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Concrete Slab Cost Calculator

Enter your slab size to get the concrete volume in cubic yards, how many 40/60/80 lb bags you'll need, and an estimated delivered ready-mix cost — including a waste allowance.

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Longer side.
Shorter side.
4″ typical for patios; 5–6″ for driveways.
Spillage, uneven subgrade. 10% standard.
2026 range ≈ $125–$175/yd³.

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Bags vs. ready-mix

FAQ

How many 80 lb bags make a cubic yard?

About 45 — a cubic yard is 27 cubic feet, and each 80 lb bag yields ~0.60 cubic feet.

Estimates for planning only. Confirm with your ready-mix supplier before ordering.

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