Free Delivery on 100,000+ Eligible Items  Learn More

How to Measure Windows for Blinds

Woman measure window

If you’re thinking of adding window coverings to your home, you’ll need to measure to make sure they’ll fit perfectly. Different types of coverings are available including inside and outside mounted blinds and are measured differently. We’ll show you how to properly measure windows for blinds and make sure that they’re a perfect fit.

Skill Level: Beginner
  1. Step 1 Decide between Inside or Outside Mount


    First, you’ll need to decide whether you want inside mount or outside mount blinds. Inside mount blinds, as the name suggests, mount inside your window frame, while outside mount blinds mount outside or over the window frame. If the depth of your window is shallow, you may need to use outside mount blinds as there may not be room to mount them inside. Inside mount blinds will give you the cleanest look overall, while outside mount blinds offer more variety, as the window frame size doesn’t matter when choosing them.    

  2. Step 2 Measuring for Inside Mount Blinds

    To measure for inside mount blinds, you’ll need to take six measurements. Measure in three spots for height - one on the far left, then the middle and then the right side. Record the longest height. Then measure three times for the width, the across the top, middle and then bottom of the frame. Record the narrowest width. These two measurements along with your window depth will give you the exact measurements for your inside mounted window covering. 

  3. Step 3 Measuring for Outside Mount Blinds

    Measuring for outside mount window coverings is a bit easier. Simply measure the height and width of your window frame to the outer edges. Consider adding 3-inches to your width measurement, which will allow your blinds to extend past the window a bit farther and block more light. You’ll also need to allow about 2-inches above your window frame for any required brackets. 

What You Need for This Project

Related Resources