Knowing how to measure for roller shades is the difference between a clean, finished window and one with gaps, rubbing or crooked edges. The good news is that it takes about ten minutes per window and a steel tape measure. The bad news is that most mistakes happen in the first two minutes.
Here is the simple way to do it, plus how to decide between an inside mount and an outside mount.
Inside Mount or Outside Mount?
An inside mount sits within the window frame. It looks neat and tailored and shows off your trim. It needs enough depth in the frame to hold the shade, so check that first.
An outside mount sits on the wall or trim above the window. It hides uneven frames, covers more of the glass and can make a window look larger. It is also the better choice when the frame is too shallow or there is a handle or crank in the way.
How to Measure for an Inside Mount
Step 1: Measure the Width
Measure the width inside the frame at the top, middle and bottom. Windows are rarely perfectly square, so use the smallest of the three numbers. Write the width first, then the height.
Step 2: Measure the Height
Measure from the top of the frame to the sill on the left, middle and right. Use the longest height if you want the shade to reach the sill. Check this with your installer if the sill is uneven.
Step 3: Check the Depth
Measure how deep the frame is from the glass to the front edge. Make sure it is deep enough for the headrail and that nothing, like a window lock, will block the shade.
How to Measure for an Outside Mount
Measure the width and height of the area you want to cover, not just the glass. Add a few centimetres on each side so the shade overlaps the opening. This reduces light leaking around the edges and makes the window look bolder.
If you are mounting on the wall, decide where the top of the shade will sit. A little extra height above the frame can make the ceiling feel taller.
Common Mistakes to Avoid
- Using a cloth or paper tape instead of a steel tape.
- Rounding numbers instead of measuring to the nearest millimetre or eighth of an inch.
- Measuring only once. Measure twice and compare.
- Forgetting to note whether the shade is inside or outside mount on the order.
If a measurement still feels uncertain, our team can walk you through it. Exceptional customer service is a core part of what we do, and a quick consultation costs far less than reordering a custom shade. Our high-end, quality products are made to your exact size, so accuracy is worth the extra minute.
Frequently Asked Questions
Should I deduct anything from my measurements?
Give us your exact frame measurements. We make the small adjustments needed for a good fit.
What if my window is not square?
Use the smallest width and let us know about the difference. An outside mount can also hide uneven frames.
Can I measure for motorized shades the same way?
Yes, the measuring is the same. Let us know if you want motorization so we can plan the power or battery option.
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