Deck Beam Calculator

Mmax = wL²/8 Δ = 5wL⁴/(384EI)

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Calculator

Metric inputs convert internally for calculations.
ft
Clear distance between supports.
ft
Deck width carried by this beam (perpendicular).
psf
People, furniture, temporary loads.
psf
Decking, joists, beam self-weight (estimate).
Use >1.0 for planters, snow, parties, etc.
Built-in properties are typical approximations.
For conservative checks, keep at 1.0.