See http://en.wikipedia.org/wiki/Comparison_of_computer_form_factors
for more information.
Name
PCB Size (mm)
WTX 356×425
AT 350×305
Baby-AT 330×216
BTX 325×266
ATX 305×244
LPX 330×229
NLX 254×228
microATX 244×244
DTX 244×203
FlexATX 229×191
Mini-DTX 203×170
EBX 203×146
Stacking
microATX (Min.) 171×171
Mini-ITX 170×170
EPIC (Express) 165×115 Stacking
Nano-ITX 120×120
COM Express 125×95
ETX / XTX 114×95
Pico-ITX 100×72
PC/104 (-Plus) 96×90 Stacking
PCI-104 96×90
Stacking
mobile-ITX 75×45
In the diagram below, standard paper sizes A3, A4, A5 are shown in red dashes.
