Deflection Calculator
Calculate maximum beam deflection for point and uniform loads on a simply supported beam.
How to Use the Deflection Calculator
- Enter load magnitude in kN (point) or kN/m (UDL).
- Enter beam span in metres.
- Enter flexural rigidity EI in kN·m².
- Compare deflection against L/360 limit.
Use Cases
- •Floor beam serviceability check
- •Steel beam design
- •Timber joist deflection
Formula
Point: δ = PL³/(48EI); UDL: δ = 5wL⁴/(384EI)
Frequently Asked Questions
How accurate is this calculator?
Results are based on standard engineering formulas and are suitable for preliminary estimates.
What units are used?
SI units (metres, kg, kPa) are used unless otherwise noted.
Is it free?
Yes, all calculators are completely free.