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Concrete Calculator

How much concrete (and how many bags) a slab, pad, or footing needs.

ft
ft
in
$
Concrete needed
1.48 yd³
40 cubic feet for a 12′ × 10′ × 4″ slab
Volume40 ft³
80 lb bags (with 10% waste)11
Estimated cost (ready-mix)$237.04

An 80 lb bag covers roughly 4 ft³ (≈ 12 sq ft at 4″ depth). Add 10% for waste when ordering.

About the Concrete Calculator

How much concrete (and how many bags) a slab, pad, or footing needs.

It runs entirely in your browser — nothing you type is sent to a server — and the result updates as you edit the inputs. Estimates are for educational and informational purposes only; see ourdisclaimer.

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