are there more doors or wheels in the world

There is a debate on whether there are more doors or wheels in the world. Estimates of the total number of doors vary, with a source approximating around 8 billion doors based on household counts, another estimating about 42 billion doors worldwide considering residential and commercial buildings, and others citing around 13 billion doors. On the other hand, it is estimated there are about 1.4 billion cars alone in the world, and multiplying by their typical four wheels gives approximately 5.6 billion wheels just from cars. Including wheels on bicycles, motorcycles, trucks (which can have many wheels, e.g., 18-wheelers), office chairs, drawers, gears, and other machinery, the total count of wheels is believed by some to surpass the total number of doors. Moreover, counters for doors argue that buildings, homes, and cabinets contribute billions of doors, potentially outnumbering wheels unless one includes all types of wheels such as gears and small casters. Ultimately, while some conclude there are more doors due to buildings and homes, others support that wheels are more numerous given vehicles, machinery, and the many objects with multiple wheels. So, based on various analyses and approximations, there is no universally agreed exact number, but the current consensus leans toward there being more wheels in the world than doors, especially when all types of wheels are counted beyond just vehicle tires.