10 × 12 ft slab: the short answer
Poured 4 inches thick (with 10% waste), a 10 × 12 ft slab needs about 44.0 cubic feet of concrete — roughly 74 × 80 lb bags, or about 1.63 cubic yards of ready-mix.
Slab size
Concrete for a 10 × 12 ft slab
A 10 × 12 ft slab poured 4 inches thick needs about 44.0 cubic feet of concrete — roughly 74 × 80 lb bags, or 1.63 cubic yards of ready-mix (includes 10% waste). Change the thickness, bag size, or shape below.
Concrete needed
—Enter dimensions to estimate concrete.
| Bags (incl. waste) | — |
|---|---|
| Ready-mix (cubic yards) | — |
| Volume (cubic feet) | — |
| Estimated cost | — |
Estimate only.
Includes your waste allowance (concrete can't be reused). Bag yields are typical for standard
mixes; confirm on the bag. Past about 1 cubic yard, ready-mix delivery is usually cheaper and
easier than mixing bags.
Before you pour
Concrete can't be reused once mixed, so the 10% allowance matters. For anything structural, confirm thickness and reinforcement with your local code. Adjust thickness and bag size in the calculator for your exact pour.
Standard volume math at 4″ with 10% waste; 80 lb bag ≈ 0.6 cu ft. Estimates only.
FAQ
How much concrete for a 10 × 12 ft slab?
At 4 inches thick with 10% waste, a 10 × 12 ft slab needs about 44.0 cubic feet — roughly 74 × 80 lb bags (or 98 × 60 lb), or 1.63 cubic yards of ready-mix.
Bags or ready-mix for a 10 × 12 ft slab?
At about 1.63 cubic yards, this slab is past the point where bags make sense — 74 bags is a lot of mixing. Ready-mix delivery is usually cheaper and lets you pour it all at once.
Estimate only, based on standard volume math at 4″ thickness with 10% waste. Confirm bag yield on the package and consult a pro for structural work.