Construction Calc Lab

Structure · Calculator

Beam Deflection Calculator

Calculate midspan deflection of a simply supported beam under a full-span uniform load.

Project inputs

Enter your project values, then press Calculate.

How this calculator works

Calculate midspan deflection of a simply supported beam under a full-span uniform load.

δmax = 5wL⁴/(384EI)
Engineering note: This calculator is for preliminary checking and education. Do not use it as the sole basis for structural design, member selection, code compliance or construction. Use applicable standards and a qualified engineer.

How to use the Beam Deflection Calculator

1. Enter project inputs

  • Beam span (m)
  • Uniform load (kN/m)
  • Elastic modulus (GPa)
  • Second moment of area (cm⁴)

2. Review the results

  • Maximum deflection
  • Span / deflection
  • Maximum moment

3. Check the calculation

The calculator uses the following core relationship:

δmax = 5wL⁴/(384EI)

Design note: This tool is intended for preliminary engineering checks, not final structural design or code compliance.

Beam Deflection Calculator Guide

A beam deflection calculator estimates how much a beam bends under applied loads.

Calculation formula

Deflection depends on Load, Span Length, Elastic Modulus and Moment of Inertia

Estimation tips

Material properties and support conditions affect final deflection values.

Engineering note: Use these calculations for estimation and planning. Always confirm final designs according to project requirements and applicable standards.

Beam Deflection Calculator FAQ

What does the Beam Deflection Calculator calculate?

Calculate midspan deflection of a simply supported beam under a full-span uniform load.

What information do I need to use the Beam Deflection Calculator?

The calculator uses inputs such as Beam span (m), Uniform load (kN/m), Elastic modulus (GPa), and Second moment of area (cm⁴). Use values from your drawings, measurements, product data, or project specifications.

How should I use the results from the Beam Deflection Calculator?

Use outputs such as Maximum deflection, Span / deflection, and Maximum moment for preliminary checking and comparison only. Final structural design, member selection, detailing, and code compliance should be verified by a qualified engineer using the applicable standards.