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How Do I Measure My Windows for Blinds?

June 24, 2025

How Do I Measure My Windows for Blinds?

Measuring your windows blinds isn’t as complicated as it might seem. With the right tools, guidance, and a touch of patience, you can ensure a perfect fit for your blinds, whether you’re installing inside or outside mounts. Follow this step-by-step guide to measure your windows accurately and avoid the frustration of blinds that don’t quite fit.

Tools You’ll Need

Before you start, gather these tools to make your measuring process smooth and accurate:

• Steel measuring tape for precise measurements (avoid fabric tapes, as they can stretch).

• Paper and pen to jot down your measurements.

• Ladder or step stool if your windows are set high.

• Smartphone (optional) to take photos, which can help if you consult with a professional.

Now that you’re ready, it’s time to determine whether you’ll opt for an inside mount or an outside mount, as this will dictate how you measure.

Step 1: Decide on Inside Mount vs. Outside Mount

Inside Mount

An inside mount means the blinds will fit snugly within the window frame. This option offers a clean, streamlined appearance – ideal if you want the blinds to sit flush with the wall.

Outside Mount

For an outside mount, the blinds are installed outside the window frame, typically overlapping it. This is a great choice if your window frame is shallow, uneven, or if you want to block out more light.

Once you’ve chosen your mounting style, follow the corresponding measurement instructions below.

Step 2: Measuring for Inside Mount

If you’re measuring for blinds that will go inside the window frame, follow these steps:

1. Measure the Width

Measure the width of your window opening at three points – top, middle, and bottom. Don’t assume that your window is perfectly even. Use the narrowest measurement as your final width to ensure the blinds fit without sticking.

2. Measure the Height

Measure the height of the window from top to bottom in three spots – left, center, and right. Use the longest measurement here to make sure the blinds fully cover the length of the window opening.

3. Check the Depth

The depth of your window frame matters for an inside mount. Some blinds require a minimum depth for proper installation. Use your steel tape to measure the depth from the window’s edge to the back of the frame. Check your desired blinds’ specifications to confirm compatibility.

Pro Tip

Round your measurements to the nearest 1/8 inch, and avoid adding or subtracting anything—the manufacturer will adjust for clearance based on your numbers.

Step 3: Measuring for Outside Mount

For outside-mount blinds, these steps will ensure full coverage and proper functionality:

1. Measure the Width

Measure the width of the area you want the blinds to cover. Typically, this will extend a few inches beyond the window frame on each side to block light effectively. Add at least 3-4 extra inches to your window width for full coverage.

2. Measure the Height

Measure the area from the top where you want the blinds mounted to the bottom of the space you wish to cover. If your blinds will extend below the frame, be sure to include that in your measurement. Add 2-3 extra inches to the height for optimal coverage.

Pro Tip

For outside mounts, double-check your measurements to ensure the blinds fully cover the window and don’t leave gaps for light to seep through.

Step 4: Avoid Common Mistakes

While measuring for blinds is straightforward, there are some easy-to-make mistakes you’ll want to avoid:

1. Using the wrong tools – Always use a steel measuring tape for reliable accuracy.
2. Rushing the process – Double-check all your measurements before finalizing them.
3. Forgetting about depth – Inside mounts need a certain depth for the blinds to fit and function properly.
4. Ignoring potential obstructions – Watch for handles, locks, or cranks on your windows that might interfere with the blinds.
5. Not accounting for overlap – When measuring for an outside mount, include enough extra width and height for maximum light coverage.
6. Step 5: Final Check and Tips

Before you send off your measurements, review them carefully. Here’s a quick checklist to keep in mind:

• Double-check every measurement, especially if installing multiple blinds in a single room.

• Note down whether the measurements are for inside or outside mounts.

• Confirm the manufacturer’s measuring requirements, as they may vary slightly depending on the blind style.

If you’re feeling unsure, it’s always a good idea to consult a professional or the blinds manufacturer.

Measuring your windows for blinds doesn’t have to be intimidating. With the right tools and this handy guide, you’re on your way to perfectly fitted blinds that elevate both style and functionality in your space. Whether you’re looking for sleek roller blinds or cozy wood tones, the right blinds can transform your home.

If you’re ready to explore your options, check out our collection of stunning window blinds or reach out to a professional for expert advice and installation assistance. Your perfect blinds are just a few steps away!