Mid tower cases are the safe, middle-of-the-road option in PC cases. Generally hovering around 18 inches tall and long, they're large enough to fit a high-end gaming rig in them without difficulty. They're large enough to comfortably build in but not so large as to weigh a ton and take up a lot of space on your desk.

How big is an ATX mid tower case?

PC cases themselves are often referred to by these three form factors, but the terms more accurately refer to the size of the motherboards they can host. ATX boards measure 12 by 9.6 inches, MicroATX up to 9.6 by 9.6 inches (they're sometimes smaller), and Mini-ITX 6.7 inches square.

Can ATX fit in Mid Tower?

ATX motherboards can fit in most full-size and mid-size towers, but it's rare to find a small form factor case that can fit a full size ATX board. There are larger cases designed to support the larger Extended ATX standard motherboards which can usually take ATX boards too.