About this site
A small, free tool for one job: ordering the right amount of pizza.
What it does
Pizza Calculator answers three questions. How many pizzas should I order for my group? How big is each pizza size? Which size is the better deal? Everything is worked out in your browser. There is no account and nothing to install, and it keeps working without a connection after your first visit.
How the numbers are worked out
The party calculator assumes an adult with an average appetite eats three slices of a large 14-inch pizza, a light eater two, and a very hungry guest four. Kids are counted at one slice fewer. When other food is served, the order drops by a quarter. Thin crust raises the order by about 15% and deep dish lowers it by about 20%. Orders are worked out by area and always rounded up to whole pizzas.
Pizza areas come from simple geometry: π × radius². Slice counts are the most common cut for each size in US pizzerias. Calories are a rough figure based on about 285 calories in a slice of large cheese pizza. Individual shops differ, so check the menu when it matters.
Independence
This site is not affiliated with any pizza chain or delivery service. It is free to use and paid for by advertising.
Corrections
If you spot a mistake, please get in touch.