Concrete calculator
Estimate slab volume and bags from the product yield.
Shopping estimate
Enter your measurements to see an estimate.
How it works
Multiply the area by the depth, then add the allowance. Divide by the yield printed on the bag to estimate whole bags.
Worked example
A 4 × 5 m slab at 10 cm thick needs 2 m³, or 2.2 m³ with a 10% allowance.
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