Enter your slab’s dimensions, thickness, reinforcement, and finish to estimate concrete slab cost per square foot — pro-installed or DIY. Includes old-concrete removal.
How to use this calculator
- Enter length and width in feet and pick a thickness (4 in patios, 6 in driveways).
- Choose reinforcement, finish, and whether old concrete needs removal.
- Compare DIY vs pro totals.
The math behind it
Pro: area × installed rate ($8/sq ft for 4 in, $10 for 6 in, $13 for 8 in), plus $4/sq ft stamped or $6 polished, plus $3/sq ft tear-out. DIY: cubic yards × ~$140 delivered, plus reinforcement ($0.60/sq ft mesh, $1.50 rebar) and finish materials. For material-only quantities use our concrete slab calculator.
FAQs
How much does a concrete slab cost?
A 20×20 ft 4-inch patio runs ~$3,200 pro-installed or ~$1,000 DIY in materials. Driveway-grade 6-inch slabs run $10+/sq ft pro.
How thick should my slab be?
4 inches for patios and walkways; 6 inches for driveways and garage floors; 8 inches for heavy loads.
Is DIY concrete worth it?
Materials are cheap (~$140/yd³) but concrete work is brutally time-sensitive — pros earn their margin on placing and finishing before it sets.