ATX

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ATX motherboard size comparison; rear is on left.

FlexATX (229 × 191 mm)

microATX (244 × 244 mm)

Mini ATX (284 × 208 mm)

ATX (305 × 244 mm)

Extended ATX (EATX) (305 × 330 mm)

WTX (form factor) (356 × 425 mm)

ATX is the most well known motherboard form factor, at 305 x 244mm. (12 x 9.6in)