How to Measure a Door Jamb Width

Written by mark keller
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How to Measure a Door Jamb Width
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The jamb on a door is the vertical part of the door frame. If you are replacing a jamb, or are repairing it, knowing how wide it is is essential. The replacement jamb needs to be of the same width for it to fit properly. Fortunately, measuring the width of a door jamb is easy to do.

Skill level:

Things you need

  • Tape measure

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  1. 1

    Measure the distance between the inside edges of the moulding on both sides of the wall adjoining the jamb. This is the width of your jamb.

  2. 2

    Measure from the visible edge of the jamb to the moulding on the other side if you do not have moulding on both sides of the wall. This will be the width of your jamb.

  3. 3

    Compare your width with standard jamb widths. Most door jambs are 4 9/16 inches wide, while other models are 6 9/16 inches. If yours is a different size, you might not be able to find a replacement of the exact dimensions. In that case, purchase a standard-size jamb that most closely approximates your existing jamb.

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