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eng.concrete-flat-slab-deflection Calculator
Calculates two-way flat slab deflection using the ACI simplified method from span, thickness, and superimposed loads. ACI 318 permits waiving deflection calculations when slab thickness meets minimum requirements — otherwise, long-term deflection including creep must not exceed L/480.
Inputs
Span M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Slab Thickness Mm
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Uniform Load Kn M2
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Concrete Fck Mpa
Reference formula or conversion factor shown for context.
Results
midspan deflection (mm)
Maximum lateral displacement of the beam under load. Codes typically limit to L/360 for floors (to avoid cracking finishes) or L/240 for roofs. Excessive deflection signals the beam is undersized.
deflection / span (L/δ)
Maximum lateral displacement of the beam under load. Codes typically limit to L/360 for floors (to avoid cracking finishes) or L/240 for roofs. Excessive deflection signals the beam is undersized.
Ecm (MPa)
Reference formula or conversion factor shown for context.
Eurocode limit L/250
Reference formula or conversion factor shown for context.
check
A pass/fail verification against the applicable code, standard, or threshold.
EC2 simplified
Reference formula or conversion factor shown for context.