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Comprehensive Guide: How to Measure Inside-Mount Window Blinds

Accurately measuring inside-mount window blinds is crucial for achieving a seamless and visually appealing result. In this comprehensive guide, we will take you through the step-by-step process of measuring inside-mount window blinds. Accurate measurements are essential, as they not only guarantee a flawless fit but also elevate the overall aesthetics and functionality of your space.

Why Inside-Mount Blinds?

Inside-Mount Blinds

Inside-mount blinds offer a seamless and elegant appearance as they emerge directly from within the window frame. These blinds possess the remarkable capability of enhancing the aesthetic appeal of any room they grace. With an extensive range of colors, patterns, and textures, they effortlessly harmonize with your existing decor, leaving a lasting impression of beauty and style. They provide both light control and privacy, giving you the flexibility to create a layered and professional look in your spaces. Before you begin the installation process, it’s crucial to measure your windows correctly to ensure the blinds fit perfectly.

Tools and Materials You'll Need

To measure your windows accurately, gather the following tools and materials:

Equipment / Tools

  • Steel measuring tape
  • A ladder or step stool (if the window is high)


  • Paper and pencil

Now let’s dive into the step-by-step instructions for measuring your windows for inside-mount blinds:

Step 1: Determine If an Inside Mount Blind Is the Right Option

Before proceeding with the measurement process, you need to determine if your window is suitable for an inside-mount blind. Check if there’s enough room within the window opening to accommodate the blind and its heading. If the edge of the window is flush with the wall, you’ll need to opt for an outside-mount blind instead.

Step 2: Measure Window Width

To accurately determine the width of the window opening, it is recommended to conduct three measurements: one at the uppermost point, another in the middle, and a third along the bottom edge or sill. Ensure that each measurement is accurate to within 1/8 inch. Among these three measurements, choose the narrowest one as your inside-mount blind width.

Step 3: Measure Window Height

Similarly, measure the height of the window opening in three different places: along the left side, in the middle, and along the right side. Just like with the width, maintain a precision of within 1/8 inch. Among these measurements, select the longest one as your inside-mount blind length.

Tips for Measuring Windows for Blinds

Tips for Measuring Windows for Blinds

Here are some additional guidelines to guarantee precise measurements: It is crucial to always measure to the closest 1/8 of an inch without rounding up or down.

When noting down the measurements, write the width first, followed by the height. The proper format is “width x height.”

If you’re unsure about making precise measurements, consider contacting a professional from a blind company to come to your home and measure for you.

It is crucial to understand that by providing your own measurements, you assume responsibility if the blinds do not fit perfectly. Since blinds are custom items, precision is crucial to achieve the desired aesthetic.

Dealing with Non-Standard Windows

Non Standard Windows

Dealing with non-standard windows, such as arched, bay, or corner windows, can add a unique charm and character to any living space. However, measuring and installing blinds for these windows can be more challenging than dealing with standard windows. To ensure a perfect fit for inside-mount blinds on your arch window, follow these steps: First, measure the bottom of the arch at its widest point, excluding the trim, and record the measurement to the nearest ⅛ inch. Similarly, measure the height of the arch at its highest point to the nearest ⅛ inch and make a note of both measurements. If your arch window has legs, remember to measure the height of each leg separately, as one may be slightly longer than the other due to settling, which is common in older houses. For those planning to inside mount living room window blinds, you can use the precise measurements taken without making any deductions yourself. Trust the window treatment experts to handle all the necessary calculations for a flawless and seamless fit.

With these detailed instructions and expert tips, you are now equipped to measure your windows accurately for inside-mount blinds. Achieve the perfect fit and transform your living spaces into visually stunning areas that reflect your personal style.

Accurate measurements are paramount when it comes to flawlessly installing inside-mount blinds. By diligently following this comprehensive guide, you will be equipped to measure your windows precisely, ensuring that your blinds fit seamlessly within the frame. Keep in mind that precise measurements not only enhance the aesthetics and functionality of your space but also grant you the advantages of light control, privacy, and an impeccable appearance. Take the necessary time to measure with care, and relish in the stunning transformation of your windows with impeccably fitted inside-mount blinds.

For top-quality blinds and exceptional service, trust The Shutter Source. Contact us now to discover our extensive selection of window treatments and find the ideal solution for your home. Our team is here to assist you in selecting the ideal blinds that meet your style preferences and functional needs.

Chuck Wilton

Chuck Wilton

Veteran design consultant at The Shutter Source specializing in creating stunning window treatments. Offering personalized and professional service that exceeds expectations.

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