Pizza Party Calculator

Pizza math: area is what you pay for

Pizza size is given by diameter, but you actually eat area. The formula is A = π · r² = π · d² / 4. Because area grows with the square of the diameter, small diameter differences hide large area gaps. A 35 cm large pizza has A ≈ 962 cm²; a 30 cm medium has 707 cm²; a 20 cm personal has 314 cm². The counter-intuitive result: two 30 cm mediums total 1,414 cm², beating one 35 cm large (962 cm²) by ~47%. The honest comparison metric is price per cm² (or per slice of identical area). For group orders, an adult typically eats 300–400 g of pizza, and a large pizza weighs ~1.2–1.4 kg → feeds 3–4 people.

Applications

Splitting the bill at a pizzeria, deciding "one large or two mediums?", comparing iFood / Rappi / Uber Eats deals where promo pricing hides the per-area cost, and planning office or family orders.

FAQ

Are 2 mediums always better than 1 large? By area, almost always yes — but only if the per-cm² price is similar. Compare R$/cm² directly.

How many slices per pizza? Brazilian pizzerias typically cut 8 slices; some use 6 or 12. Slice count doesn't change total area — only portion size.

What about square or rectangular pizzas? Use A = width × length. A 30×30 cm square pizza has 900 cm², comparable to a 30 cm round (707 cm²) — squares give more area per nominal "size".