Timber Frame Design Calculator
Beam sizing from span, load, and wood species using NDS bending and deflection checks.
Inputs
ft
psf
ft
in
in
Results
Actual bending stress (fb)
864 psi
Bending demand/capacity ratio0.86
Bending check pass1
Required section modulus86.4 in³
Provided section modulus100 in³
Max deflection0.22 in
Deflection limit (L/240)0.6 in
Deflection demand/capacity0.37
Deflection check pass1
Uniform load on beam400 lb/ft
Max bending moment7,200 lb·ft
Moment of inertia (I)500 in⁴
How to Use This Calculator
- Enter Beam span, Total load (dead + live), and Tributary width.
- Set Beam width (b), Beam depth (d), and Wood species.
- Review the Actual bending stress (fb) (psi) result.
- Use Bending demand/capacity ratio and Bending check pass to inform your decision.
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