8x10 Concrete Slab, 4 Inches Thick
A 8 × 10 ft slab (80 sq ft) at 4 in thick takes about 1.09 cubic yards of concrete, with 10% extra for waste. For ready-mix, order 1.25 cu yd for the 8x10, about $235 – $335 delivered, short-load fee included. Bagged, the same 8x10 is 49 80 lb or 66 60 lb bags, about $330 – $462 for the concrete alone.
- Ready-mix order
- 1.25 cu yd
- Ready-mix cost
- $235 – $335
- 80 lb bags
- 49
- Bag cost
- $330 – $462
Materials only for a 8x10 at 4 in, from national price ranges as of 2026-09; not a live quote.
Common jobs for an 8x10 pad
Eighty square feet suits a lean-to or gable shed sold as 8x10, a compact bistro patio for a table and two chairs, or a dog-run floor that hoses clean.
Because 8 ft is the short side, an 8x10 shed door usually goes on the 10 ft wall so a mower can roll straight in; plan a small ramp or apron at that edge.
This size also works as a pad beside a garage for a kayak rack or firewood, where a flat, dry base keeps the stack off wet ground.
Before you pour the 8x10 at 4 in
- Decide which long side gets the door before you pour, and add a short apron there if a mower or cart rolls in.
- Slope a patio version 1/8 to 1/4 in per foot so water doesn't sit under the table.
- Compact the soil and base well: on a pad this small, one soft corner is easy to miss and shows quickly.
Full plan for a 8x10 slab, 4 in
- Area
- 80 sq ft
- Thickness
- 4 in
- Volume
- 1.09 cu yd
Bagged concrete estimate (DIY)
$407 – $588
Est. as of 2026-09 — not a live quote
Ready-mix delivered, incl. short-load fee (materials only)
$235 – $335
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 98 × 40 lb, 79 × 50 lb or 49 × 80 lb bags. 66 bags
- Ready-mix concrete Alternative to bagged mix; most suppliers have a 1 cu yd order minimum. 1.25 cu yd
- Compactable gravel sub-base 4 in compacted base beneath the slab. 1.33 tons
- 6x6 welded wire mesh Reinforcement for crack control; not a substitute for engineered rebar on structural slabs. 88 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: 4,400 lb (2.2 tons).
- Prices are national-average retail/delivery ranges as of 2026-09, not live quotes.
- Ready-mix orders under 10 cu yd usually carry a short-load fee; the ready-mix range includes a flat $60-$110. Some suppliers charge per yard instead, so ask for the full fee schedule.
Bags or ready-mix for a 8x10 slab, 4 in?
At 1.09 cu yd, the 8x10 sits where bagged concrete and ready-mix cross over in price. For the 8x10, 49 80 lb bags cost about $330 – $462, while 1.25 cu yd of ready-mix costs about $235 – $335, short-load fee included. For a 8x10 at 4 in the two price ranges overlap, so local prices decide it: get one quote for 1.25 cu yd of ready-mix and price 49 bags at your store.
Is 4 in thick enough for a 8x10 slab?
Foot traffic, patio furniture and a shed all sit fine on a 8x10 poured 4 in thick, the standard for slabs that don't carry vehicles.
Control joints for a 8x10 slab at 4 in
A 8x10 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 8x10 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.
No side of a 8x10 slab is longer than 10 ft, so at 4 in it can go without an interior joint. Tool one across the middle of the 8x10 anyway if you want a straight line for any crack to follow.
How much a 8x10 slab 4 in thick weighs
Wet concrete weighs about 150 lb per cubic foot, so the 8x10 pour is about 4,400 lb (2.2 tons). As bags, the 8x10 is 49 80 lb bags, 3,920 lb in all: about 3 trips in a pickup carrying 1,500 lb a load. For that many trips with the 8x10, check the payload on your truck's door-jamb sticker, or have the store deliver the pallets for a fee.
The 8x10 at 4 in against nearby sizes
Every row uses the same 10% waste and prices as the 8x10 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 |
|---|---|---|---|---|---|---|
| 8x8 slab, 4 in | 0.87 | 53 | 40 | 1 cu yd | $265 – $371 | $200 – $290 |
| 8x10 slab, 4 in (this page) | 1.09 | 66 | 49 | 1.25 cu yd | $330 – $462 | $235 – $335 |
| 10x10 slab, 4 in | 1.36 | 82 | 62 | 1.5 cu yd | $410 – $574 | $270 – $380 |
Questions about a 8x10 slab, 4 in
How many bags of concrete for a 8x10 slab 4 inches thick?
A 8x10 slab at 4 in takes about 49 80 lb bags or 66 60 lb bags (or 79 50 lb, 98 40 lb), with 10% added for waste: 29.3 cubic feet in all.
How many yards of concrete for a 8x10 slab 4 inches thick?
The 8x10 measures out at 0.99 cubic yards, or 1.09 with 10% for waste. Order 1.25 cu yd for the 8x10, since ready-mix is sold in quarter yards with a 1 yard minimum at most plants.
How much does a 8x10 concrete slab 4 inches thick cost?
Concrete alone for the 8x10 runs about $235 – $335 for 1.25 cu yd of ready-mix delivered, short-load fee included, or $330 – $462 for 66 60 lb bags. Add a 4 in gravel base and wire mesh and the bagged 8x10 plan comes to $407 – $588. Labor, forms and finishing for a 8x10 at 4 in come on top of these national ranges (as of 2026-09), which are not quotes.
How much does a 8x10 concrete slab 4 inches thick weigh?
About 4,400 lb (2.2 tons) of wet concrete for the 8x10, at 150 lb per cubic foot. The 49 80 lb bags for a 8x10 weigh 3,920 lb: about 3 trips in a pickup carrying 1,500 lb a load.
Where do control joints go on a 8x10 slab 4 inches thick?
On a 8x10 at 4 in, every 8 to 12 ft (24 to 36 times the thickness), sawn 1 in deep. No side of a 8x10 slab is longer than 10 ft, so at 4 in it can go without an interior joint. Tool one across the middle of the 8x10 anyway if you want a straight line for any crack to follow.
Limitations
The 8x10 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 8x10 slab with a qualified professional.