Beam Deflection Calculator

Calculate deflection for steel beams, aluminum beams, and simply supported beams

Disclaimer: This calculator provides approximate results for educational and preliminary design purposes only. Always consult a licensed structural engineer for final designs and verify calculations against local building codes.

Beam Deflection Formulas

Deflection = (Load × Length³) / (Constant × E × I)

Different beam types and load conditions use different constants in this fundamental formula.

Why Beam Deflection Matters for Structural Design:

"Beam deflection calculation" is essential for engineers because:

  • Ensures structural safety and serviceability
  • Prevents excessive deformation that could damage finishes
  • Helps select appropriate beam sizes and materials
  • Verifies compliance with building codes and standards

Common Applications:

Steel Beam Design

Calculate deflection for steel I-beams in building construction

Aluminum Structures

Determine deflection in aluminum beams for lightweight structures

Wood Joist Systems

Check deflection limits for floor and roof joists

Simply Supported Beams

Common calculation for many structural applications

How Our Beam Deflection Calculator Works

Select Beam Configuration

Choose from simply supported beams, cantilever beams, or fixed beams with either point loads or uniformly distributed loads.

Input Material Properties

Select from common materials (steel, aluminum, wood) or enter a custom modulus of elasticity for specialized applications.

Get Detailed Results

Receive precise deflection calculations with interpretation against common engineering standards and building code requirements.