How Much Does a Concrete Slab Cost Per Square Foot?
A typical 4-inch concrete slab costs $4 to $8 per square foot installed, as of March 2025. Prices vary by thickness, labor, and finish. Keep reading for a full breakdown and tips to save.
The short answer
A basic 4-inch concrete slab costs $4 to $8 per square foot installed, as of March 2025. For a typical 10x10 slab, that is $400 to $800 total. Actual cost depends on thickness, reinforcement, labor rates, and finish. Use our concrete slab calculator to get an exact estimate.
Key takeaways
- Size matters: larger slabs cost more overall but may have a lower per-square-foot cost.
- Labor is a big factor: about half the total cost goes to professional installation.
- Waste factor: always order 10% extra concrete to avoid running short.
- DIY savings: you can cut costs by doing site prep, but pouring and finishing require skill.
Pouring a concrete slab for a patio, shed, or driveway? Knowing the cost per square foot helps you budget accurately. Concrete is priced by the cubic yard, but most homeowners think in square footage. We break down the numbers in terms you can use. Here is everything you need to estimate your concrete slab cost, from materials to labor.
What Is the Average Cost per Square Foot for a Concrete Slab?
The cost varies based on slab thickness, reinforcement, and finish.
- A basic 4-inch slab for a patio costs $4 to $8 per square foot installed, as of March 2025.
- 6-inch slabs for driveways or heavy loads run $6 to $12 per square foot.
- Stamped or decorative finishes add $4 to $15 or more per square foot.
- Includes labor, materials, and a gravel base. Use our concrete slab calculator for a custom quote.
How Do I Calculate the Cost of a Concrete Slab Myself?
Estimating cost starts with measuring area and figuring cubic yards.
- Measure the length and width in feet, then multiply for square footage.
- Decide thickness: 4 inches = 0.33 feet (divide inches by 12).
- Calculate volume: multiply square footage by thickness in feet to get cubic feet.
- Convert to cubic yards: divide cubic feet by 27.
- Multiply by cost per yard: $120 to $180 per cubic yard delivered, as of March 2025.
- Add 10% waste for over-excavation and spillage.
- Don't forget the sub-base: 4 inches of compacted gravel. Use our gravel calculator to estimate.
What Factors Affect the Cost of a Concrete Slab?
Several factors influence the final price, from slab thickness to labor rates in your area.
- Material: concrete itself runs $120 to $180 per cubic yard, or about $2 to $3 per square foot for a 4-inch slab.
- Labor: professional installation adds $2 to $5 per square foot.
- Sub-base: a compacted gravel base costs $0.50 to $1.50 per square foot. Estimate gravel with our crushed stone calculator.
- Reinforcement: wire mesh or rebar adds $0.50 to $1 per square foot.
- Decorative finishes: stamping, staining, or coloring can add $4 to $15+ per square foot.
What Are the Most Common Mistakes When Estimating Concrete Slab Costs?
Underestimating waste and sub-base needs are frequent errors.
- Skipping the waste factor: always add 10% extra concrete to your order.
- Ignoring sub-base: a poor gravel base leads to cracks. Use our sand calculator if you need a leveling layer.
- Not compacting soil: soft ground causes settling.
- Forgetting delivery fees: short-load charges apply for small orders.
- Overlooking reinforcement: for load-bearing slabs, rebar or mesh is essential.
- Rushing the finish: proper troweling and curing take time and skill.
What Are the Different Options for Concrete Slab Installation?
You can choose between ready-mix delivery, bagged concrete, or specialty mixes.
- Ready-mix concrete: best for large slabs, delivered by truck, $4 to $8 per square foot installed.
- Bagged concrete: ideal for small DIY projects, $4 to $6 per 60-lb bag, covering about 2 to 3 square feet at 4 inches thick. See our bagged concrete calculator.
- High-strength concrete: for heavy loads, adds $10 to $20 per cubic yard.
- Fiber-reinforced concrete: can replace wire mesh in some cases, adding $5 to $10 per cubic yard.
Should I Pour a Concrete Slab Myself or Hire a Pro?
DIY can save on labor costs, but concrete work requires speed and skill.
- DIY is doable for small, non-structural slabs like a 10x10 shed pad if you have help and the right tools.
- Pros handle grading, finishing, and curing quickly, reducing the risk of cracks.
- Mistakes are costly: poor leveling or finishing can mean starting over.
- Consider your physical limits: concrete is heavy work.
- For driveways or structural slabs, a professional is strongly recommended.
- Get multiple quotes and check references. Before digging, figure out topsoil removal with our topsoil and fill dirt calculator.
| Cost per sq ft | $4-$8 | $6-$12 |
|---|---|---|
| Thickness | 4 inches | 6 inches |
| Best use | Patios, walkways, sheds | Driveways, heavy equipment |
| Durability | Good for normal loads | Extra strength for vehicles |
| Waste factor | 10% | 10-15% |
Questions this page answers
How much does a 10x10 concrete slab cost?
A 10x10 slab at 4 inches thick costs about $400 to $800 installed, as of March 2025. The price range reflects labor rates and finish options in your area. For a custom estimate, use our concrete slab calculator.
How many bags of concrete for a 10x10 slab?
A 10x10 slab 4 inches thick needs about 1.23 cubic yards of concrete, or roughly 74 60-pound bags. However, for this volume, ready-mix delivery is often cheaper than bagged mix.
How do I calculate concrete yards?
Multiply length times width times thickness in feet to get cubic feet, then divide by 27 to convert to cubic yards. Thickness in inches must be divided by 12 first. Our concrete slab calculator does the math for you.
Does concrete slab cost include labor?
Yes, the $4 to $8 per square foot range includes labor and materials. DIY projects where you do the work yourself will cost about $2 to $3 per square foot for materials only.
What is the cheapest way to pour a concrete slab?
For a small slab, doing site prep yourself and using bagged concrete is cheapest. For larger pours, ready-mix is more cost-effective per square foot despite the upfront delivery cost.
How thick should a concrete patio be?
A 4-inch thickness is standard for patios and walkways. For heavy loads like RVs or large trucks, go 5 to 6 inches with reinforcement.
Can I pour concrete over dirt?
No, you need a compacted gravel base first. Pouring directly on dirt leads to settling and cracking. A 4-inch gravel base is typical; use our gravel calculator to estimate how much you need.
How long does concrete take to cure?
You can walk on it after 24 hours, but avoid heavy loads for at least 7 days. Concrete reaches full strength after 28 days of curing.
A concrete slab costs $4 to $8 per square foot for a standard 4-inch installation, as of March 2025. The key numbers are thickness, area, and waste factor. For an accurate estimate tailored to your project, use our concrete slab calculator. It is fast, free, and helps you order the right amount.