Concrete Calculator
Order the right amount of concrete. Enter the dimensions of your slab or column to get the volume needed, with room for waste.
How it works
- 1
Choose the shape
Slab (length, width, depth) or column (diameter, height).
- 2
Enter dimensions
In the unit system you prefer.
- 3
Add quantity and waste
How many pours and an allowance for spillage.
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Frequently asked questions
Around 10% is a common default; rougher or more irregular sites may need more.
How concrete volume is calculated
For a slab, volume = length × width × depth. For a column, volume = π × (diameter ÷ 2)² × height. The calculator converts to cubic yards or cubic meters, whichever your supplier uses.
Always add a waste allowance — 10% is typical — to cover uneven subgrade, spillage and small measurement errors, so you do not run short mid-pour.