Measure for Standard Products and Simple Fit ("No Tools Installation")

How to Measure for Window Treatments

Before you shop for window coverings, remember that old carpenter's adage: Measure twice, cut (or buy) once.

Know before you shop:

  • Windows that look alike may actually be different sizes, especially on older houses, where they may have been assembled at the job site.
  • "Oh, about 32 inches" may not be accurate enough for some window treatments. Try to measure dimensions down to the nearest 8th of an inch using a steel tape measure.
  • Why do you need a stud finder when you're just measuring windows? Depending on the hardware you'll install in the wall, you'll want to know whether you can drive screws into wooden studs behind the drywall or if you need to throw a package of wall anchors in your shopping cart.

Measure for inside-mounted shades and blinds

Step 1. Begin by making a rough sketch of each window before you begin measuring. For inside-mounted shades and blinds, you’ll also want to include the depth of the window frame.

Step 2. Begin filling in the dimensions of your sketch by first measuring from one inside edge of the window frame to the other. Take measurements at the top, middle, and bottom of the window -- they bow sometimes -- and round the smallest number down to the nearest 8th of an inch.

Step 3. Measure from the top of the inside window frame down to the windowsill for the length. Again, take three measurements and round the largest number up to the nearest 8th of an inch.

Round up? Down? Why it matters

  • There's a reason to choose dimensions carefully. Overstate the window width and your new shades or blinds may not fit. Understate the length and they may leave a gap at the bottom.

Step 4. Measure from the window sash to the front edge of the window frame where it meets the decorative trim.

Find the window’s minimum depth

  • Some shades and blinds may require a minimum depth for mounting, which can be tricky if you have windows that are double-hung -- that is, windows with an upper and lower movable sash. Measure from the lower sash to the front edge of the window frame for the depth.

Step 5. Make a note of any protrusions, such as window cranks, locks, or security hardware. These could keep some inside-mounted window treatments from operating correctly.

Step 6. With sketch in hand, you’re ready to click on Available Products tab on the right window treatment size to suit your room space and decorating style.