Concrete
Concrete Slab Calculator
Calculate concrete volume for rectangular slabs. Get cubic yards, bags, and cost.
Inputs
Live estimate
Material needed
6.79 cu yd
- Area
- 500 sq ft
- Cubic feet
- 166.67
- Cubic yards
- 6.17
- Estimated tons
- 13.58
- Estimated truckloads
- 0.68
- 80 lb bags
- 306
- Material cost
- $1,120
- Total cost
- $1,120
Diagram
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How it's calculated
Area is derived from your shape inputs and converted to sq ft.
Depth is converted to feet; cubic feet = area × depth.
Cubic yards = cubic feet ÷ 27, then × (1 + waste %) × (1 + compaction %).
Estimated tons = cubic yards (with waste) × 2.
Truckloads = cubic yards (with waste) ÷ truck capacity.
Total cost = cubic yards (with waste) × price per cubic yard + delivery.
Material assumptions
- Concrete density: 2.0 tons per cubic yard (~4,050 lb).
- Standard slab thickness: 4 inches; driveways: 5–6 inches.
- One 80 lb bag ≈ 0.022 cubic yards; ~45 bags per cubic yard.
Frequently asked questions
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These results are estimates only. Confirm quantities, compaction, waste, and delivery requirements with your supplier or project professional before ordering materials.