पिज्जा साइज कैलकुलेटर
पिज्जा के आकार और कीमतों की तुलना करके जानें कि कौन सा पिज्जा आपके पैसे का सबसे ज्यादा फायदा देता है।
यह कैसे काम करता है
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.
What Pizza Lovers Say
Thousands of savvy pizza fans use PizzaCalc to make the best pizza choice every time.
"I always ordered two mediums thinking I was getting more. Turns out one XL has more pizza AND it's cheaper. This calculator opened my eyes!"
"As a math teacher, I love showing this to my students. Perfect real-world example of why understanding π and area formulas actually matters."
"Saved $20 on our office pizza order. We were ordering 4 mediums when 2 extra-larges gave us more pizza for less. Absolute game changer."
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.