Cost guide · Concrete
How much concrete for a 10x10 slab, 4 inches thick?
A 10 × 10 ft slab 4 in thick is 33.33 cu ft, or 1.23 cubic yards. With 10% extra for spillage and an uneven base, plan on 36.67 cu ft: 62 bags of 80 lb mix ($403.00) or 82 bags of 60 lb mix ($430.50). From a ready-mix plant the order is 1.5 cu yd, $262.50 before delivery and short-load charges.
Prices Ballpark U.S. home-center figures, not quotes. Default price list reviewed . Enter local prices in the calculator for a tighter number.
Materials takeoff
How much concrete for a 10x10 slab, 4 inches thick? · https://estimahome.com/guides/concrete-10x10-slab-4-inch/
Pour: Slab (rectangle)Slab length: 10 ftSlab width: 10 ftSlab thickness: 4 in
- Volume
- 33.33 cu ft · 1.23 cu yd
- With extra
- 36.67 cu ft · 1.36 cu yd
- 80 lb bags
- 62
- 60 lb bags
- 82
| No. | Item | Qty | Unit | Unit cost | Amount |
|---|---|---|---|---|---|
| 1 | Concrete mix, 80 lb | 62 | bag | $6.50 | $403.00 |
- Subtotal
- $403.00
- Likely range
- $342.55 – $463.45
| No. | Item | Qty | Unit | Unit cost | Amount |
|---|---|---|---|---|---|
| 2 | Concrete mix, 60 lb | 82 | bag | $5.25 | $430.50 |
- Subtotal
- $430.50
- Likely range
- $365.93 – $495.08
| No. | Item | Qty | Unit | Unit cost | Amount |
|---|---|---|---|---|---|
| 3 | Ready-mix concrete | 1.5 | cu yd | $175.00 | $262.50 |
- Subtotal
- $262.50
- Likely range
- $223.13 – $301.88
- Ready-mix plants often add delivery and short-load charges for small orders.
- Not included: gravel base, rebar or mesh, form boards.
Buy these materials
Pick one bag size. Ready-mix is ordered from a local plant.
- 62 80 lb bags of concreteAmazon search for 80 lb bags of concrete (opens in new tab)
- 82 60 lb bags of concreteAmazon search for 60 lb bags of concrete (opens in new tab)
Links open a store search for each item. Check sizes and grades against your plan.
Open the concrete calculator with these inputsChange any measurement, assumption or price and the takeoff updates.
How the numbers work
- Volume: 10 × 10 × 4 ÷ 12 = 33.33 cu ft.
- Cubic yards: 33.33 ÷ 27 = 1.23 cu yd.
- Order volume: 33.33 × 1.1 = 36.67 cu ft (1.36 cu yd).
- 80 lb bags: 36.67 ÷ 0.6 cu ft per bag, rounded up = 62 bags.
- 60 lb bags: 36.67 ÷ 0.45 cu ft per bag, rounded up = 82 bags.
- Ready-mix: 1.36 cu yd rounded up to the next ¼ yd = 1.5 cu yd.
Comparison
| Thickness | Cu yd | 80 lb bags | Bag cost | Ready-mix |
|---|---|---|---|---|
| 4 in | 1.23 | 62 | $403.00 | 1.5 yd |
| 5 in | 1.54 | 77 | $500.50 | 1.75 yd |
| 6 in | 1.85 | 92 | $598.00 | 2.25 yd |
Each row is a separate run of the Concrete Calculator at default prices. The highlighted row is the project above.
What changes the cost
- Bags or a truck
- 62 bags of 80 lb mix is 2.48 tons of dry mix to lift, mix and place. Past about one cubic yard, hand mixing gets hard to finish before the first batches set. Rent a mixer and line up help, or call a plant.
- Short-load fees
- Plants price by the yard and often add a fee for small loads. Ask for the delivered price of 1.5 yd, not the per-yard rate alone.
- Thickness
- 4 in is standard for patios, walks and shed floors. Slabs that carry vehicles are usually 5 to 6 in with reinforcement. Going to 6 in raises this slab to 92 bags.
- Base, forms and steel
- Not counted: form boards and stakes, wire mesh or rebar, and the gravel base. A 4 in gravel base under 10 × 10 ft is 1.23 cu yd before compaction.
- Waste factor
- 10% extra covers spillage, a low spot in the base and forms that bow. Running short mid-pour leaves a cold joint; a few leftover bags store fine.
- Labor versus DIY
- These are register prices for doing the work yourself. A contractor's bid adds labor, equipment, overhead, permit fees where they apply, and markup on materials, so it will run well above this figure. Get two or three written bids against the same plan and compare the material lists line by line. Finishing is the skilled part of a slab: screeding, floating, edging, control joints and the broom finish all happen on the concrete's schedule.
- Regional prices
- Default prices are ballpark U.S. home-center figures. Expect them to differ by region, season, brand and grade. Enter your store's prices in the calculator and every quantity on this page reprices.
Questions
How many 80 lb bags of concrete in a yard?
45 bags at 0.6 cu ft per bag. For 60 lb bags at 0.45 cu ft, 60 bags. The yield is printed on the bag.
Is it cheaper to use bags or ready-mix for a 10x10 slab?
At the default prices, ready-mix is $262.50 for 1.5 yd and bags are $403.00. The plant's delivery and short-load fees decide it, so get the delivered price before you buy bags.
How long does a 4 inch slab take to cure?
Concrete is usually firm enough to walk on in a day or two and reaches most of its design strength in about 28 days. Keep it damp or covered for the first week, and check the bag for the product's own times.
Figures computed with the Concrete Calculator and the default price list (/api/prices.json, reviewed October 20, 2026). Quantities are rounded up to what stores sell. Updated 2026-10-20.