Concrete Slab Pour Cost Worksheet
Estimate a slab pour from approved area and thickness, then separate concrete supply, base, reinforcement, forms, placing, finish and curing. The page uses a disclosed $6 to $12 input to demonstrate project-size arithmetic; it is not a verified price benchmark.
Key takeaways
- Calculate concrete volume from the approved slab dimensions before requesting supply prices.
- Thickness, concrete specification, base, reinforcement and joints are project inputs, not cost-page recommendations.
- Compare bids that expose delivery, site preparation, forms, placing, finish, curing and cleanup.
- An 80 lb bag yielding 0.60 cubic feet gives 45 bags per cubic yard before allowance.
- The $6 to $12 rate is an illustrative calculation input to replace with local quotes.
Concrete slab cost from a local rate
Contractors often quote slab work per square foot, but the rate is meaningful only when the scope is defined. Confirm thickness, concrete specification, reinforcement, base, excavation, forms, finish, joints, access, delivery, permits and cleanup.
This page uses $6 to $12 per square foot only as an illustrative input. It is retained to show multiplication by project size, not presented as an observed price benchmark.
Illustrative budget = Slab area(ft2) × Assumed installed rateEnter dimensions in the concrete slab calculator for cubic yards and bag counts, then replace its optional price input with a current supplier quote.
Cost breakdown: materials, labor and site prep
Separate concrete, placement and finishing, and site preparation when comparing bids. A low headline rate can omit work another bid includes.
| Cost item | Quote detail to record |
|---|---|
| Ready-mix concrete | Mix specification, volume, delivery, minimum and short-load fee |
| Base and grading | Area, compacted depth, material and disposal |
| Reinforcement | Specified type, size, spacing, supports and laps |
| Forms and finish | Edges, surface finish, joints and curing |
| Excavation or demolition | Measured quantity, access, haulage and disposal |
Obtain each price from the supplier or contractor for the actual project. Product standards and technical guides do not establish local market prices.
Cost to pour a concrete slab by size
The table shows geometry at 4 inches with about 10% extra volume, plus an explicitly illustrative $6 to $12 per square foot calculation. Replace that rate with a local quote.
| Slab size | Square feet | Cubic yards (4 in, +10%) | Illustrative $6 to $12 calculation |
|---|---|---|---|
| 10 x 10 ft | 100 | 1.4 | $600 to $1,200 |
| 20 x 20 ft | 400 | 5.4 | $2,400 to $4,800 |
| 24 x 24 ft | 576 | 7.8 | $3,456 to $6,912 |
| 30 x 40 ft | 1,200 | 16.3 | $7,200 to $14,400 |
| 40 x 60 ft | 2,400 | 32.6 | $14,400 to $28,800 |
The volume allowance should match the supplier and site conditions. The slab calculator handles volume from actual dimensions and lets you enter a quoted material price.
For another worked geometry, see the 12x12 slab guide.
How thickness and reinforcement change the price
Apply current rates only to the measured slab quantities, mix, base, reinforcement, finish and access.
Thickness, concrete specification, reinforcement, base and joints are design inputs. Select them from the applicable plans and local requirements rather than a generic cost article.
ASTM A615 defines reinforcing-bar material requirements but does not decide whether a slab needs rebar, its size or spacing. Record the specified reinforcement and obtain a current supplier quote.
What makes prices vary by region
Material supply, travel, access, labor, permits and weather all vary by place and date. No unsupported national multiplier can replace local quotes.
Request at least two itemized bids against the same dimensions, concrete specification, reinforcement, base, finish, joints, curing and cleanup scope. Record the quote date and validity period.
If seasonal conditions affect placement, ask how heating, cooling, protection or scheduling changes the scope and price.
DIY vs hiring a contractor
Compare DIY and contractor options from current, itemized inputs: concrete or bagged mix, delivery, equipment, forms, reinforcement, base, finishing, curing, disposal, permits and labor.
The QUIKRETE Concrete Mix No. 1101 data sheet lists 0.60 cubic foot yield for an 80 lb bag. At that published yield, 27 / 0.60 = 45 bags per cubic yard before allowance. Obtain the bag price and ready-mix terms locally.
Placement and finishing capacity matter on a continuous pour. Discuss batch size and delivery timing with the supplier or contractor.
The concrete calculator converts dimensions into cubic yards and bag counts; its optional cost uses the price you enter.
Frequently asked questions
How much does it cost to pour a concrete slab per square foot?
How much does a 20x20 concrete slab cost?
How much does a 20x20 driveway cost?
How much does a 30x40 concrete slab cost?
How much does a 40x60 concrete slab cost 4 inches thick?
How should I compare self-performed and contractor slab budgets?
Sources and references
These references and structured source records support the method and material data used on this page.
- IRC 2021 Chapter 4: Foundations
- ASTM A615: Standard Spec for Carbon-Steel Bars (rebar)
- QUIKRETE Concrete Mix (product and yield data)
- Concrete (Wikipedia)