How to Measure for Roller & Zebra Shades
Follow our step-by-step guide for inside- and outside-mount shades. Learn where to measure, which dimensions to enter, and how fabric width affects window coverage.
Inside Mount: Measure Within the Window Opening
An inside mount places the shade within the window recess. Check the available depth first, then measure the opening’s width and height.
Step 1: Check the Recess Depth
Before measuring width and height, check that the recess is deep enough for an inside mount.
- How to Measure: Measure from the front edge of the window recess to the nearest obstruction. Check for handles, locks, or trim that could interfere with installation.
- Minimum Depth: At least 1 3/4" (4.5 cm) is required for installation.
- Fully Recessed Fit: At least 3 3/8" (8.5 cm) is required for the headrail to sit fully within the recess. With less depth, the headrail may protrude.
If the available depth is less than 1 3/4" (4.5 cm), choose an outside mount. See our Outside Mount Measurement Guide.
Step 2: Measure the Inside Width
- Measure the window opening at the top, middle, and bottom.
- Record the smallest width.
⚠️ Notes: Enter this measurement without making any deductions. We will deduct approximately 3/16" (5 mm) from the width during production to allow for installation.
Step 3: Measure the Inside Height
- Measure the window opening at the left, middle, and right.
- Record the smallest height.
⚠️ Notes: Enter this measurement as your ordered height. No height deduction will be applied during production.
Headrail & Fabric Width
Inside Mount — All Types:
Finished Headrail Width = Entered Width − approximately 3/16" (5 mm)
Manual Roller Shades:
Fabric Width = Finished Headrail Width − 13/16" (2 cm)
Motorized Roller Shades — Motorized Lift:
Fabric Width = Finished Headrail Width − 1" (2.5 cm)
Motorized Roller Shades — Motorized Lift with Manual Override:
Fabric Width = Finished Headrail Width − 1 1/16" (2.7 cm)
Motorized Zebra Shades:
Fabric Width = Finished Headrail Width − 1" (2.6 cm)
All fabric-width differences are approximate and refer to the total width, not the width on each side.
Outside Mount: Measure Beyond the Window Opening
An outside mount places the shade on the wall or frame outside the recess. Measure the area you want to cover, including your desired overlap around the opening.
Step 1: Outside Mount: Required Mounting Space
At least 1 1/2" (3.8 cm) of vertical mounting space is required above the window opening. Check for trim or other obstructions that could interfere with installation.
Step 2: Measure the Outside-Mount Width
Measure the window opening at the top, middle, and bottom. Use the largest width, then add your desired overlap on both sides to improve coverage and help reduce light gaps.
The fabric is narrower than the finished headrail. Refer to the Headrail & Fabric Width section when deciding your overall shade width.
Step 3: Measure the Outside-Mount Height
Measure from the intended mounting position above the window to where you want the shade to end. Include your desired coverage above and below the opening.
Before You Submit Your Measurements
- Use a steel tape and keep it straight.
- Measure the opening, not just the glass.
- Measure every window separately.
- Check handles, locks, trim, and mounting surfaces.
- Do not make your own inside-mount deductions.
- Confirm your units, mounting type, shade type, and lift option.
Ready to Choose Your Shades?
Explore roller and zebra shades, then select the fabric, color, and operation that suit your space.
FAQs
Q1: Should I measure the glass or the window opening?
Q1: Should I measure the glass or the window opening?
For an inside mount, measure the full opening where the shade will sit, not just the glass. For an outside mount, measure the area you want the shade to cover, including your desired overlap.
Q2: Should I make deductions before ordering?
Q2: Should I make deductions before ordering?
For an inside mount, enter your actual opening measurements without deductions. We deduct approximately 3/16" (5 mm) from the width during production. No height deduction applies.
For an outside mount, enter your intended overall shade dimensions, including your desired overlap, rather than the opening dimensions alone.
Q3: Why is the fabric narrower than the headrail?
Q3: Why is the fabric narrower than the headrail?
Space is needed for the operating components at the ends of the shade. The total fabric-width difference varies by shade and lift type. Refer to the Headrail & Fabric Width section before choosing your coverage width.
Q4: What if my window recess is too shallow?
Q4: What if my window recess is too shallow?
An inside mount requires at least 1 3/4" (4.5 cm) of usable depth. If less space is available, choose an outside mount and check that at least 1 1/2" (3.8 cm) of mounting space is available above the opening.
Q5: Will an outside mount eliminate all light gaps?
Q5: Will an outside mount eliminate all light gaps?
Suitable overlap can improve coverage and help reduce edge light, but it does not guarantee complete darkness. Results also depend on the fabric, mounting position, and window shape.
Q6: How should I measure bay windows, corner windows, or windows with unusual trim?
Q6: How should I measure bay windows, corner windows, or windows with unusual trim?
These layouts need additional clearance planning to prevent neighboring headrails, fabrics, or trim from interfering with the shades. Email service@kurlax.com with clear photos, measurements, and your selected product before ordering.
Need Help Before You Order?
Email service@kurlax.com with your measurements, selected product, lift option, and mounting type. Include clear photos showing the window opening, handles, trim, and available mounting space.