Concrete calculator
Work out how much concrete to order for a slab, strip footing or round pier, with waste added and the volume rounded to a truck order.
Your measurements
How it's worked out
Volume = length × width × depth (or π × r² × height for columns) × number of pours, plus waste. Truck orders round up to the nearest 0.2 m³. Bags assume about 108 × 20 kg premix bags per m³.
Estimates only. Check sizes, coverage and quantities with your supplier, engineer or certifier before ordering. Standards references are a guide, not compliance advice.
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