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Blind Size Calculator

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Blind size calculator helps you choose the right-sized blind for your window so that the blinds will properly cover the window gaps. Whether you want to install them inside or outside the window frame, the tool provides the correct width and length to ensure a perfect fit.

How to Measure Standard Window Blind Sizes?

Measuring the Width:

  • Inside Mount: Measure the inside width of your window frame at three points: the top, middle, and bottom. Use the smallest measurement of the three.
  • Outside Mount: Measure the outside width of your window frame, including any trim or molding. Add 2-3 inches to allow for clearance and overlap.

Measuring the Height:

  • Inside Mount: Measure the inside height of your window frame at three points: the left, middle, and right sides. Use the shortest measurement of the three.
  • Outside Mount: Measure the outside height of your window frame, including any trim or molding. Add 2-3 inches to ensure the blinds hang comfortably below the windowsill.

Additional Tips:

  • Use a metal tape measure for the most accurate sizes.
  • Make sure the tape measure is level when you are measuring.
  • If your window is not square, measure each side separately.
  • Add 1/4 inch to each measurement for a snug fit.
  • When in doubt, it is always better to measure twice before making any cuts.

blind size calculator

This is How the Blind Size Calculator Works!

The calculator is quite simple and easy to use. Simply enter a few inputs and leave the rest to the calculator, such as:

What to Enter?

  • First, choose hanging styles such as inside mount or outside mount
  • Next, enter the required parameters in their relevant field on the calculator

What will you Get?

  • The blind size calculator displays the perfect blind size with accurate width and length in inches
  • The calculator also provides the sizes in other units as well

Common Window Blinds Installation Types:

Various types of blind installations provide different functionalities and styles for windows. 
Each style brings its own look and benefits, making it easier to choose what suits your taste and requirements, such as:

Inside Mount:

  • Blinds are mounted inside the window frame.
  • This option is good if you have limited space or want a clean look.
  • However, inside-mount blinds may not block out as much light as outside-mount blinds.

Outside Mount:

  • Blinds are mounted outside the window frame.
  • This is a good option if you want to block out more light or want a more traditional look.
  • However, outside mount blinds may be more difficult to clean and more likely to be damaged by wind or rain.

No matter which type of blind you choose, it is important to measure your window correctly to ensure a perfect size.

inside mount vs outside mount

Standard Blind Sizes:

While there's no single standard size available for window blinds, most stores offer a range of common blind sizes to fit most windows. Let’s have a look at the window blind size chart:

Blind Type Typical Width Range (inches) Typical Length Range (inches) Features
Horizontal Blinds 24" - 72" 36" - 96" Most common type, includes Venetian, mini, and cellular.
Vertical Blinds 24" - 84" 36" - 132" Ideal for large windows or patio doors.
Roman Shades 24" - 96" 36" - 108" Fabric shades that fold up like an accordion.
Roller Blinds 24" - 96" 36" - 144" Single fabric panel that rolls up and down.
Pleated Shades 24" - 96" 36" - 108" Similar to cellular blinds but with a flatter design.
Sheer Blinds 24" - 72" 36" - 96" Fabric allows light to pass through while filtering it.
Day & Night Blinds 24" - 72" 36" - 96" Alternating sheer and opaque slats for adjustable light control.
Wooden Blinds 24" - 72" 36" - 96" Classic and elegant, but heavier than other options.
Faux Wood Blinds 24" - 72" 36" - 96" More affordable and moisture-resistant than real wood.

How to Choose the Right Mounting Style for Your Window?

Choosing between inside and outside mounts for blinds depends on various factors:

  • Uneven-shaped window: Measure the diagonal length of your window. An outside mount might be better if it varies significantly by over 1 inch.
  • Temperature: Outside mount blinds are better for hot temperatures as they reduce room heat.
  • Desire a larger appearance: An outside mount can hide window trim, making windows appear larger.
  • Obstructions in window frame: Inside mounts might not fit properly if there are obstructions inside the window frame.
  • Complete light blockage: Outside mounts are more effective if you want to block out light completely.


What are Custom-Size Blinds?

Custom-size blinds are like tailor-made suits for your windows! They're not one-size-fits-all, but made to the exact measurements of your window, no matter how uneven or weirdly shaped.

How Wide Should Window Blinds Be?

Blind sizes should be slightly wider than your window frame and long enough to cover the entire opening. You might add 2-3 inches to the width for extra light control and privacy. For length, decide if you want the blinds to reach the windowsill or hang lower for a better appearance.

What Size Blinds for 34.5 Inch Window?

For a 34.5-inch window, choose blind sizes that are at least 34.5 inches wide. Go for 35 or 36 inches wide for a proper fit with good light control. You can even go wider (up to 37.5 inches) for extra coverage and privacy.

Alan Walker

Studies mathematics sciences, and Technology. Tech geek and a content writer. Wikipedia addict who wants to know everything. Loves traveling, nature, reading. Math and Technology have done their part, and now it's the time for us to get benefits.

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