40x60 Concrete Slab, 4 Inches Thick
A 40 × 60 ft slab (2,400 sq ft) at 4 in thick takes about 32.59 cubic yards of concrete, with 10% extra for waste. For ready-mix, order 32.75 cu yd for the 40x60, about $4,585 – $5,895 delivered. Bagged, the same 40x60 is 1,467 80 lb or 1,956 60 lb bags, about $9,780 – $13,692 for the concrete alone.
- Ready-mix order
- 32.75 cu yd
- Ready-mix cost
- $4,585 – $5,895
- 80 lb bags
- 1,467
- Bag cost
- $9,780 – $13,692
The 40x60 (4 in) prices are national material ranges as of 2026-09, not a quote from a supplier.
The 40x60 shop or barndominium slab
Forty by sixty is the classic large shop and barndominium footprint: 2,400 sq ft that can split into a living area and a shop, or hold an RV, boats and vehicles.
For a barndominium, the living side needs a vapor retarder under the slab and often edge insulation under the energy code, and its plumbing must be laid out before the pour.
A floor this size is placed by a contractor with a pump or a laser screed, usually in sections, with control joints about every 10 ft at 4 in thick.
A 4 in 40x60 pour: check first
- Fix the floor plan, especially the bathrooms and kitchen, before any plumbing goes in the ground.
- Ask the contractor about pouring the living side and the shop side on separate days.
- Consider 5 to 6 in for the shop bays if heavy vehicles or a lift are planned.
Full plan for a 40x60 slab, 4 in
- Area
- 2,400 sq ft
- Thickness
- 4 in
- Volume
- 32.59 cu yd
Bagged concrete estimate (DIY)
$12,104 – $17,476
Est. as of 2026-09 — not a live quote
Ready-mix delivered (materials only)
$4,585 – $5,895
Est. as of 2026-09 — not a live quote
For a pour this size, ready-mix delivery is typically more practical than mixing bags by hand.
Shopping list
- Concrete mix (60 lb bags) Or 2,934 × 40 lb, 2,347 × 50 lb or 1,467 × 80 lb bags. 1,956 bags
- Ready-mix concrete Alternative to bagged mix; most suppliers have a 1 cu yd order minimum. 32.75 cu yd
- Compactable gravel sub-base 4 in compacted base beneath the slab. 40 tons
- 6x6 welded wire mesh Reinforcement for crack control; not a substitute for engineered rebar on structural slabs. 2,640 sq ft
Email me this plan
Get the shopping list, cost range and next steps in your inbox, to have at the store or when you talk to a contractor. Free.
You need about 32.8 cubic yards of ready-mix concrete. Want local delivered prices?
Get delivered pricesFree · no obligation · any prices come from local suppliers, not us.
Buy bagged concrete
Pick up bagged mix and reinforcement from a hardware store for smaller pours.
View shopping listAssumptions
- Waste allowance: 10% applied to account for over-excavation and spillage.
- Approx. wet weight: 132,000 lb (66 tons).
- Prices are national-average retail/delivery ranges as of 2026-09, not live quotes.
Bags or ready-mix for a 40x60 slab, 4 in?
32.75 cu yd for the 40x60 is 5 truckloads at 8 cu yd each (the conservative end of the 8 to 10 a truck carries), about $4,585 – $5,895. Ask the supplier to space the trucks so each load goes down before the last one stiffens (a wet edge), line up enough hands to place and finish 2,400 sq ft at 4 in, and ask about a pump if the truck can't reach every corner of the 40x60. Ready-mix wins for this 40x60 by roughly $6,496 (range midpoints), and nobody has to mix 1,467 bags by hand.
Is 4 in thick enough for a 40x60 slab?
For a 40x60 garage or shop floor that carries passenger cars, 4 in is common and above the IRC minimum of 3-1/2 in. Go to 5 or 6 in if the 40x60 will hold heavy pickups, an RV, a car lift or a tractor, or sits on soft or clay soil, and check your local code first. At 6 in the same 40x60 takes about 48.89 cu yd.
Control joints for a 40x60 slab at 4 in
A 40x60 slab at 4 in shrinks as it cures, and without joints it cracks wherever it chooses. The usual rule (ACI and PCA guidance) puts joints in a 40x60 at 4 in every 8 to 12 ft, 24 to 36 times the thickness, cut 1 in deep (a quarter of the thickness) as soon as the surface takes the saw without raveling, usually within the first day.
On the 40x60 at 4 in, a joint every 10 ft or less means 5 joints across the 60 ft side and 3 joints across the 40 ft side: 24 panels of about 10 × 10 ft and 380 ft of saw cut.
How much a 40x60 slab 4 in thick weighs
Wet concrete weighs about 150 lb per cubic foot, so the 40x60 pour is about 132,000 lb (66 tons). As bags, the 40x60 is 1,467 80 lb bags, 117,360 lb in all: about 79 trips in a pickup carrying 1,500 lb a load. Nobody hauls 117,360 lb of bags for a 40x60 in a pickup; it comes by ready-mix truck or as pallets on a delivery truck.
The 40x60 at 4 in against nearby sizes
Every row uses the same 10% waste and prices as the 40x60 at 4 in; costs are for the concrete only.
| Slab | Cu yd | 60 lb bags | 80 lb bags | Ready-mix order | Bags cost | Ready-mix cost |
|---|---|---|---|---|---|---|
| 40x50 slab, 4 in | 27.16 | 1,630 | 1,223 | 27.25 cu yd | $8,150 – $11,410 | $3,815 – $4,905 |
| 40x60 slab, 4 in (this page) | 32.59 | 1,956 | 1,467 | 32.75 cu yd | $9,780 – $13,692 | $4,585 – $5,895 |
| 50x50 slab, 4 in | 33.95 | 2,038 | 1,528 | 34 cu yd | $10,190 – $14,266 | $4,760 – $6,120 |
Questions about a 40x60 slab, 4 in
How many bags of concrete for a 40x60 slab 4 inches thick?
Plan on 880 cubic feet for the 40x60, which is 1,467 80 lb bags, 1,956 60 lb bags, 2,347 50 lb or 2,934 40 lb bags once 10% waste is in.
How many yards of concrete for a 40x60 slab 4 inches thick?
32.59 cubic yards with waste (29.63 without) for a 40x60 at 4 in. Round the 40x60 order to 32.75 cu yd: plants batch in quarter yards and most won't send less than a yard.
How much does a 40x60 concrete slab 4 inches thick cost?
Concrete alone for the 40x60 runs about $4,585 – $5,895 for 32.75 cu yd of ready-mix delivered, or $9,780 – $13,692 for 1,956 60 lb bags. Add a 4 in gravel base and wire mesh and the bagged 40x60 plan comes to $12,104 – $17,476. Labor, forms and finishing for a 40x60 at 4 in come on top of these national ranges (as of 2026-09), which are not quotes.
How much does a 40x60 concrete slab 4 inches thick weigh?
About 132,000 lb (66 tons) of wet concrete for the 40x60, at 150 lb per cubic foot. The 1,467 80 lb bags for a 40x60 weigh 117,360 lb: about 79 trips in a pickup carrying 1,500 lb a load.
Where do control joints go on a 40x60 slab 4 inches thick?
On a 40x60 at 4 in, every 8 to 12 ft (24 to 36 times the thickness), sawn 1 in deep. On the 40x60 at 4 in, a joint every 10 ft or less means 5 joints across the 60 ft side and 3 joints across the 40 ft side: 24 panels of about 10 × 10 ft and 380 ft of saw cut.
Limitations
The 40x60 figures at 4 in are material estimates and typical price ranges, not a quote or a structural design. Confirm that 4 in, the reinforcement and the joint layout suit your soil, loads and local code for a 40x60 slab with a qualified professional.