Concrete Volume Calculator — m, m³, bags
How to use this calculator
Select a shape, enter dimensions and choose the unit (m, cm, or mm) from the dropdown, then click Add Item to add it to your project list. Add as many items as you need — slabs, columns, walls, footings, tubes, or custom volumes. The running total updates instantly.
Each item appears in the list below with its shape, dimensions, and volume. Delete any item to update the total. Enable the optional Cost Estimate section to price your concrete by ready-mix delivery, 50 kg bags, or 25 kg bags.
How to Use the Concrete Volume Calculator (Metric)
This multi-shape concrete volume calculator helps you plan entire projects in metric units. Add slabs, columns, walls, footings, tube fills, or custom volumes to build a complete material list. Enter dimensions and choose the unit (m, cm, or mm) from the dropdown next to each input. Each item’s volume is calculated individually and summed into a project total in cubic meters, liters, or number of pre-mixed bags.
Concrete Volume Formulas
Slab/Rectangle: Length × Width × Thickness
Column (round): π × (D/2)² × Height
Column (square): Side × Side × Height
Wall: Length × Height × Thickness
Footing: Length × Width × Depth
Tube/Hole: π × (D/2)² × Depth
Concrete density: 2 400 kg/m³. 1 m³ = 1 000 liters.
Bag Coverage
A 50 kg bag of pre-mixed concrete yields approximately 0.024 m³ (24 liters). A 25 kg bag yields approximately 0.012 m³ (12 liters). For large pours over 1 m³, ready-mix delivery is typically more economical and ensures consistent mix quality per EN 206.
FAQ
How much waste should I add? Use 5% for simple rectangular pours, 10% for typical projects, and 15–20% for complex shapes or uneven ground.
Can I mix shapes in one project? Yes — add as many items as needed. The calculator sums all volumes automatically.
Which currency should I use? Choose from 10 currencies common across the EU and EEA in the settings section below the results.
