Pizza ovens tend to be measured by the size of the pizza base that they can cook, rather than the exterior dimensions – these usually being either 12in or 16in. A 16in pizza oven is likely to be at least 25–30 inches wide, so make sure you have a big enough table or surface to house it if you're looking to go supersize.
Don't forget, you can also cook a great deal more than pizza in a pizza oven, so if you want to be able to cook a wider range of dishes, you may want to go for a bigger pizza oven size. Head over to our guide on how to use a pizza oven for more top tips.