How many bags of concrete for a 10×10 slab?
A 10 × 10 ft slab 4 inches thick takes 1.23 cubic yards of concrete (33.3 cubic feet): 56 bags of 80 lb before waste, or 62 bags with 10% extra. In 60 lb bags that is 82 with the extra.
How to work it out
- 10 ft × 10 ft × 4 in = 33.3 cu ft = 1.23 cu yd
- 33.3 cu ft ÷ 0.6 cu ft per bag = 56 bags before extra
- + 10% = 1.36 cu yd ÷ 0.6 cu ft = 62 bags
A 10 × 10 slab is the classic small pour: a patio for a table and grill, a hot-tub pad or a floor for an 8 × 10 shed with a little apron. It is also right at the size where bags stop being the obvious choice, because 1.23 cubic yards means about 60 heavy bags to lift, mix and place before the first batch starts to stiffen.
Adjust for your project
More options: Extra · Price
- Bags before the extra
- 56 bags · 80 lb (≈ 0.60 cu ft)
- Concrete incl. extra
- 1.36 cu yd (36.7 cu ft)
- Concrete before the extra
- 1.23 cu yd (33.3 cu ft)
- Bags of this size per cubic yard
- 45 bags
- Weight of the bags
- 4,960 lb
- Cut control joints about 1 in deep every 6–8 ft (Quikrete’s guidance) so the slab cracks along straight lines instead of at random.
- Past about a cubic yard, price ready-mix delivery too (ask about small-load minimums), or at least rent a drum mixer: mixing that many bags by hand is a long, heavy day.
Bags for a 10×10 slab, 4 in thick, by bag size (incl. 10% extra)
| Bag size | Bags of concrete (incl. extra) | Bags before the extra | Weight of the bags |
|---|---|---|---|
| 0.3 cu ft | 123 bags | 112 bags | 4,920 lb |
| 0.375 cu ft | 98 bags | 89 bags | 4,900 lb |
| 0.45 cu ft | 82 bags | 75 bags | 4,920 lb |
| 0.6 cu ft | 62 bags | 56 bags | 4,960 lb |
What to know about a 10×10 concrete slab
Check what your forms actually give you. A slab formed with 2×4s on edge is 3½ in thick, not 4, because a 2×4 is really 1½ × 3½ in; that saves about eight bags here (see the variants). If you want a true 4 in slab, use 2×6 forms and set the gravel base so the top of the gravel sits 4 in below the top of the form.
Sixty-two 80 lb bags weigh close to 5,000 lb — more than most pickups can carry in one trip, and about 46 gallons of mixing water at Quikrete’s starting rate. With a rented drum mixer and two people, plan to mix and place in batches without long gaps; a pour that sits half-finished in the sun leaves a weak seam.
Quikrete recommends control joints every 6–8 ft, so a 10 × 10 slab gets one joint each way, splitting it into four 5 ft squares. Cut them about 1 in deep with a groover while the concrete is still soft.
Under the slab, most builders put about 4 in of compacted gravel; how much gravel for a 10×10 area gives that figure. And before you start, price a ready-mix short load against the bags: see how many bags of concrete in a cubic yard for where the two meet.
Different size? Use the full Concrete Bag Calculator.
What you’ll need
- Magnesium floatBudget price
Smooths and closes the surface of a small slab or pad after screeding. A hand float is enough for pads up to a few feet across.
See options on Amazon (opens in a new tab) - Wheelbarrow (6 cu ft class)Mid-range price
Most home wheelbarrows hold 4–6 cubic feet — so a cubic yard of mulch is five or six trips. Two wheels are steadier on soft ground.
See options on Amazon (opens in a new tab) - Hand tamper (8 × 8 in or 10 × 10 in)Budget price
Compacts gravel in small areas and along edges where a rented plate compactor won’t reach. For a whole patio base, rent the plate compactor.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
How many 60 lb bags of concrete for a 10×10 slab?
About 82 bags of 60 lb for a 4 inch slab with 10% extra (75 bags before waste). Lighter to lift, but a third more bags to mix.
How many bags of concrete for a 10×10 slab 6 inches thick?
About 92 bags of 80 lb (2.04 cubic yards with 10% extra). At that volume, ready-mix is usually the easier option.
How many bags of concrete for a 10×10 slab formed with 2×4s?
A 2×4 form gives a slab 3½ inches thick: about 54 bags of 80 lb with 10% extra, or 49 bags before waste.
Other common sizes
Sources
- Quikrete Concrete Mix (No. 1101) data sheet (opens in a new tab) — Yields: 40 lb ≈ 0.30, 50 lb ≈ 0.375, 60 lb ≈ 0.45, 80 lb ≈ 0.60 cu ft; 2 in minimum; control joints every 6–8 ft; water per bag
- Quikrete Fast-Setting Concrete Mix (No. 1004) data sheet (opens in a new tab) — Metric yields: 25 kg ≈ 11.6 L, 30 kg ≈ 14 L