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Concrete Slab Calculator

Plan a concrete slab from start to finish — concrete volume (cubic yards, bags, truck loads), rebar or wire mesh, gravel base, vapor barrier, and a full cost breakdown with a downloadable PDF estimate.

Material quantities are geometric estimates and costs use 2024-2025 U.S. averages. Prices vary by region and contractor — always order a little extra and get 3+ quotes. For planning purposes only.

Slab Details
1 Slab Size
ft
×
ft
sq ft
4" = patios/sheds; 5-6" = driveways/garages; 6-8" = heavy/structural
×
2 Reinforcement & Base
in o.c.
Typical residential slabs: 16" - 18" on center, both directions
Wire mesh ≈ $0.35/sq ft | Rebar ≈ $0.75/linear ft | Recommended for all slabs
3 Mix & Cost
10%
Most pros add 5-10% for spillage, uneven base, and form bulge
Yields: 40 lb ≈ 0.30 ft³ | 60 lb ≈ 0.45 ft³ | 80 lb ≈ 0.60 ft³
$/ cu yd
2024-2025 typical: $125 - $180 per cu yd
$/ sq ft
Flatwork install/finishing: $2 - $5 per sq ft. Set 0 for materials only.
Slab Estimate
Concrete To Order
—
Enter your slab details to begin
Cubic Yards (w/ waste) —
80 lb Bags —
Reinforcement —
Full Cost Breakdown
Slab area—
Ready-mix concrete —
Labor / finishing —
TOTAL ESTIMATE—
Total cost / sq ft —
Gravel base —
Truck loads (9 cu yd) —
Cost Breakdown Chart
Estimated cost by category ($)
Thickness Comparison — Your Slab
ThicknessCubic Yards80 lb BagsTruck LoadsConcrete Cost

For your 400 sq ft slab (waste included). Concrete cost = ready-mix only, at your $/cu yd.