20 by 20 patio slab
Common residential slab size.
$2,188–$4,232Typical installed rangeconcrete slab cost per square foot
Concrete Slab Cost Calculator
Concrete slab cost depends on thickness, finishing, site prep, reinforcement, and local labor; this tool separates material and labor assumptions.
Inputs
Results
Immediate estimateTypical installed range$2,188–$4,232$2,996 typical
Area400 sq ft
Concrete5.43 cu yd
Material range$788–$1,032
Labor range$1,400–$3,200
Cost breakdown
Materials$788–$1,032
Labor$1,400–$3,200
Total$2,188–$4,232$2,996 typical
Diagram
Slab quantity
A rectangular slab uses area and thickness to estimate cubic yards and cost range.
- Length
- Width
- Thickness
How this calculator works
Use length, width, thickness, waste, and region to estimate concrete yards and a national installed cost range.
Formula
Area is converted to cubic yards from thickness, adjusted for waste, then priced with material and labor ranges.
Cost scope
The default range is a planning estimate and excludes unusual access, demolition, permits, reinforcement, drainage, or decorative finishes.
Area
length × widthConcrete
area × thickness ÷ 27, plus wasteInstalled cost
materials range + labor rangeAssumptions
- Concrete delivery: National default concrete range with regional multiplier
- Labor: Basic forming, placement, and finishing range; site prep and reinforcement vary
Worked examples
Thin walkway
Shows the thin-slab caution.
$561–$1,121Typical installed rangeFAQ
Does this include rebar or wire mesh?
No. Add reinforcement separately based on project requirements.
Why use regional multipliers?
They provide a coarse U.S. MVP adjustment without pretending to know ZIP-code-level pricing.
Sources and review
- Concrete Prices and Cost Factors, The Concrete Network. Accessed 2026-07-16.
Reviewed 2026-07-16. Planning estimates only; confirm project-specific requirements.