Concrete Slab Cost Calculator
Model an indoor or outdoor concrete slab from length, width, thickness, and finish — then scale by state. Click any i for detail.
Your slab
Length (ft)
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Length
Long side of the pour area in feet. |
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Width (ft)
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Width
Short side of the pour — patios and garage floors often run 12–24 ft. |
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Slab thickness
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Thickness
Four inches is typical for light loads; thicker slabs suit equipment or heavy storage. |
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Surface finish
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Finish
Broom adds traction outdoors. Smooth trowel suits interior floors under finish materials. |
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Your state
i
Your state
Scales midpoints for typical state-level labor and material costs versus the U.S. average. Not a local contractor bid. |
Options
How to use this calculator
- Enter length and width for the slab footprint.
- Pick thickness and surface finish.
- Choose your state for regional scaling.
- Toggle vapor barrier or mesh if your spec requires them.
Results explained
The total is an installed midpoint for ready-mix, pour, and finish. Optional lines appear when checkboxes are on.
Quick reference: concrete slab rates
U.S.-average installed midpoints per sq ft before state scaling.
| Spec | Per sq ft |
|---|---|
| 4 in broom | $6.95 |
| 5 in broom | $8.85 |
| 6 in broom | $11.15 |
| Smooth add-on | +$1.35 |
| Stamped add-on | +$4.95 |
Vapor barrier ≈ $0.72/sq ft; mesh upgrade ≈ $1.55/sq ft.
How the estimate is built
Base rate by thickness plus finish add-on, multiplied by area, plus optional upgrades, then state multiplier.
Example scenario
A 24×20 ft (480 sq ft) 4 in broom slab at U.S. average ≈ $3,336 before state scaling.
FAQ
Does this include excavation?
Only a workable subgrade is assumed. Major cut/fill or haul-off is a separate site line item.
Radiant heat tubes?
Not modeled. Hydronic prep often adds several dollars per sq ft — get a mechanical quote.
How long before I can load it?
Light foot traffic differs from parking a vehicle — follow your finisher’s cure schedule.