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How to measure an opening

Capture the door width, height, and rough opening without mixing up the measurements.

Measure a commercial door openingA hollow-metal door and frame with separate arrows for door width, door height, and the rough opening.Door widthDoor heightRough opening
Step 1 of 4

Step-by-step guide

  1. 1Measure the existing door leaf from edge to edge for nominal door width.
  2. 2Measure the door leaf from top to bottom for nominal door height.
  3. 3Measure the framed wall opening separately and label it as the rough opening.
  4. 4Record each dimension in inches and note whether the opening is new or a replacement.

Transcript

Door size and rough-opening size are different measurements. Measure the door leaf directly for door width and height, then measure the wall opening separately. Keep the two sets of dimensions clearly labeled.

Technical source: Doors & More field measurement guide