How to Measure Inside Mount Vertical Blinds: Steve Tristan’s Tips

Installing vertical blinds is an excellent way to enhance the privacy and aesthetics of your space. However, the key to achieving a seamless look and functionality lies in accurate measurement. Follow this comprehensive guide, inspired by Steve Tristan’s insights, to ensure your vertical blinds fit perfectly.


In a detailed video tutorial, Steve Tristan unveils the essential steps to measure a window for vertical blinds accurately. He emphasizes the significance of measuring the width at the window’s header, as it’s crucial for the blinds’ proper installation. Additionally, he highlights the importance of measuring the height in multiple spots to account for any discrepancies in window dimensions.

Time needed: 5 minutes

Step-by-Step Guide on How to Measure a Window for Vertical Blinds

  1. Measure the Width at the Header

    Positioning: Start at the top of your window, ensuring you have access to the entire width.
    Measure Across: Extend your measuring tape from one side of the window to the other, covering the header’s full width.
    Accuracy Check: Double-check your measurement to ensure accuracy. It’s advisable to measure twice to avoid any mistakes.Measure the width

  2. Measure the Height in Three Places

    Multiple Measurements: Begin at the top of the window and extend your measuring tape to the bottom. Repeat this process in at least three different locations across the window’s width.
    Identify the Smallest Measurement: Compare the three height measurements and note the smallest one. Variations in window construction can lead to slight differences in measurements.
    Measure the heights

  3. Finalizing Your Measurements

    Use the Smallest Measurements: When ordering your vertical blinds, use the smallest width and height measurements. This precaution ensures that the blinds will not scrape against the window sill or floor, allowing for smooth operation and a clean appearance.

Additional Tips

  • Precision Tools: Utilize a steel tape measure for the most accurate measurements. Its rigidity and precision ensure that your measurements are spot-on.
  • Measurement Precision: Always round down your measurements to the nearest 1/8 inch. This practice ensures a snug fit for your blinds, preventing any gaps or overlaps.
  • Professional Consultation: If you encounter any uncertainties or need clarification, don’t hesitate to consult with a professional window treatment installer. Their expertise can provide valuable insights and prevent potential measurement errors.


Measuring a window for vertical blinds might seem daunting, but with the right approach, it’s quite straightforward. By following Steve Tristan’s expert advice, and keeping in mind the additional tips provided, you can ensure your vertical blinds are a perfect fit for your windows, enhancing the functionality and aesthetic appeal of your room. Remember, precision is key in measurements to achieve the best results. Happy measuring!

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