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 | — |
Shopping list
Run the calculator to prepare a list.
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.
What a 10 × 12 ft slab is usually used for
A 10 × 12 ft slab suits a small shed, a patio extension, or a compact work area. At 120 sq ft it takes about 1.5 cubic yards of concrete, which is solidly in ready-mix territory for most projects, though ambitious hand-mixers could still do it in several batches.
How to decide
The bag-versus-truck decision is the main planning step at this size. Ready-mix requires access and timing, while bags spread the work over hours but risk cold joints between batches. If you hand-mix, plan the batches so each one butts against the previous pour before it sets, and keep the mix consistent.
Checks before you pour
- Confirm what the slab supports; a shed may have specific base requirements.
- Plan for a continuous pour whether by truck or sequential batches.
- Check subgrade drainage so water does not undermine the slab edges.
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.
Sources & verification
Source links and page assumptions reviewed .
- QUIKRETE: quantity calculator — Manufacturer quantity calculator and bag-yield guidance for concrete mixes.
- QUIKRETE: concrete mix data sheet — States an 80 lb bag of concrete mix yields about 0.6 cu ft at recommended consistency.
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.