Inches
PSI

Formula

MI for hollow rectangle beams = (Width * Height3) - (Inside_width * Inside_height3) / 12
Deflection = (Length3 *Force / (3 * E * MI)
Bending Stress = (Force * Length) / (MI / (0.5 * hHeight)

 

Where,
MI = Moment of Inertia
E = Modulas of Elasticity in psi