to find which one gives you the most pizza for your money.
How It Works
Our calculator uses circle geometry to reveal the true size and value of any pizza — something your eyes can't do on their own.
Enter Pizza Details
Input the diameter and price for any two pizzas you're comparing. Works with inches or centimeters — just toggle the unit.
We Calculate the True Size
Using the formula A = π × r², we compute the exact surface area of each pizza — revealing how much food you actually get.
Compare Value Instantly
See the price per square inch, area difference, and a clear winner — so you always choose the pizza that gives you the most for your money.
Pizza Size Chart — All Standard Sizes
The complete reference for every standard pizza size with diameter, area, slices, and servings.
| Size Name | Diameter | Area (sq in) | Slices | Feeds | vs Small (10″) |
|---|---|---|---|---|---|
| 🍕Personal / Snack | 7″ (18 cm) | 38.5 | 4 | 1 person | 49% of small |
| 🍕Personal | 8″ (20 cm) | 50.3 | 4 | 1 person | 64% of small |
| 🍕Small | 10″ (25 cm) | 78.5 | 6 | 1–2 people | — |
| 🍕Medium | 12″ (30 cm) | 113.1 | 8 | 2–3 people | 44% more |
| 🍕Large | 14″ (36 cm) | 153.9 | 10 | 3–5 people | 96% more |
| 🍕Extra Large | 16″ (41 cm) | 201.1 | 12 | 5–6 people | 156% more |
| 🍕XXL / Party | 18″ (46 cm) | 254.5 | 14 | 6–8 people | 224% more |
| 🍕Giant / Stadium | 20″ (51 cm) | 314.2 | 16 | 8–10 people | 300% more |
Why You Need a Pizza Size Calculator
Your eyes are terrible at judging circular area. Here's why a calculator changes everything.
Your Brain Gets Circles Wrong
We instinctively compare diameters linearly. A 16″ pizza looks "a third bigger" than 12″ — but it's actually 78% more pizza. The calculator reveals the truth.
Price Per Square Inch Is King
The sticker price is misleading. A $15 large at $0.075/sq in is cheaper per bite than a $10 medium at $0.088/sq in. Our calculator does this math instantly.
Area Grows Exponentially
Double the diameter = 4× the pizza, not 2×. That's because area scales with the square of the radius. Even small diameter increases yield big area gains.
One Large Beats Two Smalls on Value
Two 10″ pizzas (157 sq in) cost 30–50% more while providing virtually the same total pizza area as one 14″ (154 sq in). Buying multiple smalls wastes money when one large gives you significantly cheaper pizza per square inch.
The Math Behind Pizza Sizes
A quick geometry lesson that will change how you order pizza forever.
How We Calculate Pizza Size
Every pizza is a circle. To find its true size, we calculate the surface area using the classic circle area formula:
For a 12-inch pizza: A = π × 6² = 113.1 sq in.
For a 16-inch pizza: A = π × 8² = 201.1 sq in.
That's 78% more pizza — not 33% more like the diameter suggests. To compare value, we divide the price by the area to get the price per square inch.
Most people think a 16″ pizza is 33% bigger than a 12″ (because 16 is 33% more than 12). But circle area grows with r², so it's actually 78% bigger. This "pizza paradox" means you almost always get better value ordering larger sizes.
Interactive Calculators & Tools
Use our specialized calculators to plan parties, count calories, formulate dough, calculate tips, and compare prices.
Pizza Party Calculator
Calculate exactly how many pizzas to order for any group size, appetite level, and budget.
Open Calculator →Pizza Calories Calculator
Calculate calories, carbs, protein, and fat per slice across different crusts and toppings.
Open Calculator →Pizza Dough Calculator
Baker's percentage calculator for Neapolitan, NY, Detroit, and Chicago style dough weights.
Open Calculator →Pizza Delivery Tip Calculator
Calculate fair driver tips based on order value, delivery distance, and weather conditions.
Open Calculator →Pizza Budget Calculator
Find out the maximum number of pizzas and slices you can buy for your event budget.
Open Calculator →Pizza Price Comparison Tool
Compare cost per square inch across Domino's, Pizza Hut, Papa John's, and Little Caesars.
Open Calculator →Pizza Size Converter (Inches ↔ CM)
Convert pizza diameter between inches and centimeters with surface area calculations.
Open Calculator →Pizza Slice Area Calculator
Calculate single slice surface area, slice angle, and crust arc length for any pizza.
Open Calculator →Pizza Crust & Volume Calculator
Compare 3D volume of food (cubic inches) across thin, hand-tossed, pan, and deep dish crusts.
Open Calculator →Pizza Leftovers & Storage Guide
Food safety timeline for counter, fridge, and freezer storage plus best reheating methods.
Open Calculator →Brand Size Charts & Guides
Detailed size charts and ordering tips for major pizza chains.
12-Inch vs. 14-Inch Pizza: Medium vs. Large Size Comparison
Wondering if you should upgrade from a 12-inch medium to a 14-inch large pizza? Compare total surface area, slice counts, servings, and price-per-slice math.
Read Guide →Costco Pizza Size Chart: Dimensions, Slices & Food Court Value
Complete Costco Pizza Size Chart. Learn dimensions (18 inches), whole box slice count (12 slices) vs food court slice (6 slices), area math, and calories.
Read Guide →How Many Pizzas for 50 People? Complete Slice & Cost Guide
Planning pizza for 50 guests? Find the exact number of large pizzas to order for adults (19–20 pies), teenagers, or kids, plus flavor split and cost guide.
Read Guide →Little Caesars Pizza Size Chart: Hot-N-Ready & Deep Dish Slices
Official Little Caesars Pizza Size Chart. Dimensions and slices for 14-inch Hot-N-Ready Classic, ExtraMostBestest, and Deep! Deep! Dish Detroit-style 8-corner.
Read Guide →Papa John's Pizza Size Chart: Dimensions, Slices & Crusts
Complete Papa John's Pizza Size Chart. Compare Small (10″), Medium (12″), Large (14″), and XL (16″) dimensions, slice counts, stuffed crust area, and calories.
Read Guide →How to Reheat Pizza in an Air Fryer: Exact Time & Temp Guide
Learn how to reheat leftover pizza in an air fryer to achieve a crispy bottom crust and melted cheese. Exact time and temperature guidelines for every crust type.
Read Guide →Two 12-Inch Pizzas vs. One 16-Inch Pizza: The Math Explained
Which is bigger: two 12-inch pizzas or one 16-inch pizza? See the exact geometric math (Area = πr²), total surface area comparison, crust ratio, and best deal.
Read Guide →
Domino's Pizza Size Chart: Slices, Inches & Servings
Official Domino's pizza size chart. Compare Small (10"), Medium (12"), and Large (14") dimensions, slice counts, square inches, and prices for 2026.
Read Guide →
Pizza Hut Size Chart: Personal Pan to Large Dimensions
Complete Pizza Hut size chart in inches and cm. Compare Personal Pan (6"), Medium (12"), and Large (14") slice counts, crust types, and serving sizes.
Read Guide →
How Big Is a Pizza? Standard Size Guide (Inches & cm)
Quick guide to pizza sizes: Personal (8"), Small (10"), Medium (12"), Large (14"), and XL (16"). See exact slice counts, square inches, and party math.
Read Guide →
What Pizza Size Should You Order for Two People? (Guide)
Ordering pizza for two? Compare Medium (12") vs Large (14") portion sizes, appetite considerations, and find out whether to split one pie or get two.
Read Guide →
How to Measure Pizza Size: Diameter, Radius & Area Math
Learn how to measure pizza diameter, radius, and total surface area. Understand pizza geometry and see why a 16" pizza has double the food of a 12" pie.
Read Guide →
Jet's Pizza Size Chart: Deep Dish & Round Dimensions
Official Jet's Pizza size guide. Compare 4-Corner, 8-Corner Detroit-style deep dish, round, and NY-style crust dimensions, slice counts, and feeds.
Read Guide →Frequently Asked Questions
Everything about pizza sizes, areas, and how to get the best value.
Stop Guessing. Start Calculating.
Use our free, interactive pizza geometry and pricing tools to calculate the best value on every order.