Properly measuring for inside mount vertical blinds is essential for ensuring a perfect fit and seamless installation. Incorrect measurements can lead to a host of problems, including blinds that don’t cover the window adequately or are too large to fit. In this guide, we’ll share expert tips from Steve Tristan to help you get accurate measurements for your vertical blinds.

For a visual guide on how to measure vertical blinds for an inside mount, watch our comprehensive video tutorial

How to Measure Inside Mount Vertical Blinds: Steve Tristan's Tips
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Table of Contents

  1. Tools You’ll Need
  2. Before You Start
  3. Step-by-Step Instructions
  4. Common Mistakes to Avoid
  5. FAQs
  6. Conclusion

Tools You’ll Need

  • Metal tape measure (for accuracy)
  • Pencil
  • Notepad or measurement sheet
  • Ladder or step stool (if needed)
  • Helper (optional but recommended)

Before You Start
  • Check the Window Frame: Make sure the window frame is in good condition and free from obstructions that might interfere with your blinds.
  • Decide on Overlap: Depending on your preference and need for privacy, you may want the blinds to overlap the window slightly. Take this into account when measuring.

Step-by-Step Instructions

Step 1: Measure the Width

  1. Extend your metal tape measure across the top of the window frame from one inside edge to the other.
  2. Record the measurement to the nearest 1/8 inch.
  3. Repeat this process for the middle and bottom of the window. Use the smallest measurement as your width.

Step 2: Measure the Height

  1. Measure from the inside top of the window frame straight down to the window sill.
  2. Record this measurement to the nearest 1/8 inch.
  3. For consistency, measure the left, center, and right sides. Use the longest measurement as your height.

Step 3: Double-Check Measurements

  1. Repeat the measurements to ensure accuracy.
  2. If there’s a discrepancy, it’s better to measure again than to assume one of them is correct.

Common Mistakes to Avoid

  • Using a Cloth Tape Measure: Cloth measures can stretch or deform, leading to inaccurate measurements.
  • Rounding Off: Always measure to the nearest 1/8 inch for precise fit.
  • Ignoring the Smallest or Largest Measurement: Always use the smallest width and largest height measurement to ensure your blinds will fit.


Q: Can I measure without a metal tape measure?

A: While it’s possible, using a metal tape measure is recommended for the most accurate results.

Q: What if my window is not a perfect square or rectangle?

A: If you’re dealing with an irregularly shaped window, it’s advisable to consult with a professional.


Properly measuring for inside mount vertical blinds may seem like a daunting task, but with these expert tips from Steve Tristan, you’ll get it right the first time. Remember, accurate measurements are key to a seamless and aesthetically pleasing installation. Happy measuring!

Expert Tips by: Steve Tristan

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