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Estimate slab area and RCC concrete volume from length, width, thickness and number of slabs — optional mix materials and cost. Steel (if shown) is preliminary only and separate from structural design.
Last updated: Aug 2026
A = L × W × n · V_wet = A × T · V_order = V_wet × (1 + wastage%)
Optional materials use dry factor 1.54 and the selected grade mix. Any steel figure is a preliminary thumb-rule range — not structural engineering design.
Calculate slab area and RCC concrete volume from length, width, thickness and number of slabs. Optional mix materials and cost. Preliminary steel (if shown) is clearly labelled and is not structural design.
Example: 5 × 4 m slab, 150 mm thick, 1 slab, M20, 5% wastage. Area = 20 m². Wet volume = 3.0 m³; order ≈ 3.15 m³. Mix breakdown optional. Steel estimate remains preliminary only if enabled.
Slab area = length × width for one slab. Total area multiplies by the number of slabs. Concrete volume = area × thickness × quantity, then wastage.
Optional: order volume × dry factor 1.54, split by the selected grade mix (e.g. M20 ≈ 1:1.5:3). Assumptions are listed on the result.
No. If enabled, steel is labelled preliminary only — a thumb-rule kg/m³ range for planning. It is separate from structural engineering design. Actual reinforcement must follow drawings by a qualified engineer.
This page focuses on slabs. The RCC calculator covers beams, columns and footings with the same transparent mix and steel disclaimers.