One-Way Slab Design Calculator

Single and multi-span one-way slab design with transparent calculation steps

ACI 318-19DPT 1008-61Multi-Span (1–5)Transparent Steps

Note: This tool calculates per ACI/DPT standards but does not replace review by the design engineer.

Building Type

(Auto-suggests live load)

Span L (m)

Panel Width (m)

Plan width for drawing/BOQ only — design still uses a 1 m strip

Support Condition

Number of Spans

Slab Thickness (mm)(Leave blank for auto per ACI Table 7.3.1.1)

Code minimum: L/20 = 250 mm

Use service (unfactored) values in kN/m²; values above 10 are unusual — double-check units

Live Load (kN/m²)

Dead Load (kN/m²)

Permanent loads excl. slab self-weight

Superimposed DL (kN/m²)

Finishes, partitions, MEP (typical: 1.0–2.0 kN/m²)

Concrete Grade

Steel Grade

Design Code

Ready to Calculate

Fill in the form and click "Calculate Design"