Measuring your windows correctly is the first step to getting Roman shades that fit properly. Even a small measurement mistake can affect how your window shades look and work.
Whether you want inside-mount or outside-mount Roman shades, this guide explains how to measure window width, height, and depth using simple steps.
Quick Reference List
Roman Shades Measurement Conversion Chart
| Measurement | Definition / Recommendation |
|---|---|
| Product | Roman Shades |
| Width | Horizontal measurement from left to right |
| Height | Vertical measurement from top to bottom |
| Depth | Distance from the front of the window frame to the glass |
| Recommended Tool | Steel measuring tape |
| Measurement Unit | Inches |
| Common Precision | Nearest 1/8 inch |
| Mounting Options | Inside Mount and Outside Mount |
What You Need to Measure Roman Shades
Before measuring your windows, collect a few basic tools. Having everything ready makes the process easier and helps prevent mistakes.
You will need:
- Steel measuring tape
- Pencil or pen
- Paper or notebook
- Step ladder (if needed)
- Calculator (optional)
A steel measuring tape is recommended because it stays straight and provides reliable measurements. Write down every measurement immediately so you do not mix up different window sizes.
Inside Mount vs. Outside Mount Roman Shades
Before taking measurements, decide how you want to install your Roman shades. There are two common mounting options.
Inside Mount Roman Shades
Inside-mount Roman shades fit within the window frame or recess. This option creates a clean, built-in appearance and allows the window trim to remain visible.
You must check the available window depth before choosing this option. The required depth depends on the shade’s headrail and mounting hardware, so check the manufacturer’s specifications.
Outside Mount Roman Shades
Outside-mount Roman shades are installed on the wall or window trim rather than inside the window opening. They cover a larger area and can help reduce light gaps around the edges.
This option is useful when the window frame is shallow, uneven, or has obstacles that prevent inside mounting.
How to Measure for Roman Shades Inside Mount
Follow these steps if you want your Roman shades installed inside the window frame.
Step 1: Measure the Window Width
Place your steel measuring tape inside the window frame and measure from the left side to the right side.
Take three separate measurements:
- Top of the window
- Middle of the window
- Bottom of the window
Write down all three measurements and use the narrowest measurement when the manufacturer’s instructions specify this method.
For example, if your measurements are 36 inches, 35 7/8 inches, and 35 3/4 inches, the narrowest measurement is 35 3/4 inches.
Step 2: Measure the Window Height
Now measure the height from the top of the window opening to the sill.
Take measurements in three places:
- Left side
- Center
- Right side
Record all three values. Many Roman shade manufacturers recommend using the tallest measurement for inside-mount height, but always follow the instructions for your selected product.
Step 3: Measure Window Depth
Depth is important because the shade’s headrail and mounting brackets must fit inside the window recess.
Measure from the front of the window opening toward the glass. Check the manufacturer’s minimum depth requirements before ordering.
If your window does not have enough depth, consider an outside mount.
How to Measure for Roman Shades Outside Mount
Outside-mount shades cover the window opening from the outside. You need to measure the total area you want the shade to cover.
Step 1: Measure the Width
Measure horizontally across the area where you want to install the shade.
If you want additional coverage, include an overlap beyond both sides of the window. A common recommendation is approximately 1 1/2 to 2 inches per side, depending on the window and product.
For example, if your window opening is 36 inches wide and you add 2 inches on each side, the total shade width is 40 inches.
Step 2: Measure the Height
Measure vertically from your planned mounting position above the window to the bottom of the area you want covered.
Include any additional coverage needed above or below the opening. Consider the window sill and available wall space before deciding the final height.
Step 3: Record Your Final Measurements
Write down the final width and height in inches. Outside-mount shades are generally made to the measurements you provide, without automatic factory deductions.
Check your selected manufacturer’s ordering instructions before submitting the measurements.
Inside Mount vs. Outside Mount Measurement Chart
| Measurement | Inside Mount | Outside Mount |
|---|---|---|
| Width | Inside frame | Total area to cover |
| Height | Inside opening | Total area to cover |
| Depth | Usually required | Usually not required |
| Extra overlap | No | Optional |
| Installation | Inside frame | Wall or trim |
Common Mistakes to Avoid When Measuring Roman Shades
Small measurement mistakes can cause fitting problems. Keep these points in mind before ordering your shades.
- Using a flexible cloth tape instead of a steel tape measure.
- Measuring only one side of the window.
- Confusing width with height.
- Forgetting to check window depth.
- Applying deductions without checking manufacturer instructions.
- Assuming every window in the house has identical dimensions.
- Forgetting to measure the actual area you want covered.
Always double-check your measurements before placing an order.
Frequently Asked Questions
How do you measure for Roman shades?
Measure the window width and height in three places each. For inside mounts, use the narrowest width and follow the manufacturer’s instructions for height and deductions. For outside mounts, measure the entire area you want covered.
Should Roman shades be wider than the window?
For outside mounting, Roman shades are often made wider than the window to provide additional coverage and reduce light gaps. Around 1 1/2 to 2 inches of overlap on each side is a common starting point.
Do you measure Roman shades inside or outside the frame?
It depends on the mounting style. Inside-mount shades are measured within the window frame, while outside-mount shades are measured across the area you want to cover.
What is the best tool for measuring Roman shades?
A steel measuring tape is a good choice because it provides accurate measurements and stays straight during measuring.
Should I round Roman shade measurements?
Record measurements to the nearest 1/8 inch when supported by the manufacturer’s ordering system. Avoid rounding measurements to whole inches because this can affect the fit.
Conclusion
Measuring for Roman shades is simple when you follow the correct steps. Decide between inside and outside mounting, measure the width and height carefully, and check the window depth when needed.
Always record your measurements and verify the manufacturer’s fitting requirements before ordering. Accurate measurements help your Roman shades fit properly and give your windows a neat, finished appearance.
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Hi, I’m Michael Carter, I write simple, everyday size guides so you can picture any measurement in seconds.