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 > Two Smalls
Two 10″ pizzas (157 sq in) cost more but give less pizza than one 14″ (154 sq in). Stop buying multiple smalls when one large is almost always better.
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.
Domino's Pizza Size Chart — Dimensions, Slices & Servings (Global Guide)
Complete Domino's Pizza Size Chart for US, UK, India, Canada, Australia, Malaysia, and Singapore. Compare dimensions in inches, slice counts, and area to get the best deal.
Read Guide →
Pizza Hut Size Chart — Personal Pan to Large Dimensions Explained
Detailed Pizza Hut size chart in inches and cm. Compare Personal Pan, Medium, and Large sizes across Pizza Hut US, UK, India, Malaysia, and Singapore.
Read Guide →
How Big Is a Pizza? Every Size Explained (7″, 8″, 10″, 12″, 14″, 16″, 20″)
Wondering how big an 8 inch, 7.5 inch, or 20 inch pizza is? Find exact surface area, slice count, and serving sizes for all standard pizza dimensions.
Read Guide →
What is the Best Pizza Size for Two People? (Complete Guide)
Planning pizza night for two? Discover the good and best pizza size for two people, Domino's recommendations, slice counts, and how to avoid overpaying.
Read Guide →
How to Measure Pizza Size Accurately (Diameter, Radius & Area)
Learn how to measure pizza size properly. Step-by-step math guide to measure pizza diameter, calculate surface area, and verify if your pizzeria is shortening your crust.
Read Guide →
Jet's Pizza Size Chart — Deep Dish Square Dimensions & Slices
Complete Jet's Pizza size chart for famous Detroit-style deep dish square pizzas and round pizzas. Slice counts, dimensions, and area comparison.
Read Guide →Frequently Asked Questions
Everything about pizza sizes, areas, and how to get the best value.
Stop Guessing. Start Calculating.
Join over 2.4 million pizza fans who use our free calculator to get the best deal on every order.