How To Calculate Door Frame Size

Determining the size of your door is as simple as taking a few measurements and doing some basic math.

How to calculate door frame size. Determining door frame size. If you have windows and doors in your wall add them as needed with the add a window or add a door option. Framing rough opening sizes are really quite simple. Just add 2 to the width of the actual door size.

Determine the distance from the top of the door to the top of each hinge. The frame height gap can be any size to suit your needs but plus 15 5mm top and bottom works well. This calculator will provide you with the estimated material needed to frame a stud wall and includes the options to add windows and doors. You ve now got the dimensions for your new door.

Gauge the hinge size typically either 3 1 2 4 or 4 1 2 inches as measured including the overall size of both hinges. Internal size 640mm 2 320 14mm 334mm. Measure this edge on the door frame known as the jamb as well. This takes into account the thickness of a standard 3 4 inch doorjamb on each side.

You just need to find the height and width of the door using a measuring tool. Internal width divided by 2 plus 14mm equals required door size. Since you re already writing down measurements now is a good time to record the size of lumber you ll need to make the door jamb. Now all you need to know is how to properly frame your door rough opening.

You should add 2 1 2 to the height of the actual door. It is some times easier to fit doors to a frame than build a frame to a door. The measurements for these have to be added in feet using decimal format. Add 2 to 2 1 2 inch to the measurement of the door s width to determine the total width of the rough opening.

This will give you a 4mm gap between the two doors.