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What Are the Different Motherboard Sizes?

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ATX is both the name of the standard and also how we refer to the most common size.

Mini ITX is the smallest size you're likely to encounter when building a computer at home.

Micro ATX (or mATX for short) is increasingly common.

These boards are the same width as ATX boards, but shortened on one end to be a 244 x 244 mm square .

The ATX standard is the most common form of motherboard design.

eATX is the same length as a standard ATX board, but is a bit wider than ATX .

Some prebuilt systems from big box brands opt for a different shape in order to make manufacturing easier.

Apple uses a different set of standards to build logic boards, the Apple term for a motherboard.