Shade Measuring Instruction

Welcome to our guide on measuring for your new shades! With our easy-to-follow instructions and the use of Measurement Finder, you'll be able to gather accurate dimensions for measuring. Follow our expert instructions to guarantee your shades fit perfectly in your space.

Inside Mount VS. Outside Mount: Which One Should I Choose

Before you focus on how to measure windows for blinds or shades, you must decide which type of mounting is right for you. Both inside and outside mounts offer distinct benefits and are suited for different situations.

Inside Mount Your Window Treatments When:

  • Enough window depth for inside mount.
  • To get a sleek and minimalist aesthetic for your space.
  • The window trim is visually appealing and should be highlighted rather than concealed.
  • You prefer window treatments that blend seamlessly with the wall without protruding.
  • The windows have sturdy frames capable of supporting the mounting hardware.
  • The house is relatively new, with well-shaped rectangular windows.
  • The window sill extends outward, complicating the use of an outside mount.

Outside Mount Your Window Treatments When:

  • The window depth is not enough, also is irregularly shaped, unsuitable for an inside mount.
  • The objective is to cover unattractive window trim and refresh the window’s appearance.
  • Maximum light-blocking capability is required when the shades are drawn.
  • The window frame is too fragile or shallow to support an inside mount.
  • Privacy is a primary concern, and the shades need to block external view when closed.
  • The goal is to create the impression of taller, larger windows.
  • When rolled up, the window treatment should be as unobtrusive as possible.

Measure the Window for Inside Mount

① Measure the Depth
Measure the depth at the top of the inside window casing to ensure adequate space for a secure inside mount. This measurement will also determine if a flush mount, where the product sits within the window frame without protruding, is possible. A minimum depth of different shades varies, kindly check the format below for the information of depth requirements for different shades, which is necessary for an inside mount.

② Measure the Width
For Shades: Due to potential irregularities in window shapes, it is recommended to measure the window at three places: across the top, middle, and bottom. Round each measurement down to the nearest 1/8 inch.

③ Measure the Length
To determine the length, also measure the window in three locations: across the left, center, and right. Round each measurement up to the nearest 1/8 inch. Use the largest of these measurements as your ordering length.

Note on Deduction
To ensure the shade fits correctly, take the smallest of these measurements and consider deduction requirements to get the final width measurement.

  • For Roman Shades and Bamboo Shades, headrail width = ordered width (after deduction 3/8 inch from window frame)

Note on Side Gaps

Slight gaps on both sides of shades exist because the shade material is slightly narrower than the headrail. This design allows the shade to roll up and down smoothly without obstruction.

  • For Roman Shades and Bamboo Shades, Fabric Width = Ordered Width

Tips for Inside Mount


  • Confirm if your window has enough depth for an inside mount. If not, no worries! You can switch to an outside mount or explore other suitable products.
  • Examine the window frame or casing to make sure it’s strong enough to drill into directly.

Measure the Window for Outside Mount

① Check the Space
Measure the height above the window for mounting the headrail and ensure there's enough space for secure bracket and headrail installation.
② Measure the Width
Measure the window's width from edge to edge. Optionally, add 2-4 inches (1-2 on each side) to reduce light leakage. Use this adjusted width for ordering.
③ Measure the Length
Measure the window's height from edge to edge. For optimal exposure and to account for the shade's stack height when rolled up, mount the shade 10-12 inches above the frame if possible.

Tips for Outside Mount

Allow Extra Space: Include space for the headrail and brackets when measuring. Add extra width to cover trim or at least 4 inches for light control and privacy.
Enlarge Window Illusion: Extending blinds beyond the window frame creates a larger appearance and enhances the room's grandeur.
Check Mounting Space: Ensure there's a flat surface of at least 2 inches above the window for mounting brackets.
Consider Projection Brackets: If window molding interferes with blinds, projection brackets can extend them away from the frame for clearance.