Question 1

How do I calculate concrete volume in m³?

Accepted Answer

Multiply length × width × depth in metres. For slabs: L(m) × W(m) × D(m). For depth in mm, divide by 1000. Always add 5-10% extra for wastage.

Question 2

How much does concrete cost per m³ in Australia?

Accepted Answer

Standard concrete costs $200-$350 per cubic metre delivered in Australia, depending on strength grade and location. 20MPa is cheapest, 32MPa and higher cost more. Minimum delivery charges may apply for small loads.

Question 3

How many bags of concrete mix per m³?

Accepted Answer

You need approximately 108 × 20kg bags of concrete mix per cubic metre. For a standard 20kg bag covering ~0.01m³, a 3m × 4m × 100mm slab (1.2m³) requires about 130 bags. Buying bulk ready-mix is cheaper for larger jobs.

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