Door Header Size Calculator
Calculate the required header size for door openings based on span and load conditions. Uses standard lumber sizing for residential construction.
in
Rough opening width
in
Rough opening height
ft
Used for load calculations
/12
Rise per 12" run
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Recommended Header Size
—
—
—
Header Size
—
nominal
Span
—
in
Load
—
lbs/ft
Status
—
code compliant
Calculation Breakdown
Step-by-step header sizing
Header Sizing Reference
Common header sizes for door openings
Header Sizing Formulas
Structural calculations for door headers
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Structural Disclaimer: This calculator provides estimates for header sizing based on simplified load calculations. Always consult local building codes and a structural engineer for proper header sizing and construction.