Concrete Volume Calculator & Converter

4-Inch Thick Slab

Coverage per cubic yard: 81 sq ft
Coverage per cubic meter: 24.4 sq m
Formula: Area (sq ft) × 0.33 ft / 27 = cubic yards

6-Inch Thick Slab

Coverage per cubic yard: 54 sq ft
Coverage per cubic meter: 16.3 sq m
Formula: Area (sq ft) × 0.5 ft / 27 = cubic yards

Driveway Slab (5-inch)

Coverage per cubic yard: 65 sq ft
Typical 2-car driveway (20×24 ft): 1.85 cubic yards
Order 2-2.5 yards with waste factor

Example 1: Garage Slab

Dimensions: 24 ft × 24 ft × 6 inches
Volume: 24 × 24 × 0.5 = 288 cubic feet
Cubic yards: 288 / 27 = 10.67
Order: 11 cubic yards (add 5% waste)

Example 2: Concrete Columns

4 columns, 12 inch diameter, 10 ft height
Radius: 0.5 ft
Volume per column: π × 0.5² × 10 = 7.85 cu ft
Total: 4 × 7.85 = 31.4 cu ft = 1.16 cubic yards

Example 3: Footings

Perimeter footing: 120 ft × 2 ft × 1 ft
Volume: 120 × 2 × 1 = 240 cubic feet
Cubic yards: 240 / 27 = 8.89
Order: 9.5 cubic yards with waste

Example 4: Metric Slab

Slab: 5 m × 4 m × 150 mm
Volume: 5 × 4 × 0.15 = 3 cubic meters
Ready-mix bags: 3 / 0.02 = 150 bags (20kg each)
Or order 3 m³ ready-mix concrete