Are your windows awkwardly sized, or do your blinds never fit quite right?
Inaccurately measured window treatments look sloppy, allow excessive glare, and drive up energy bills. Hence, we’ve come up with this perfect step-by-step guide to show you exactly how to measure custom blinds or window shades, so your blinds for windows fit perfectly every time.
And if your last Google search was ‘blinds near me,’ then this guide ensures your measurements are ready for local professionals like i9 Blinds who deliver precise, professional, and stunning results. Let’s dive in!
Inside vs. Outside Mount: What Works Better?
Before measuring, decide how your new blinds for windows will be mounted:
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An inside mount sits within the window frame for a clean, built-in look.
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Outside mount goes on the wall or trim, extending past the window for better coverage and light control.
Tools You’ll Need
Every task requires access to proper tools. Hence, below mentioned tools are essential to get the most accurate measurements for your windows:
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Steel tape measure (no cloth)
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Pencil and paper
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Level (optional)
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Ladder (if windows are high)
STEP BY STEP GUIDE TO MEASURING YOUR WINDOWS
Follow the steps below to ensure you get the most precise measurements of your windows:
Step 1: Measure Inside Mount Width
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Measure across the inside of the window frame at the top, middle, and bottom.
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Write down all three measurements.
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Use the smallest number to ensure the blind fits into narrower parts of the frame
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Record width first (W x H).
Step 2: Measure Inside Mount Height
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Measure from the top to the bottom inside the frame - at left, center, and right.
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Jot down each measurement.
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Use the longest measurement so blinds fully cover the height without falling short.
Step 3: Check Frame Depth
Measure how deep the window frame goes. Many window shades and custom blinds need at least 2 inches of depth for an inside mount. If your frame is a bit shallow, choose an outside mount instead.
Step 4: Measuring for Outside Mount
For a wider, more dramatic look:
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Measure the width across the area you want to cover, and add about 3 inches to both the left and right sides for maximum coverage.
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Measure the height from where the top of the blind will sit to where you want it to reach (sill or below).
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Add 2–3 inches above the window opening to allow for brackets and blackout coverage.
Step 5: Special Cases
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For sliding doors or wide windows, treat them like wide windows—measure carefully for top, middle, bottom
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For arched or specialty windows, it’s best to ask a professional. i9 Blinds offers free in-home measuring for such tricky setups
Step 6: Be Precise
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Measure to the nearest 1/8‑inch - don’t round to half inches
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Always record both width and height clearly.
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Measure every window individually - even if they look similar, slight differences matter.
Step 7: Working with i9 Blinds
i9 Blinds makes the measurement of windows completely seamless. You won’t have to do anything.
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Their experts come directly to your home or office with samples.
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They take accurate measurements and discuss what custom blinds or window shades suit each space.
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This ensures your blinds for windows are perfectly sized and styled.
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You enjoy a seamless experience along with an uplifted ambiance of your space without going anywhere.
Why Accurate Measurements Matter
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Perfect Fit
Ill-fitting blinds leave light gaps and look amateurish. Custom measurements solve that. -
Improved Performance
Properly sized window shades help control light, privacy, insulation, and energy savings -
Professional Finish
Inside-mount tools give a seamless look; outside mounts make the window appear larger and brighten rooms. -
Avoid Returns
Accurate measurements mean you won’t need returns or replacements, saving time and money.
What to Expect Next with i9 Blinds
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Consultation & Measurement: We bring everything you need - no guesswork involved.
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Choose Your Style: Choose your pick from Zebra, roller, cellular, blackout, or sensor‑smart blinds.
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Precision Ordering: Each blind is tailored to fit and designed to last.
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Seamless Installation: Our team installs and fine-tunes for light control, insulation, and smart control.
Final Checklist: Before You Order
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Did you decide on an inside or outside mount?
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Do you have three width and three height measurements (or for each special window)?
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Are measurements to the nearest 1/8‑inch?
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Did you measure frame depth?
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Are all measurements clearly labeled?
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If your answer is “yes” to each, you’re ready to order custom blinds, blinds for windows, or window shades with confidence.
You’re All Set And Ready To Go!
With these easy steps, you're ready to uplift your home’s ambiance and turn your windows into the most stunning features of your home. Whether you’re going DIY or working with i9 Blinds, you'll be guaranteed a professional look and feel, zero light gaps, and a long-lasting performance.
Start measuring smart from today and elevate your space tomorrow.