Calculate the concrete volume, surface area and perimeter of a rectangular slab. A 5 × 6 m slab at 0.15 m thickness needs 4.5 m³ of concrete (30 m² area, 22 m perimeter).
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| W×L×h (m) | Volume (m³) | Area (m²) | Perimeter (m) |
|---|
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Open AI assistant →How to calculate slab concrete volume
V = width × length × thickness (all in metres → result in m³). Add 5–10% waste for overflow and uneven subgrade.
Common mistake
Leaving thickness in centimetres. 15 cm must be entered as 0.15 m — using 15 overstates the volume 100×.