Concrete Calculator
Calculate concrete volume for slabs, footings, columns and circular slabs.
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Order the right amount of concrete, every time
Choose your shape — slab, footing, round column or circular slab — enter the dimensions, and get the volume in cubic metres and cubic yards, plus an estimated bag count if you're using bagged mix.
This tool provides quantity estimates only and does not replace engineering advice. For structural pours, always confirm depth, reinforcement and mix design with a qualified engineer.
How to use it
- Select the shape that matches your pour.
- Enter dimensions in whatever unit is easiest — mix and match mm, cm, m, inches, feet or yards.
- Add a wastage allowance and, if using bags, the yield per bag from the packaging.
The formulas
Worked example
A 4m × 3m slab at 100mm thick is 1.2 m³. With 5% wastage that's 1.26 m³ — about 1.65 cubic yards, or roughly 147 bags at 0.0086 m³ per bag.
Frequently Asked Questions
Does this account for reinforcement or engineering requirements?
No. This is a quantity estimate only — always confirm depth, reinforcement (mesh/rebar) and mix design with a qualified engineer for structural work.
How much wastage should I allow for concrete?
5% is a common allowance for formed pours. Increase it for uneven ground, hand-mixing, or pours where over-ordering is expensive to fix.
What if I'm using ready-mix instead of bags?
Use the cubic metre or cubic yard figure directly with your ready-mix supplier — the bag count is only relevant if you're using bagged mix.