You should add 2 1 2 to the height of the actual door.
28 inch door frame size.
Frames that butt wall block or exterior wood stud a opening width 4 1 2 b opening height 2 1 4 the rough opening would be 40 1 2 x 86 1 4 for a 3 0 x 7 0 door frame.
On pre hung doors is 4 9 16 inches.
Particularly with older doors it is important to measure in more than one location just in case the door is not perfectly rectangular.
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Use shims and or caulk to seal gaps between wall and frame.
Getting the rough opening size right the first time will save you from frustration when installing your doors.
There are standard door sizes and some alternates available.
Just add 2 to the width of the actual door size.
Framing rough opening sizes are really quite simple.
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This takes into account the thickness of a standard 3 4 inch doorjamb on each side.
This will give you room to space the door frame off of the sub.
Of frame is 40 x 86 as the frame face is 2 around all 3 sides.
The door jamb.
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Door widths of 30 inches 76 cm 32 inches 81 cm and 36 inches 91 cm are considered standard.
If the amounts vary use the largest figure.
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