Window Header Size Calculator

Introduction: The Window Header Size Calculator helps you determine the appropriate size for the header above your window, ensuring proper support for the structure. It calculates the recommended Window Header Size based on the window’s width and height.

Formula: The calculator uses a simple formula to find the Recommended Window Header Size: Recommended Header Size = Window Width + (2 * Window Height). This accounts for the width of the window and the height on both sides.

How to Use:

  1. Enter the Window Width in inches.
  2. Enter the Window Height in inches.
  3. Click the “Calculate” button to find the Recommended Window Header Size.
  4. The result provides the suggested header size needed for proper support.

Example: For example, if your window has a width of 36 inches and a height of 24 inches, the calculator will recommend the appropriate Window Header Size required for structural support.


  1. Q: Why is a proper header important for windows? A: The header supports the weight of the structure above the window, preventing sagging and ensuring structural integrity.
  2. Q: Can I use this calculator for doors as well? A: This calculator is specifically designed for windows. Door header requirements may differ based on factors like door size and load.
  3. Q: Is the recommended header size the final requirement for installation? A: No, consult with a structural engineer or local building codes to ensure compliance and safety.
  4. Q: How do I measure the window width and height accurately? A: Measure from the outside edges of the window frame for both width and height.
  5. Q: Can I use this calculator for non-standard window shapes? A: This calculator assumes a standard rectangular window shape. Non-standard shapes may require additional considerations.

Conclusion: The Window Header Size Calculator simplifies the process of determining the recommended header size for your window. Ensure proper structural support and installation by using the calculated size as a guide in your construction or renovation project.“`

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