30x60 Concrete Slab, 4 Inches Thick
A 30 × 60 ft slab (1,800 sq ft) at 4 in thick takes about 24.44 cubic yards of concrete, with 10% extra for waste. For ready-mix, order 24.5 cu yd for the 30x60, about $3,430 – $4,410 delivered. Bagged, the same 30x60 is 1,100 80 lb or 1,467 60 lb bags, about $7,335 – $10,269 for the concrete alone.
- Ready-mix order
- 24.5 cu yd
- Ready-mix cost
- $3,430 – $4,410
- 80 lb bags
- 1,100
- Bag cost
- $7,335 – $10,269
The 30x60 (4 in) prices are national material ranges as of 2026-09, not a quote from a supplier.
What a 30x60 slab is built for
A 30x60 slab carries a large pole barn or shop: RV and boat storage along one side, a workshop at one end, or a hobby farm's equipment shed.
At 1,800 sq ft, it is several trucks of concrete, usually placed with a pump or a conveyor and finished by a full crew, sometimes over two days.
Barndominium builders use this footprint too, and a slab under a living space needs a vapor retarder and, in colder places, insulation at the edges per the energy code.
Before you pour the 30x60 at 4 in
- If any part will be living space, plan the vapor retarder and edge insulation with the building department.
- Lay out plumbing for a bathroom or a utility sink before the base goes down.
- Plan the pour sequence and the construction joints with the crew.
Full plan for a 30x60 slab, 4 in
- Area
- 1,800 sq ft
- Thickness
- 4 in
- Volume
- 24.44 cu yd
Bagged concrete estimate (DIY)
$9,078 – $13,107
Est. as of 2026-09 — not a live quote
Ready-mix delivered (materials only)
$3,430 – $4,410
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 2,200 × 40 lb, 1,760 × 50 lb or 1,100 × 80 lb bags. 1,467 bags
- Ready-mix concrete Alternative to bagged mix; most suppliers have a 1 cu yd order minimum. 24.5 cu yd
- Compactable gravel sub-base 4 in compacted base beneath the slab. 30 tons
- 6x6 welded wire mesh Reinforcement for crack control; not a substitute for engineered rebar on structural slabs. 1,980 sq ft
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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: 99,000 lb (49.5 tons).
- Prices are national-average retail/delivery ranges as of 2026-09, not live quotes.
Bags or ready-mix for a 30x60 slab, 4 in?
24.5 cu yd for the 30x60 is 4 truckloads at 8 cu yd each (the conservative end of the 8 to 10 a truck carries), about $3,430 – $4,410. 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 1,800 sq ft at 4 in, and ask about a pump if the truck can't reach every corner of the 30x60. On the 30x60, ready-mix comes out cheaper by about $4,882 at the middle of each range, and it saves mixing 1,100 bags.
Is 4 in thick enough for a 30x60 slab?
Many residential garage floors the size of this 30x60 are poured 4 in thick, which clears the IRC minimum of 3-1/2 in for cars and light trucks. Go to 5 or 6 in if the 30x60 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 30x60 takes about 36.67 cu yd.
Control joints for a 30x60 slab at 4 in
A 30x60 slab at 4 in shrinks as it cures, and without joints it cracks wherever it chooses. ACI and PCA guidance spaces joints 24 to 36 times the thickness, which for this 30x60 at 4 in is every 8 to 12 ft, sawn 1 in deep (a quarter of the slab) once the surface holds up to the blade, usually within a day.
On the 30x60 at 4 in, a joint every 10 ft or less means 5 joints across the 60 ft side and 2 joints across the 30 ft side: 18 panels of about 10 × 10 ft and 270 ft of saw cut. The 30x60 is 2 times as long as it is wide, and long, narrow slabs crack across their width, so don't skip its cross joints.
How much a 30x60 slab 4 in thick weighs
Wet concrete weighs about 150 lb per cubic foot, so the 30x60 pour is about 99,000 lb (49.5 tons). As bags, the 30x60 is 1,100 80 lb bags, 88,000 lb in all: about 59 trips in a pickup carrying 1,500 lb a load. Nobody hauls 88,000 lb of bags for a 30x60 in a pickup; it comes by ready-mix truck or as pallets on a delivery truck.
The 30x60 at 4 in against nearby sizes
Every row uses the same 10% waste and prices as the 30x60 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 |
|---|---|---|---|---|---|---|
| 40x40 slab, 4 in | 21.73 | 1,304 | 978 | 21.75 cu yd | $6,520 – $9,128 | $3,045 – $3,915 |
| 30x60 slab, 4 in (this page) | 24.44 | 1,467 | 1,100 | 24.5 cu yd | $7,335 – $10,269 | $3,430 – $4,410 |
| 40x50 slab, 4 in | 27.16 | 1,630 | 1,223 | 27.25 cu yd | $8,150 – $11,410 | $3,815 – $4,905 |
Questions about a 30x60 slab, 4 in
How many bags of concrete for a 30x60 slab 4 inches thick?
A 30x60 slab at 4 in takes about 1,100 80 lb bags or 1,467 60 lb bags (or 1,760 50 lb, 2,200 40 lb), with 10% added for waste: 660 cubic feet in all.
How many yards of concrete for a 30x60 slab 4 inches thick?
The 30x60 measures out at 22.22 cubic yards, or 24.44 with 10% for waste. Order 24.5 cu yd for the 30x60, since ready-mix is sold in quarter yards with a 1 yard minimum at most plants.
How much does a 30x60 concrete slab 4 inches thick cost?
Concrete alone for the 30x60 runs about $3,430 – $4,410 for 24.5 cu yd of ready-mix delivered, or $7,335 – $10,269 for 1,467 60 lb bags. Add a 4 in gravel base and wire mesh and the bagged 30x60 plan comes to $9,078 – $13,107. Labor, forms and finishing for a 30x60 at 4 in come on top of these national ranges (as of 2026-09), which are not quotes.
How much does a 30x60 concrete slab 4 inches thick weigh?
About 99,000 lb (49.5 tons) of wet concrete for the 30x60, at 150 lb per cubic foot. The 1,100 80 lb bags for a 30x60 weigh 88,000 lb: about 59 trips in a pickup carrying 1,500 lb a load.
Where do control joints go on a 30x60 slab 4 inches thick?
On a 30x60 at 4 in, every 8 to 12 ft (24 to 36 times the thickness), sawn 1 in deep. On the 30x60 at 4 in, a joint every 10 ft or less means 5 joints across the 60 ft side and 2 joints across the 30 ft side: 18 panels of about 10 × 10 ft and 270 ft of saw cut.
Limitations
The 30x60 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 30x60 slab with a qualified professional.