Soffit Panels usually are 12" wide and 1 1/2" high.  However the panel comes in many profiles with one to three ribs, sometime offset in or showing a reveal.  The list covers some of the soffit panels but to see the different profiles you can clink on the panel list at the bottom of the page.

Roofing Profiles

Panel Namesort descending Manufacturer Panel Width Panel Height
A-12-0 Moran 12" 1 1/2"
F-12-0 Moran 12" 1 1/2"
F-12-1 Moran 12" 1 1/2"
F-12-2 Moran 12" 1 1/2"
Flush Panel Pac-Clad 7" or 11" or 12" 1"
FW-12 Panel Berrige 12" 1 1/2"
L-Panel Berrige 11 5/8" 1"
Marquee McElroy 12" 1"
Matrix McElroy 12" 3/8"
Prestige Series Soffig AEP 12" 1 1/2"
Reveal Taylor Metals 6" 1 1/2"
Reveal Panel Pac-Clad 7" or 11" or 12" 1 1/2"
Soffit Panel Metal Sales 12" 1"
TL17-D Metal Sales 11" 1 1/2"