How to Measure a Door Jam

When you are remodeling your home, you may want to change some of your existing doors.

A typical door and slabA typical door and slab
The door supplier will require a number of dimensions to be able to order your new door slabs to replace the existing doors. Furthermore, he will need to know the door swings. The average homeowner can measure the door jams easily when he knows what to look for.

Open the door you want to measure.

Measure the width of the door jam. Hook the tip of the tape measure on the left side of the door jam. The jam starts just behind the door trim. Pull the tape to the opposite side of the jam. The jam stops where the door trim on the opposite side starts. The door jam should be 4 9/16 or 6 9/16 inches wide.

Measure the height of the door jam. Place the tip of the tape measure against the floor, and pull the tape measure straight up to the top of the door frame. Read the measurement on the tape measure. This is the height of the door jam.

Measure the thickness of the door. Standard doors will be 1 3/8 or 1 3/4 inches thick. This is the door thickness that the door jam is designed for. Your door jam will measure out to something like 3 foot 0 1/4 inches by 6 foot 8 1/8 inches for a 1 3/8-inch-thick door. This is the information that a door supplier will need to know if you are ordering a new door slab.

Determine the door swing. Place your back against the door hinges. If the doorknob is to your right side, the door has a right-hand swing. If the doorknob is to your left side, the door has a left-hand swing. The door supplier will need this information.

Things You Will Need

  • Tape measure
  • Pencil
  • Paper

About the Author

Jim Wildman served in the United States Marine Corps as a Communication Chief for 10 years. After his tour of duty in Desert Storm he attended Oklahoma State University receiving his Bachelor of Architecture. He worked as an architect for 10 years before starting his own design/build company. He began writing in 2009 for Demand Studios and published on eHow.