Concrete Volume Calculator
Estimate concrete for slabs, footings, walls, columns or circular elements and add an explicit waste allowance.
Calculate concrete volume
Estimate concrete for slabs, footings, walls, columns or circular elements and add an explicit waste allowance.
How the concrete volume calculator works
Rectangular volume is length × width × depth. Cylindrical volume is π × radius² × height. The element count multiplies net volume, and the waste percentage is applied afterward.
Where this construction calculation helps
Use it for slabs, strip footings, pads, walls, columns and other simple shapes before ordering ready-mix or estimating site batching.
Measurements and assumptions
Use finished internal dimensions in metres. Irregular excavations, slopes, rebates, embedded voids and uneven subgrade should be broken into smaller shapes or measured with a more detailed takeoff. Waste is project-specific.
Worked example
A 5 m × 4 m slab at 150 mm thick contains 3.0 m³ net concrete; adding 5% allowance gives 3.15 m³.
Before placing an order
Compare the calculated quantity with drawings, site measurements and supplier minimum loads. Openings, thickened edges, steps and irregular foundations may need separate calculations. Ready-mix orders are commonly placed in supplier-specific increments, so round only after confirming the delivery rules and the project's tolerance for leftover concrete.