Estimate cylindrical tubes (8", 10", 12" Sonotubes) or continuous trench footings for decks, pergolas, and retaining walls.
Professional results require proper jobsite tooling. Keep these essential items ready before starting your project:
Standard pre-calculated dimensions with built-in 10% safety margin.
| Slab Dimensions | Area (Sq Ft) | 4" Slab (Yds³) | 80 lb Bags (4") | 60 lb Bags (4") | 6" Slab (Yds³) | 80 lb Bags (6") | 60 lb Bags (6") |
|---|---|---|---|---|---|---|---|
| 10 ft × 10 ft (Small Patio) | 100 sq ft | 1.36 yd³ | 62 bags | 82 bags | 2.04 yd³ | 92 bags | 123 bags |
| 12 ft × 12 ft (Medium Patio) | 144 sq ft | 1.96 yd³ | 88 bags | 118 bags | 2.93 yd³ | 132 bags | 176 bags |
| 16 ft × 16 ft (Large Patio / Shed) | 256 sq ft | 3.48 yd³ | 157 bags | 209 bags | 5.22 yd³ | 235 bags | 314 bags |
| 20 ft × 20 ft (2-Car Garage Slab) | 400 sq ft | 5.43 yd³ | 245 bags | 326 bags | 8.15 yd³ | 367 bags | Truck Delivery |
Step-by-step contractor formula breakdown based on dimensional geometry and ASTM material densities.
Volume (Cubic Feet) = Length (ft) × Width (ft) × [Thickness (inches) / 12]
Cubic Yards = Volume (cu ft) / 27
Cubic Meters = Cubic Yards × 0.764555
Total Required = Raw Volume × (1 + [Waste Factor % / 100])
Trade-verified guidance for Concrete Footing & Pier Calculator.
Material Supply & Tool Deals (336x280 / Fluid)
Zero CLS Pre-Reserved Container