How to Measure a Window for Blinds

Getting the perfect window blinds starts with one important step: measuring your windows accurately. Whether you’re ordering roller blinds, vertical blinds, or faux wood blinds, the right fit makes all the difference between a flawless finish and a frustrating mistake.

This guide will walk you through how to measure windows for blinds like a pro—whether you’re going for an inside or outside mount. With simple instructions, measurement tips, and handy tools, you’ll be well-prepared to measure your window for blinds with confidence.

Inside Mount vs. Outside Mount: What’s the Difference?

Before you grab your measuring tape, first decide how you want your blinds to be mounted. Here’s a quick comparison:

Understanding your mounting preference is essential before you measure window for blinds, as the method will affect the numbers you record.

Tools You’ll Need to Measure Windows for Blinds

To get started, gather these basic tools:

• Steel measuring tape (avoid cloth tapes for accuracy)
• Pencil and notepad (or a digital note app)
• Step ladder (if you’re measuring tall windows)
• Smartphone camera (optional, to take photos for reference)

Pro Tip: Measure to the nearest 1/8 inch and always double-check!

How to Measure Windows for Inside-Mounted Blinds

When measuring for an inside mount, accuracy is critical. Follow these steps:

Step-by-Step Instructions:

1. Measure the Width
   • Measure across the top, middle, and bottom of the inside window frame.
   • Record the narrowest width.
2. Measure the Height
   • Measure from the top inside edge to the window sill at the left, center, and right.
   • Record the longest height.
3. Check Window Depth
   • Ensure your window frame is deep enough to accommodate your chosen blind style.

Sample Measurement Table:

How to Measure Windows for Outside-Mounted Blinds

Outside mounts are more forgiving but still require care.

Step-by-Step Instructions:

1. Determine Coverage Area
   • Add 2–3 inches on each side of the window frame for better light control and privacy.
2. Measure the Width
   • Measure the total width of the area you want to cover (including the added inches).
3. Measure the Height
   • Start from the top point where you want the blind to be mounted down to the desired length (usually a few inches below the window sill or to the floor for full coverage).

Common Mistakes to Avoid When Measuring Windows for Blinds

• Only measure once. Always measure twice to confirm accuracy.
• Rounding measurements up or down, record exact figures to the nearest 1/8 inch.
• Assuming all windows are the same size, measure each window individually—sizes vary even within the same room.
• Forgetting to note the mount type, specify whether the blind will be inside or outside mounted in your order.

Measuring Specialty Windows (Bay, Arched, or Sliding Doors)

Bay Windows

Measure each panel section individually, following inside or outside mount instructions depending on placement.

Arched Windows

Often require custom blinds. Measure the width at the base and the height to the arch’s peak.

Sliding Glass Doors

Measure the full width and height, typically using an outside mount approach. Add 4–6 inches in width for full panel clearance.

Ready for a Perfect Fit? Let East End Blinds Do the Work

Ready to transform your windows with perfectly fitted blinds? Skip the guesswork and let the experts at East End Blinds handle everything from precise measuring to professional installation. With our wide selection of stylish, made-to-measure blinds and a commitment to flawless results, your home will look better than ever. Don’t settle for a poor fit—contact us today to schedule your free consultation and get started on your window makeover.