Calculate the amount of concrete needed for your construction projects. Estimate bags or cubic yards of concrete required.
A concrete calculator helps you estimate the amount of concrete needed for your construction projects. It takes into account the dimensions of your project, waste factor, and measurement preferences to provide accurate estimates.
For a 10ft × 10ft slab with 4-inch thickness:
Volume = (10 × 10 × (4/12)) / 27 = 1.23 cubic yards
With 10% waste factor: 1.35 cubic yards
73 bags of 60lb concrete required
Several factors affect concrete calculations:
• Always add a waste factor (typically 5-15%) to account for spillage and irregularities
• Consider the project type when calculating - different shapes require different formulas
• Remember that concrete is typically sold by cubic yards or in pre-mixed bags
• Account for sub-base preparation and formwork in your overall project planning
• Consider weather conditions - extreme temperatures can affect concrete setting time
Understanding these factors can help you accurately estimate your concrete needs and avoid costly overruns or delays.
Volume calculations by shape:
All measurements must be in consistent units. For cubic yards, divide cubic feet by 27.
| Thickness | Coverage per Cubic Yard |
|---|---|
| 2 inches | 162 sq ft |
| 3 inches | 108 sq ft |
| 4 inches | 81 sq ft |
| 6 inches | 54 sq ft |
• 40lb bag: 0.3 cubic feet
• 60lb bag: 0.45 cubic feet
• 80lb bag: 0.6 cubic feet
• 1 cubic yard = 27 cubic feet