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How Much Concrete for a 20x24 Slab?
A 20 × 24 ft slab at 4 in thick needs 6.52 yd³ (176 ft³ · 4.98 m³ incl. 10% waste).
How Much Concrete for a 20x24 Slab?
Concrete needed176 ft³ · 4.98 m³ incl. 10% waste
80 lb bags (0.60 ft³ each)
294
60 lb bags (0.45 ft³ each)
392
40 lb bags (0.30 ft³ each)
587
Ready-mix trucks (~9 yd³)
0.7
Ready-mix suppliers usually sell in ¼ or ½ yd³ steps with a minimum order. Slabs on grade are typically 4 in for patios/walks and 5–6 in for driveways.
Planning estimates only. Building codes, loads and material specs vary — have a licensed engineer or contractor confirm quantities and safety requirements. Disclaimer
By thickness
- 4 in: 6.52 yd³
- 5 in: 8.15 yd³
- 6 in: 9.78 yd³
- 8 in: 13.04 yd³
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