Load-Bearing Beam Span Calculator
Construction & Home ImprovementEstimate the maximum span for a beam based on size and load, for rough planning purposes.
Rough Estimated Max Span
Very rough planning estimate only — always confirm with a structural engineer or local span tables
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Odeh AhwalBased on 4 sources
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Construction & Home Improvement calculators
Calculator Stats
Creators
Odeh AhwalBased on 4 sources
0people find this calculator helpful
Views
Helpful
Saved
Embeds
Construction & Home Improvement calculators
Frequently Asked Questions
Is this safe to use for actual construction?
No, this is a rough planning estimate only. Always consult a structural engineer or local building span tables before sizing a load-bearing beam.
What factors affect real beam span calculations?
Wood species and grade, beam material (engineered lumber vs solid wood vs steel), load type, and local building code requirements all matter significantly.
Sources
- 2024 International Residential Code (IRC) — Section R602.7 Headers, International Code Council (ICC)
- Span Options Calculator for Wood Joists and Rafters, American Wood Council (AWC)
- Where can I get span tables and span table information for lumber?, American Wood Council (AWC)
- Tutorial for Understanding Loads and Using Span Tables, American Wood Council (AWC)
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