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Curtain Size Calculator

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Choosing the right size for your curtains can transform the look and feel of a room. That's where a Curtain Size Calculator comes in handy. This tool is designed to help you find the perfect curtain dimensions for your windows, ensuring they fit just right and enhance your space's aesthetic.

Purpose and Functionality

The purpose of a Curtain Size Calculator is straightforward: to provide you with the precise measurements needed for your curtains, based on the dimensions of your windows. It takes into account the width and height of your window, the desired fullness of the curtains, and any extra length for specific styles. This calculator eliminates the guesswork, making it easy for you to get curtains that fit perfectly and look great.

How It Works

The calculator uses simple formulas to determine the right size for your curtains:

  • Curtain Width (CW): Multiply the window width (W) by the fullness factor (F). The fullness factor ranges from 1.5 to 2.5, with 2 being standard for most curtains. This factor determines how full or pleated the curtains will appear.CW = W * F
  • Curtain Length (CL): Add any extra length for style (E) to the window height (H). Extra length can vary depending on whether you want the curtains to puddle on the floor, break slightly at the floor, or just touch the sill or floor.CL = H + E

Step-by-Step Example

Let's go through an example to see the calculator in action:

Suppose you have a window that measures 50 inches wide and 60 inches tall. You're aiming for a standard fullness of 2 and want the curtains to break slightly at the floor, adding an extra 2 inches in length.

  • Curtain Width Calculation:
    • Given: Window width (W) = 50 inches, Fullness factor (F) = 2
    • Calculation: CW = 50 * 2 = 100 inches
  • Curtain Length Calculation:
    • Given: Window height (H) = 60 inches, Extra length (E) = 2 inches
    • Calculation: CL = 60 + 2 = 62 inches

Relevant Information Table

InputDescriptionExample Values
Window Width (W)How full do you want the curtains to be. Commonly ranges from 1.5 to 2.5.50 inches
Window Height (H)The height from the top of the window or curtain rod to the desired ending point of the curtain.60 inches
Fullness Factor (F)How full do you want the curtains to be? Commonly ranges from 1.5 to 2.5.2 (Standard fullness)
Extra Length (E)Additional length for styles like puddling or breaking at the floor.2 inches


The Curtain Size Calculator is a valuable tool for anyone looking to dress up their windows with curtains that fit perfectly. It simplifies the measuring process, ensuring that you get the aesthetic and functionality you desire without the hassle. Whether you're a home decorator, a DIY enthusiast, or simply someone looking to refresh your space, this calculator can help you achieve the look you want with ease.

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