Lumber Beam Size Calculator Canada — Floor Beams, Headers, Ridge Beams

Beam Parameters

Beam type

Clear span (ft)

Tributary width (ft) How far the joists span on each side

Load type

Dead load (psf)

Species / grade

Equivalent Options

⚠️ These are simplified estimates based on basic beam bending formulas (L/360 deflection limit). Always verify with a structural engineer or your local building official. Snow loads, point loads, and site-specific conditions are not included.

Canadian Building Code Notes

The NBC (National Building Code of Canada) requires beams to be sized by a qualified designer for loads outside of prescriptive tables. The NBC Part 9 span tables cover most house framing; use them as your primary reference for code compliance.

Deflection limit: L/360 for floors, L/240 for roofs
Snow loads vary significantly by region (reference NBC Appendix C or local authority)
Always check with your local building department before construction