How Much Concrete for a 20×30 Slab?

The answer

8.15 cubic yard

For a 20×30 ft slab at 4" depth, with 10% overage included. Estimated cost: $1,344 at US national average pricing.

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You need

—

cubic yard

Area: —
Volume: —
With 10% overage: —
Or in 60 lb bag: —
Estimated cost (US avg): —

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How we calculated this

1. Area: 20 × 30 = 600 sq ft
2. Volume: 600 × (4/12) = 200 cubic feet
3. Convert + overage: Add 10% for waste → 8.15 cubic yard
4. Cost: 8.15 × $165.00 ≈ $1,344

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