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Concrete for common slab sizes

Concrete volume is length × width × depth. The table adds 10% for waste and uses about 108 × 20 kg premix bags per cubic metre. For more than about 1 m³, a truck delivery is usually the better choice.

Slab	Depth	Volume	With 10% waste	20 kg bags
1 × 1 m	100 mm	0.10 m³	0.11 m³	12
2 × 2 m	100 mm	0.40 m³	0.44 m³	48
3 × 3 m	100 mm	0.90 m³	0.99 m³	107
4 × 3 m	100 mm	1.20 m³	1.32 m³	143
6 × 4 m	100 mm	2.40 m³	2.64 m³	286
6 × 6 m	100 mm	3.60 m³	3.96 m³	428
10 × 6 m	100 mm	6.00 m³	6.60 m³	713
6 × 4 m	125 mm	3.00 m³	3.30 m³	357
10 × 10 m	100 mm	10.00 m³	11.00 m³	1188

Concrete calculator

Estimates only. Check sizes, coverage and quantities with your supplier, engineer or certifier before ordering. Standards references are a guide, not compliance advice.