Concrete Slab Cost Calculator
Use this concrete slab cost calculator to estimate material volume and total project cost based on slab dimensions and thickness. Designed for driveways, patios, garage floors, and foundations using standard US measurements to help homeowners and contractors plan accurate budgets before pouring concrete.
× (Material + Labor + Finish) Cost per sq ft
Standard finish $4–$8/sq ft · Exposed aggregate $6–$10/sq ft · Stamped $8–$18/sq ft · Colored $5–$10/sq ft (installed) · Includes concrete + labor
Estimates based on 2026 US average pricing. Actual costs vary by region. Always get 3 quotes before starting.
How Does the Concrete Slab Cost Calculator Work?
This concrete slab cost calculator estimates the total cost of pouring a concrete slab based on dimensions, thickness, finish type, and labor. It also calculates how many cubic yards of concrete you'll need. Uses 2026 US average pricing.
Steps:
- Enter your slab length and width in feet.
- Select your slab thickness — 4 inches for patios and walkways, 6 inches for driveways and garage floors.
- Select your concrete finish — standard broom, exposed aggregate, stamped, or colored.
- Choose DIY or Contractor for labor.
- Get instant results — total cost, cost per sq ft, slab area, cubic yards needed, material cost, and labor cost.
Always add 10% extra when ordering concrete for waste and overrun. A short load fee from ready-mix companies applies if you order less than a minimum (usually 1 cubic yard) — always confirm minimums with your supplier.
Concrete Slab Cost by Type (2026)
Here's a full breakdown of 2026 US average installed costs per square foot for all 4 concrete finishes, plus a typical 400 sq ft slab total at each thickness.
| Finish Type | Installed $/sq ft (4") | Installed $/sq ft (6") | 400 sq ft Total (6") | Best For |
|---|---|---|---|---|
| Standard Broom | $4 – $8 | $5 – $10 | $2,000 – $4,000 | Driveways, garage floors |
| Colored Concrete | $5 – $10 | $6 – $12 | $2,400 – $4,800 | Patios, decorative slabs |
| Exposed Aggregate | $6 – $10 | $7 – $12 | $2,800 – $4,800 | Pool decks, patios |
| Stamped Concrete | $8 – $18 | $10 – $20 | $4,000 – $8,000 | Decorative patios, entries |
*Installed cost includes concrete material, labor, forming, finishing, and curing. Rebar is additional — use our Rebar Calculator to estimate.
Standard broom finish is the most affordable and most durable for functional slabs like driveways and garage floors. Stamped concrete is beautiful but costs 2–3× more and requires resealing every 2–3 years to maintain appearance.
Example Calculation
You want to pour a standard broom finish concrete slab, 20 ft × 20 ft, 6 inches thick, hired contractor.
20 ft × 20 ft = 400 sq ft
Step 2 — Calculate cubic yards:400 × (6÷12) ÷ 27 = 400 × 0.5 ÷ 27 = 7.4 cubic yards (order 8.2 with 10% waste)
Step 3 — Material cost ($2–$4/sq ft):400 × $2 = $800 | 400 × $4 = $1,600
Material: $800 – $1,600
400 × $3 = $1,200 | 400 × $6 = $2,400
Labor: $1,200 – $2,400
$2,000 – $4,000 ($5 – $10 per sq ft)
Factors That Affect Concrete Slab Cost
Site Preparation
Excavation, grading, and base preparation add $1–$3 per sq ft. Rocky soil or sloped sites can significantly increase prep costs. A properly prepared 4–6 inch compacted gravel base is essential for slab longevity.
Rebar & Wire Mesh
Rebar reinforcement adds $0.35–$0.60 per sq ft for materials. Wire mesh adds $0.10–$0.30 per sq ft. Both improve crack resistance — rebar is recommended for driveways and structural slabs.
Concrete Mix & PSI
Standard residential concrete is 3,000–4,000 PSI. Higher PSI mixes for heavy loads or freeze-thaw climates cost 10–20% more. Fiber-reinforced concrete adds $2–$5 per cubic yard.
Removal of Existing Concrete
Breaking up and hauling away existing concrete adds $2–$6 per sq ft. A 400 sq ft slab costs $800–$2,400 extra to remove before new concrete is poured.
Permits
Most municipalities require permits for concrete slabs over 200 sq ft or attached to a structure. Permits typically cost $100–$300. Always check local codes — especially for driveways connecting to a public road.
Concrete contractor pricing varies widely. Get 3 itemized quotes. Ask each to break out site prep, formwork, concrete material, finishing, rebar, and any removal fees separately.