RC Slab Flexural Design

Calculate required slab reinforcement per ACI 318M-19. Input your design parameters and get steel area, bar suggestions, and safety checks.

How to use RC Slab Design

1. Enter concrete compressive strength f'c and steel yield strength fy.
2. Enter the ultimate design moment Mu in kN·m per meter width.
3. Enter the strip width b (typically 1000mm for slabs), effective depth d, and total thickness h.
4. Review the required steel area, minimum steel, and neutral axis depth.
5. Check the status (Tension-Controlled = safe) and choose from suggested bar arrangements.

What is RC Slab Design?

FAQ

What code is this based on?

ACI 318M-19 (metric). Uses the rectangular stress block method with β₁ per ACI Table 22.2.2.4.3, φ = 0.9 for tension-controlled sections, minimum steel per ACI §9.6.1.2, and temperature/shrinkage steel per §24.4.3.2.

What does 'Tension-Controlled' mean?

A tension-controlled section fails by steel yielding before concrete crushing, which is ductile and desirable. The tool checks that the neutral axis depth is within the tension-controlled limit per ACI.

Related tools

• RC Beam Design
• RC Shear Design
• Rebar Weight Calculator
• Concrete Calculator