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How To Measure Functioning Shades

Thursday, September 25, 2025 | By: Tammy Thompson

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When measuring for shades, it's important to consider both the desired width and length.

Typically, the width of the shade should be between 1 to 2.5 times the width of the window. Depending on the style of shade.

Shades are usually mounted inside the window molding, although they may extend 1 to 2 inches beyond the window on each side.

The finished length of the shades can vary as well, ranging from touching the windowsill to stopping just below it.

Please refer to the diagrams below for a clearer understanding.


STEP 1: MEASURE YOUR WINDOW

 

FOR INSIDE MOUNT MEASURE:

1. Quantity: the number of windows of the same size.

2. Inside Width: the horizontal size of the window inside the trim (molding).

3. Inside Length: the vertical distance inside the trim. 

 

FOR OUTSIDE MOUNT MEASURE:

 1. Quantity: the number of windows of the same size.

2. Window Width: the horizontal size of the window including trim (molding).

3. and 4. Left and right restrictions: the horizontal space from outside the window trim to the nearest adjoining window, wall, cabinet or other obstruction. 

5. Top of Window to Apron: the vertical distance from top of window trim to the apron.

6. Top of Window to Ceiling: the vertical space between the top of the window trim and the ceiling or crown molding.


STEP 2: DETERMINE FINISHED MEASUREMENTS

• Indicate the Quantity of window treatments. 

• For inside mounts, subtract 1/4” from the inside width for Face Width; add 1/2” to the inside length for the Finished Length. 

• For outside mounts, add 1” to the window width for Face Width; add 6” to the window to apron measurement for Finished Length. Plan to mount so shade extends 4” above and 2” below window, if space allows. 

The finished measurements below are an example of an outside mount.


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