Materials (25–32%)
Concrete delivery ($125–$175/cubic yard), rebar/wire mesh, gravel base, vapor barrier
Free Concrete Slab Cost Estimate
Concrete Slab Cost Calculator
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Get estimates by slab size, project type, and region — with material, labor, and site prep ranges you can take to a contractor.
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Concrete Slab Costs by Size
| Slab Size | Area | Basic (4") | Driveway (5") | Garage (6") |
|---|---|---|---|---|
| 10×10 ft | 100 sq ft | $600 – $1,200 | $700 – $1,300 | $800 – $1,500 |
| 12×12 ft | 144 sq ft | $860 – $1,730 | $1,010 – $1,870 | $1,150 – $2,160 |
| 20×20 ft | 400 sq ft | $2,400 – $4,800 | $2,800 – $5,200 | $3,200 – $6,000 |
| 20×30 ft | 600 sq ft | $3,600 – $7,200 | $4,200 – $7,800 | $4,800 – $9,000 |
| 30×40 ft | 1,200 sq ft | $7,200 – $14,400 | $8,400 – $15,600 | $9,600 – $18,000 |
| 40×40 ft | 1,600 sq ft | $9,600 – $19,200 | $11,200 – $20,800 | $12,800 – $24,000 |
Prices reflect $6–12/sq ft for basic, $7–13 for driveway, $8–15 for garage-grade slabs. All estimates include material and labor. Use the calculator above for your exact dimensions.
Concrete Slab Costs by Project Type
Patio Slab Cost
A 16×12 ft concrete patio at 4" thick costs $1,150–$2,300. Broom finish is standard; stamped or colored finishes add $4–$12/sq ft.
Driveway Slab Cost
A standard two-car driveway (20×50 ft at 5" thick) runs $7,000–$13,000. Driveways require 5–6" thickness for vehicle weight, plus rebar reinforcement.
Garage Floor Cost
A 24×24 ft garage slab at 6" thick costs $3,450–$6,900. Heavier thickness + vapor barrier + rebar required.
Shed Foundation Cost
A 10×12 ft shed base at 4" costs $720–$1,440.
Basement Floor Cost
Concrete basement floors run $6–$11/sq ft, including excavation and drainage considerations.
What Goes Into a Concrete Slab Quote
Labor (40–50%)
Site prep, form setting, pouring, finishing, curing
Site Prep (12–16%)
Excavation, grading, compaction
Overhead & Margin (8–15%)
Permits, equipment, contractor profit
Use the calculator above to adjust these percentages for your specific project.
How to Use This Calculator
- Enter your slab dimensions — length, width, and thickness in feet and inches
- Enter your local price per cubic yard, plus optional labor and delivery totals
- Get your instant estimate — volume plus material, labor, delivery, and total
Frequently Asked Questions
How much does a 20×20 concrete slab cost?
A 20×20 ft concrete slab (400 sq ft) costs $2,400–$4,800 at 4" thick, $2,800–$5,200 at 5" thick. The wide range reflects regional labor differences and finish type. Use the calculator above for an estimate based on your local price per cubic yard.
What's the average cost of a concrete slab per square foot?
As of 2026, concrete slabs cost $6–$12 per square foot installed for most residential projects. Basic broom-finish patios land at the low end ($6–$8/sq ft); driveways with rebar run $7–$13/sq ft; garage floors at 6" thick cost $8–$15/sq ft. Stamped or decorative finishes add $4–$12/sq ft on top.
What factors affect concrete slab cost the most?
Four factors drive slab cost: (1) thickness — 4" vs 6" adds ~50% to material volume; (2) reinforcement — rebar vs wire mesh vs none; (3) site access — difficult terrain or long pump distance adds labor; (4) finish type — broom, stamped, polished, or exposed aggregate each carry different labor rates.
Is a concrete slab cheaper than pavers?
For most projects, concrete slabs ($6–$12/sq ft installed) are 30–50% cheaper than pavers ($10–$25/sq ft installed). Pavers require more labor for base prep and individual placement, though they offer easier repairs. For large areas (400+ sq ft), the concrete savings become significant.
How much does it cost to pour a concrete slab yourself?
DIY concrete slab cost runs $3–$5/sq ft for materials only (concrete, rebar, gravel, forms). A 20×20 slab at 4" requires ~4.94 cubic yards — roughly $620–$865 in concrete plus $200–$400 in other materials. Note: finishing concrete is unforgiving; mistakes are permanent and expensive to fix.
Does concrete slab cost vary by region?
Yes. Concrete slab costs vary significantly by US region: Northeast ($9–$14/sq ft), West Coast ($8–$13/sq ft), Midwest ($6–$11/sq ft), and Southeast ($6–$10/sq ft). Labor rates and concrete material costs drive most regional differences. Enter your local price per cubic yard in the calculator above for a localized estimate.
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Footing CalculatorStrip footings, pier footings, deck footings
Pad Cost CalculatorSquare, rectangular, or round pad budgets