Measure across for the width and from the top of the casing molding to the floor for height.
Barn door measurements.
In this example the opening width is 32 4.
Your door s width should be 2 to 3 inches wider than the door opening and 1 inch higher than the dimensions of your opening.
Measure the door width.
Exterior door sizes may even be larger.
The average door width ranges from 24 inches to 36 inches.
If the doorway has moldings measure from outside edge to outside edge to determine the proper door width add about 4 to 6 inches to your measurement.
Measure from inside to inside of the opening.
How to measure for a barn door in three steps.
Generally most standard barn doors are approximately 36 x 84 or 42 x 80 with enough extra lip to overlap most standard door frames 36 x 80 by an inch or so.
Barn door opening measurements while the style of barn door you choose will come down to your personal preference you will need to be aware of barn door vs opening dimensions when making your choice.
Most barn door sizes fall anywhere between 36 wide on the shorter side by 96 tall on the longer side.
Add 1 to 2 per door for overlap depending on privacy needs.
Add 4 to the measurement and you have your recommended door width.
Total door width will be 36.
Measure from outside to outside of casing molding.
Ideally the door will cover 2 to 3 inches beyond the opening on each side.
Sheetrocked opening no trim or casing width.