# Hollow rectangular beam deflection

Hollow rectangular beams are often used in building sites due to their ability to bear both hearing and bending forces. Additionally, they are more resistant to torsional forces than I-beams. If you need to calculate the deflection of a hollow rectangular beam, you can use this online calculator. Simply enter the length, width, height, wall thickness, select the material, and click calculate to get the beam deflection value.

Inside width = Width - (2 \cdot Wall Thickness)

Inside height = Height - (2 \cdot Wall Thickness)

MI \text{ for hollow rectangle beams } = \frac{\left(Width \cdot Height^3\right) - \left(Inside_width \cdot Inside_height^3\right)}{12}

Deflection = \frac{\left(Length^3 \cdot Force \right)}{\left(3 \cdot Material \cdot MI\right)} \cdot 0.0393701

Bending Stress = \frac{Force \cdot Length}{MI \cdot \left(0.5 \cdot Height\right)}

**Where:**

- MI = Moment of Inertia
- E = Modules of Elasticity in psi