Concrete Volume Calculator
Calculate the volume of concrete needed for slabs or foundations.
How to calculate concrete volume for a slab or foundation
Concrete volume is calculated as Length × Width × Thickness. Simply enter the dimensions of your slab, footing, or foundation in meters or feet, and the calculator instantly returns the volume in cubic meters (m³) or cubic feet (ft³). This helps you estimate how much ready‑mix concrete to order, reducing waste and saving money on your construction project.
How to use the Concrete Volume Calculator
Enter the length and width of the area you want to pour, and the thickness (depth) of the slab. Choose your preferred unit — meters or feet. Click "Calculate" to see the exact concrete volume. It works for patios, driveways, shed bases, and any regular rectangular shape.
Example calculation
A patio slab measuring 5 m long, 4 m wide, and 0.15 m thick: Volume = 5 × 4 × 0.15 = 3 m³. You would need 3 cubic meters of concrete for this project. In feet: a 16 ft × 13 ft slab at 6 inches (0.5 ft) thick = 104 ft³.
Frequently Asked Questions
Should I order extra concrete beyond the calculated volume?
Yes, it is recommended to order about 5–10% extra to account for spillage, uneven ground, or slight measurement errors. The calculator gives the exact mathematical volume — add a safety margin when placing your order.
Does this calculator work for cylindrical or irregular shapes?
No, this calculator assumes a rectangular prism shape. For footings with different cross‑sections, or circular columns, you'll need a separate volume formula — but for standard slabs and foundations, this tool is quick and accurate.