How to Measure Windows for Curtains and Blinds
measuring windows for curtains

Measuring windows for curtains and blinds is a task that should not be underestimated or done by guesswork. Incorrect measurements can lead to ill-fitting window finishing that does not match your window frame.

Moreover, getting the measurements wrong can lead to costly issues in the future.

To achieve the perfect fit and look for your windows, accurate measurements are essential. In this comprehensive guide, we tell you about the step-by-step process of measuring windows for curtains and blinds.

Why is Accurate Measurements of Windows So Crucial?

Accurate measurement is the ground work of a successful window treatment installation. Whether you opt for curtains or blinds, precise measurements ensure that the treatments fit snugly and function properly.


Apart from the obvious aesthetic concerns of having ill-fitting window finishings, there are other significant implications of incorrect measurements:

Energy Efficiency – Properly measured curtains and blinds help retain heat in your home and prevent energy wastage by minimizing heat loss through gaps.


UV Protection – Correctly sized window coverings block harmful UV rays, protecting your furniture and interiors from sun damage.


Visual Balance – Curtains that are too short can visually lower the ceiling height, affecting the overall balance and aesthetics of the room.


Cost and Time Savings – Incorrect measurements may lead to the need for additional alterations, resulting in extra expenses and time spent on adjustments.

Tools Needed to Measure Windows for Curtains and Blinds


Before you start measuring, gather the following tools:·        

  1. Measuring Tape – A flexible measuring tape is required for precise measurements.        
  2. Ladder or Step Stool – Depending on the height of your windows, a ladder or step stool may be necessary for reaching high windows.
  3. Notebook and Pen – Write down your measurements for each window.
  4. Assistant (Optional) – Having someone assist you can make the process easier, especially for larger windows.
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Step-by-Step Guide to Measure Windows for New Curtains and Blinds

  • Measure the Width

Start by measuring the breadth or width of the window opening. For curtains, measure the width from one side of the window frame to the other. For blinds, measure the width at three points: the top, middle, and bottom of the window. Record the narrowest width measurement to ensure a proper fit.

  • Measure the Height

Next, measure the elevation or height of the window opening. For curtains, measure from the top of the window frame to the desired length. For blinds, measure from the top of the window frame to the windowsill or desired endpoint. Again, record the shortest height measurement for accuracy.

  • Consider Mounting Style

Depending on the type of curtains or blinds you choose, you may need to consider the mounting style. For the inside mount, measure the width and height of the window opening precisely. For the outside mount, add extra width and height to ensure complete coverage and privacy.

  • Account for Overlaps and Clearances

For curtains, consider adding extra width for fullness and overlap. For blinds, factor in clearances for mounting brackets, handles, and any obstructions that may affect the operation of the blinds. Adding a few extra inches to your measurements can prevent issues during installation.

  • Double-Check Measurements

Once you have completed measuring each window, double-check your measurements to ensure accuracy. Wrong measurements can lead to costly mistakes during installation.

It’s better to spend extra time verifying measurements than to deal with

ill-fitting window treatments later.

Final Thoughts

Measuring windows for curtains and blinds may seem like an overwhelming job, but with the right tools and techniques, it can be done with precision and ease.

Accurate measurements ensure that your window treatments not only look great but also function flawlessly.

Remember to consider mounting styles, overlaps, and clearances to attain the perfect fit for your windows.

Looking for new blinds or curtains?

Whether you’re in search of pencil pleat curtains, eyelet curtains, or roller blinds, La Tenda has a wide range to suit your needs. You can explore our extensive collection of curtains and blinds online, visit our local La Tenda office, or take advantage of our custom curtain service.

If you want to learn more about finding the perfect curtain length, click here for expert advice.