How to Measure for Zebra Blinds

Accurate measurements help zebra blinds operate smoothly, sit square in the window and provide the coverage you expect. Measure each opening separately—even windows that look identical can vary.

Before You Begin

• Use a steel tape measure rather than a soft fabric tape.
• Record measurements in the order width × height.
• Measure to the nearest 1/8 inch for imperial orders or nearest millimeter for metric orders.
• Write each window’s location next to its measurements.
• Check for handles, trim, tile, radiators and other obstructions.

Choose Inside Mount or Outside Mount

How to Measure an Inside Mount

1. Measure the width in three places: top, middle and bottom. Record the narrowest width. Do not make your own factory deduction unless the product instructions specifically require it.
2. Measure the height in three places: left, center and right. Record the longest height so the blind can cover the full opening.
3. Measure the recess depth: confirm that the headrail and any projecting hardware will fit without contacting the window handle or glass.
4. Check squareness: compare diagonal measurements. A noticeably uneven opening may be better suited to an outside mount.

How to Measure an Outside Mount

1. Choose the exact area you want the blind to cover.
2. Measure the finished width, including your desired overlap on both sides. A typical starting point is 2–3 inches (5–7.5 cm) per side, but trim and room conditions may change this.
3. Measure from the planned top of the headrail to the point where the blind should end.
4. Confirm that the mounting surface is flat and that the blind will clear handles, cranks and furniture.

Bay Windows and Side-by-Side Blinds

When two blinds meet in a corner or sit next to each other, allow space for the headrails, brackets and controls. Fabric is usually narrower than the finished blind, so a small light gap can appear between neighboring blinds. Make a simple top-view sketch and confirm critical clearances before ordering.

Common Measuring Mistakes

• Assuming all windows are the same size.
• Reversing width and height.
• Measuring only once or only at the center.
• Using the glass size instead of the mounting opening.
• Forgetting handles, trim or the direction a window opens.
• Rounding up an inside-mount width.

Final Pre-Order Checklist

Confirm the mount type, units, width, height, control side and room name. Re-measure any value that looks unusual. If a window has angled trim, a shallow recess or an obstruction, take a clear photo and verify the plan before placing the order.

Frequently Asked Questions

Should I deduct from an inside-mount width?

Usually no. Provide the measured opening width and follow the product-specific deduction policy. Making an extra deduction can create unnecessary side gaps.

How much overlap should I add for an outside mount?

Two to three inches per side is a useful starting point, but the best overlap depends on trim, privacy needs and the available mounting surface.

Can I use one measurement for several windows?

Measure every window. Construction tolerances and trim can make seemingly identical openings slightly different.