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Door Header Size Calculator — Free Online Tool
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Door Header Size Calculator

Calculate recommended lumber header size based on opening span and building load

Building Code Standard (IRC): Header size requirements depend on the width of the rough opening and the weight/loads supported from above (roof only vs. multiple floors).
Opening & Load Parameters

Calculation Results

⚠️ Door and window header recommendations are based on standard southern yellow pine or SPF #2 lumber. Always consult a structural engineer or local building codes for load-bearing walls.

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