How to Calculate Beam Load
What is Beam Load?
Beam Load Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Formula
Max Load = (F_b × S × 8) / L² for uniformly distributed load
Step-by-Step Guide
- 1Enter beam species, size, span, and load type to find capacity
- 2Apply the formula using your project measurements
- 3Add required safety factors or waste allowances per code
Worked Examples
Input
Douglas Fir 2×10, 12 ft span, Fb=1200 psi
Result
Max UDL ≈ 1200 lbs/ft using section modulus
Common Mistakes to Avoid
- ✕Not applying code-required safety factors or derating
- ✕Forgetting to account for waste and cut losses in material estimates
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