A 12 inch pizza oven is the most popular size for home use. It cooks one 12-inch pizza at a time — roughly 30cm — which suits most households without taking up excessive space. The Ooni Koda 12, Karu 12, and Fyra 12 are all built around this format. Most 12-inch models weigh under 10kg, making them easy to store and move. They reach 500°C and cook a pizza in about 60 seconds. A solid starting point if you are new to outdoor pizza ovens.