How to Measure a Window for Roller Shades

Ill-fitting window shades are every bit as annoying as ill-fitting clothes.

• Too-narrow shades let in more light than they should and expose you to prying eyes.
• Too-wide shades can curl at the edges and rub against the window frame.
• Too-short shades are, well, too short.

You get the picture. Life is less stressful when the window shades fit.

If you buy your window treatments from Aero Shade, we’ll send a professional installer to your home or business, and a perfect fit is guaranteed.

But what if you’re DIYing it with shades from the local box store?

Why Accurate Measurements Matter

Roller shades can dramatically enhance a space, but only when they fit! Measuring incorrectly can lead to gaps, poor light control, or shades that don’t function as intended.

By carefully measuring your windows, you’ll save time, money, and the frustration of redoing the work. Plus, you’ll give any room a polished, tailored appearance.

Tools You’ll Need

• Measuring tape (preferably steel for precision)
• Pencil and paper
• Step stool or ladder (for taller windows)
• Optional: A level (to check for uneven surfaces)

Now you’re set to start.

Decide on the Mount Type

Roller shades can be installed inside or outside the window frames, and your measurements will depend on your chosen mount.

Inside Mount

• This mount fits the shade within the window frame, offering a clean, streamlined look.
• Best for windows with a deep frame or when you want the shade to look flush with the window.

Outside Mount

• The shade sits outside the frame, covering the window and part of the wall.
• Ideal for shallow window frames or when you want to block more light.

How to Measure for Inside Mount Roller Shades

1. Measure the Window Width

• Measure across the inside frame of the window at three points (top, middle, and bottom).
• Write down the narrowest measurement.
• Always measure to the nearest 1/8 inch. Manufacturers typically use the smallest width to prevent the shade from rubbing against the frame.

2. Measure the Window Height

• Measure the inside height of the frame, taking three measurements from left, center, and right.
• Record the longest measurement.
• Manufacturers often use this for vertical fit to ensure your shade covers the entire height.

3. Check Window Depth

• Measure the depth of the window frame from front to back.
• Ensure the window frame is deep enough for an inside mount; most shades require a minimum depth for installation.

How to Measure for Outside Mount Roller Shades

1. Measure Width Coverage

• Measure the entire width of the area you want to cover.
• Add at least 2–3 inches on both sides of the window for better light coverage and privacy.

2. Measure Height Coverage

• Measure from the top of where you want to mount the shade (above the window frame) to the desired bottom point (usually just past the window sill).
• Add extra length at the top if mounting brackets higher than the frame.

3. Double-Check Obstructions

• Verify there’s enough space for the brackets and shade to roll smoothly without obstructions like furniture, trim, or handles.

Tips for Success

• Always use a steel measuring tape for accuracy; fabric or plastic can stretch.
• Write down your measurements immediately and double-check for accuracy at every step.
• If possible, mark the areas on your window or wall lightly with a pencil for easy reference during installation.

Common Mistakes to Avoid

• Rounding Up or Down: Always measure to the nearest 1/8 inch instead of estimating.
• Forgetting to Note Frame Depth: For inside mounts, ensure enough depth for the brackets and roller mechanism.
• Not Considering Light Gaps: Outside mounts help minimize light gaps by extending beyond the window frame.

FAQs: Measuring Windows for Roller Shades

Q: What if my window frame is uneven?

Measure all points (width and height) and use the narrowest width or the tallest height. Most shades are slightly adjustable to account for small discrepancies.

Q: Can I install roller shades in shallow window frames?

Yes, but opt for an outside mount if your frame lacks depth to fit the shade hardware.

Q: How high should I mount outside roller shades?

For best coverage and a dramatic look, mount the shade 2–4 inches above the window frame or higher.

Q: Should I add extra inches for inside mounts?

You don’t need to. Provide exact measurements, and manufacturers will make necessary deductions.

Q: What’s the ideal depth for inside mounts?

Most roller shades require a depth of at least 1.5–2 inches. Check your shade’s specifications before ordering.

Q: Can I use the same measurements for multiple windows?

Always measure each window individually. Even if they appear identical, slight variations can affect fit.

Q: How do I measure for decorative valances or cornices?

Follow the same process for inside or outside mounts, but account for the additional width and height the valance requires.

8. What if I’m unsure about my measurements?

Consult the manufacturer’s measurement guide or reach out to their customer service team. You can also hire a professional to measure and install! Try Aero Shade!