Calculate the volume of concrete needed for a slab, footing, or column from its dimensions - useful for ordering ready-mix concrete or planning a site mix.
How to Use the Concrete Calculator
Enter the "Length", "Width", and "Thickness/Depth" of one slab, footing, or column, in meters.
Enter the "Quantity" if you have multiple identical elements.
Enter a "Wastage (%)" allowance for spillage and over-excavation.
Click "Calculate Volume" to see the concrete volume needed - use this figure with the Cement Calculator to break it into cement, sand, and aggregate quantities.
Frequently Asked Questions
Volume = Length × Width × Thickness, multiplied by the quantity of identical elements. All dimensions should be entered in meters to get the volume directly in cubic meters.
Real-world pours always lose some concrete to spillage, formwork leakage, and uneven excavation. A 5% wastage allowance is a commonly used rule of thumb to avoid running short mid-pour.
No, this calculator only gives you the total concrete volume. Feed that volume into the Cement Calculator with your mix ratio to get the exact cement bags, sand, and aggregate quantities.
Yes, it's completely free and requires no sign-up.