How to Measure Door Molding Trim

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Wood molding around doorways serves both as a cover-up for the seam where the door meets the wall and a decorative architectural accent. Accurately measuring doorways for molding ensures a proper fit once the trim is cut. Once the doorway has been measured, the width of the molding must be added to the dimensions to account for the miter joint at each corner.

Things You'll Need

  • Measuring tape
  • Measure the width of the door opening using a tape measure. Hold one end of the tape measure flush against the door jamb and pull the tape horizontally across the doorway so it is parallel to the floor and the tape overlaps the opposite jamb. Record the measurement where the tape meets the door jamb.

  • Measure the height of the door by holding one end of the tape measure flush against the floor. Step your on the lip of the tape measure to hold it in place and pull the tape upwards so it overlaps the upper jamb of the door and the tape is perpendicular to the floor. Record the measurement.

  • Measure the width of the trim molding across the back. Add this measurement once to the height of the door opening and twice to the width to obtain the total length of trim necessary for each side of the door. A 7 foot 2 inch high doorway being trimmed with 3 inch wide molding requires 7 feet 5 inches of trim for each side. A 3 foot 8 inch wide doorway being trimmed with 3 inch wide molding requires 4 feet 2 inches of molding.

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  • Photo Credit moulding image by Jim Mills from Fotolia.com
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