Calculate how much concrete you need for slabs, footings, columns and walls in cubic yards or metres.
A 10 ft × 10 ft slab at 4 inches deep needs about 1.24 cubic yards of concrete, or roughly 1.36 cubic yards with 10% waste.
About 60 standard 60 lb bags or 45 standard 80 lb bags make one cubic yard.
Yes – 5-10% for simple slabs and up to 15% for irregular shapes or footings with forms.
A typical garden or shed slab is 100 mm (4 in); driveways and areas taking vehicles usually need 150 mm (6 in) with reinforcement.
For small jobs bagged or site-mixed concrete is usually cheaper; for more than about a cubic metre, ready-mix delivery is often better value and faster.
Work out the cement, sand and aggregate (ballast) quantities for a concrete mix by volume and ratio.
OpenCalculate the concrete volume and number of bags needed for strip, pad and pier footings.
OpenEstimate the total cost of concrete for a slab, footing or footpath from the volume and your price per cubic yard or metre.
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