How to Measure for Doors & Windows

On a basic level, it may seem that measuring for doors and windows would not be overly challenging. However, when you measure for doors and windows, you must do more than a simple calculation of the length multiplied by the height. Because you will not find a window or a windowsill or a door or doorjamb that is a perfectly straight square or rectangle, you must take different measurements. The way you measure for doors and windows is identical.

Tape measure

Instructions

Measure Width
- 1
  Use a tape measure to measure the width of the window or door opening between the front left and front right of the opening. Record your measurement.
- 2
  Use a tape measure to measure the width of the window or door opening between the middle left and middle right of the window or door opening. Record your measurement.
- 3
  Use a tape measure to measure the width of the window opening between the back left and back right of the window or door opening. Record your measurement.
- 4
  Write the smallest of these three measurements. This is the width you need when shopping for a window or door.
Measure Height
- 5
  Use a tape measure to measure the length of the window or door opening between the top left and bottom left of the opening. Record your measurement.
- 6
  Use a tape measure to measure the length of the window or door opening between the top middle and bottom middle of the window or door opening. Record your measurement.
- 7
  Use a tape measure to measure the length of the window opening between the top right and bottom right of the window or door opening. Record your measurement.
- 8
  Write the smallest of these three measurements. This is the length you need when shopping for a window or door.

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How to Measure for Doors & Windows

Instructions

Measure Width

Measure Height