For example, the kerf is 1/2” to accept the weatherstrip.

Standard jamb width. The standard jamb width is 4 5/8 inches. Measure the window jamb's depth. This will be from where the exterior brick mold is attached to the window across to where the interior window trim attaches to the jamb.

Welded hollow metal frame profiles and jamb depths. Standard door width for interiors is 32 inches. Here are the more standard jamb profiles.

You may find that the measurements above are too large, or too small, for your opening. Each exterior jamb has certain portions that will have the same size. This is the minimum width required for a passage door.

You need to figure out if sheer ply plus finished material plus interior sheet rock. In an interior door its 5 1/2 +sheet rock 1in. The door jamb is the frame that installs in the wall and supports the door via hinges.

Originally meaning the vertical members of a framework, the phrase “jamb” has evolved to indicate the frame where the window or doorway is mounted.