Garage Slab Cost Calculator
Estimate what a concrete project costs, using installed price ranges from published cost guides.
Your result
Enter your numbers and press the button. Your result appears here.
A two-car garage is often 24 × 24 ft. Thicker 5 or 6 in slabs suit heavy vehicles.
How it works
Cost = area (ft²) × installed price per ft², plus removal and sealing if you add them. Cubic yards = area × thickness (in) ÷ 12 ÷ 27.
Example: garage floor slab at 576 ft² comes to about $2,304 to $4,608 and takes 7.11 yd³ of concrete at 4 in thick.
At a glance
Same settings as the calculator above, changing only the size.
| Size | Area | Low | High |
|---|---|---|---|
| 10×10 ft | 100 ft² | $400 | $800 |
| 12×12 ft | 144 ft² | $576 | $1,152 |
| 12×16 ft | 192 ft² | $768 | $1,536 |
| 16×20 ft | 320 ft² | $1,280 | $2,560 |
| 20×20 ft | 400 ft² | $1,600 | $3,200 |
| 24×24 ft | 576 ft² | $2,304 | $4,608 |
| 30×40 ft | 1,200 ft² | $4,800 | $9,600 |
Installed cost per square foot (US)
| Project | Per ft² |
|---|---|
| Concrete slab | $4 – $8 |
| Concrete patio | $6 – $9 |
| Concrete walkway or sidewalk | $6 – $9 |
| Concrete driveway | $6 – $12 |
| Slab foundation | $12 – $18 |
| Garage floor slab | $4 – $8 |
| Stamped concrete | $8 – $26 |
| Stamped concrete patio | $8 – $21 |
| Stamped concrete driveway | $8 – $28 |
| Stamped concrete walkway | $9 – $20 |
| Concrete removal | $3 – $8 |
| Concrete resurfacing | $3 – $5 |
| Concrete sealing | $1 – $3 |
| Stamped overlay on existing slab | $3 – $5 |
Ready-mix concrete: $120 to $170 per cubic yard delivered (HomeAdvisor).
Common questions
How much does a concrete slab cost per square foot?
HomeAdvisor puts a new slab at about $6 per square foot on average: $6 to $9 for patios and sidewalks, $6 to $12 for driveways and $12 to $18 for thick house foundations.
What makes concrete cost more?
Thickness, reinforcement, decorative finishes, difficult access, removing old concrete and small jobs with minimum charges all push the price up.
How much does stamped concrete cost?
HomeAdvisor puts stamped concrete at $8 to $26 per square foot depending on the pattern and colours.
Is it cheaper to buy bags or ready-mix?
Bags make sense for small jobs under about a cubic yard. For anything bigger, ready-mix delivered by truck is usually cheaper and much less work.
Sources
- Angi, Concrete slab cost: https://www.angi.com/articles/concrete-slab-cost.htm
- HomeAdvisor, Concrete slab cost: https://www.homeadvisor.com/cost/outdoor-living/concrete-slab/
- HomeAdvisor, Concrete driveway cost: https://www.homeadvisor.com/cost/garages/install-a-concrete-driveway/
- HomeAdvisor, Stamped concrete cost: https://www.homeadvisor.com/cost/patios-and-walkways/install-stamped-concrete/
- Angi, Stamped concrete patio cost: https://www.angi.com/articles/how-much-does-stamped-concrete-patio-cost.htm
- HomeGuide, Stamped concrete cost (removal and sealing): https://homeguide.com/costs/stamped-concrete-patio-cost