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Construction calculator
Concrete Volume Calculator
Work out how much ready-mix you need for slabs, strip and pad foundations, trenches, footings and circular columns. Add a wastage allowance, estimate truck loads and optionally cost the pour.
Read the guide: Concrete Volume Calculator.
Free to use. No registration required.
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How do I calculate concrete volume?
For rectangular pours such as slabs, trenches, strip foundations and pads, multiply length × width × depth. Convert all dimensions to metres first so the result is in cubic metres (m³). For a circular column use π × (diameter ÷ 2)² × height.
What wastage allowance should I use for concrete?
Most site teams add 5–10% wastage for spillage, over-excavation and uneven grounds. Enter your own percentage in this calculator, the total volume includes that allowance so you can order enough material.
How many concrete trucks do I need?
Divide the total volume including wastage by your mixer capacity (often around 6–8 m³). This calculator rounds up to whole truck loads so you do not under-order.
Can I estimate the cost of ready-mix concrete?
Yes. Enter a price per cubic metre and the tool multiplies it by the total volume including wastage. The figure is an estimate only and does not include labour, formwork, pumping, delivery surcharges or VAT unless those are already built into your unit price.
What is the difference between a slab, strip foundation and pad foundation?
A slab is a broad horizontal pour (floor or ground-bearing slab). A strip foundation is a continuous trench pour under a wall. A pad foundation is an isolated rectangular pad under a column or pier. The volume maths is the same rectangular formula; the mode mainly changes the field labels and guidance for site use.
How do I calculate concrete for a circular column?
Enter the column diameter and height. Volume = π × radius² × height. If you are pouring several identical columns, set the quantity and the calculator scales the volume accordingly.