How to Measure Arched Windows for Blinds
Arched and specialty shaped windows add architectural beauty but require careful measuring. This guide covers all arch types and shapes.
Types of Arched Windows
Perfect Half-Circle
Height = half of width
Eyebrow Arch
Shallower curve
Quarter Circle
Corner windows
Gothic/Pointed
Peaked top
Measuring Perfect Half-Circle Arches
A perfect half-circle arch is the easiest to measure because only one measurement is needed - the width determines the height automatically.
Measure the width at the widest point (base of the arch)
Verify it's a perfect half-circle: height should equal half the width
Order using just the width - manufacturer calculates the rest
Example: If your arch is 48" wide, a perfect half-circle would be 24" tall. Measure the actual height to confirm.
Measuring Eyebrow & Non-Standard Arches
If your arch height doesn't equal half the width, you have an eyebrow or elliptical arch. These require more detailed measurements.
Measure the width
At the widest point (base of arch)
Measure the height
From base to highest point of curve
Create a template
Trace the exact curve onto cardboard or paper
Contact us with your template
We'll help ensure a perfect custom fit
Arch Over Rectangle (Combination Windows)
Many windows have an arched top over a rectangular bottom. You have two options:
Option 1: Treat Separately
Cover the rectangular portion with blinds and leave the arch open or with a stationary shade. Most affordable option.
Option 2: Full Coverage
Order matching arch shade + rectangular blind. Measure each portion separately.
Measuring Combination Windows:
- Arch: Width at base, height from base to top of curve
- Rectangle: Width and height of rectangular portion only
Window Treatment Options for Arches
Cellular Arch Shades
Custom-made to follow your exact curve. Energy efficient. Available in perfect arch and eyebrow shapes.
Most PopularPlantation Shutters
Elegant sunburst design for arches. Operable or stationary. Premium look.
Premium OptionLeave Arch Open
Cover only the rectangular portion. Showcases architectural detail. Most affordable.
Budget FriendlyPro Tips for Arched Windows
Use a steel tape measure
Cloth tapes stretch and give inaccurate measurements
Measure to nearest 1/8 inch
Precision matters for custom arch shades
Note frame depth
Inside mount needs at least 1" depth
Take photos
Helpful when discussing with our team
Frequently Asked Questions
Can you put blinds on arched windows?
Yes! Options include custom arch-shaped cellular shades, shutters with sunburst pattern, stationary fabric shades, or covering just the rectangular portion.
How do I know if my arch is a perfect half circle?
Measure width and height. If height equals exactly half the width (e.g., 36" wide = 18" tall), it's a perfect half-circle.
What's the best window treatment for arched windows?
Cellular arch shades are most popular - energy efficient and available in multiple shapes. Plantation shutters with sunburst design are elegant but pricier.
Need Help With Your Arched Windows?
Our experts specialize in custom solutions for specialty shaped windows. Get free advice!