Concrete Volume Calculator (Slab)

Calculate how much concrete you need for a flat slab or floor.

Unit System

Length (meters)

Width (meters)

Thickness (cm)

How to calculate concrete volume for a slab

Volume (m³) = Length × Width × Thickness (converted to meters). For a 5m × 4m slab at 15 cm thick: 5 × 4 × 0.15 = 3.0 m³.

Always add a 5–10% buffer for spillage and uneven subgrade.