Concrete Load Calculator
Calculate concrete volume in cubic yards, cubic meters, and bags. Determine materials needed for slabs, footings, columns, and other concrete structures.
Step 1: Project Dimensions
Concrete Volume Formula
Cubic Yards = (Length × Width × (Thickness/12)) ÷ 27
Concrete Bags = Cubic Yards × 45 (for 80lb bags)
Step 2: Project Type & Options
Common Concrete Thickness
Sidewalks: 4 inches
Patios: 4-6 inches
Driveways: 6 inches
Footings: 8-12 inches
Foundation Slabs: 8-10 inches
Concrete Volume Results
Total Concrete Volume Required
Concrete Project Comparison
| Project Type | Typical Thickness | Cubic Yards | 80lb Bags |
|---|
Concrete Volume Formulas
Cubic Yards = (Length × Width × (Thickness/12)) ÷ 27
Where:
• Length = Project length in feet
• Width = Project width in feet
• Thickness = Concrete thickness in inches
• 12 converts inches to feet
• 27 converts cubic feet to cubic yards
To convert:
• Cubic Meters = Cubic Yards × 0.764555
• Cubic Feet = Cubic Yards × 27
• Bags = Cubic Yards × 45 (for 80lb bags)
Example Calculation
Example: 20×10 ft Patio at 4″ Thickness
Length: 20 feet
Width: 10 feet
Thickness: 4 inches
Calculation:
(20 × 10 × (4/12)) ÷ 27 =
(200 × 0.333) ÷ 27 =
66.67 ÷ 27 =
2.47 cubic yards
Bags required:
2.47 × 45 = 111 bags (80lb each)
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