Door Header Size Calculator

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Calculates the required lumber size for a door header based on the door opening width and the load supported.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Door Opening Width (feet), Load Bearing?, and Number of Floors Above in the units shown.

Step 2

Read Recommended Header Size in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Door Opening Width (feet): 3 ft; Load Bearing?: Yes; Number of Floors Above: 1 floors

Recommended Header Size: 2x6

Door Opening Width (feet): 3 ft; Load Bearing?: Yes; Number of Floors Above: 2 floors

Recommended Header Size: 2x8

Door Opening Width (feet): 5 ft; Load Bearing?: Yes; Number of Floors Above: 1 floors

Recommended Header Size: 2x8

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