Door Header Size Calculator

Calculate the required door header size based on door type, opening width, and structural requirements

Input Parameters

Calculation Results

Calculation Formula

Header Size = Opening Width + (2 × Stud Width) + (2 × Space for Headers)

Where:
Opening Width: The width of the door opening
Stud Width: Typically 2-1/2" for standard construction
Space for Headers: Additional space for headers based on header type and load

Required Header Size

-- inches --

Required Studs

-- pieces --

Material Recommendation

-- to be determined --

Door Header Size Calculator Calculator Usage Guide

Learn how to use the Door Header Size Calculator and understand door header sizing principles

How to Use This Calculator

  1. Enter the width and height of your door opening in inches.
  2. Select the type of door you're planning to install.
  3. Choose the header type (standard, wood, or metal framing).
  4. Adjust the structural load rating if you know it (standard residential is 40 psf).
  5. Click the "Calculate" button to determine the required header size.

Understanding Door Headers

A door header is the horizontal framing member above a door opening that supports the ceiling and walls above it. Proper header sizing is crucial for structural integrity and compliance with building codes.

Key Considerations

  • Fire-rated doors require larger headers with special materials to maintain fire resistance.
  • Heavy structural loads (like in basements or commercial buildings) require larger headers and potentially metal framing.
  • The stud width is typically 2.625 inches with 1/4" gaps on each side for electrical wiring and plumbing clearance.
  • Header space refers to the area needed for headers above the door opening.

Important Notes

This calculator provides estimates for door header sizing. For custom applications or commercial builds, consult with a qualified architect or engineer. Always follow local building codes and regulations.