Concrete Calculator
Calculate the volume and weight of concrete necessary to cover a given area. Supports slabs, footings, post holes, walls, columns, curb & gutter, circular pours, and stairs. Purchasing slightly more concrete than the estimated result reduces the probability of having insufficient concrete.
Units:
Examples:
How to use this concrete calculator
- Choose a form (slab, footing, post holes, wall, stairs, etc.)
- Select imperial or metric units (or change per-field units)
- Enter your dimensions and quantity
- Set waste and density (optional but recommended)
- Add prices for a quick cost estimate (optional)
- Use “Copy link” to share, or “Print” to save a summary
Common volume presets
Volume = Length × Width × Thickness
| Preset | Dimensions | ~Cubic Yards |
|---|---|---|
| 10×10 slab 4in | 10 ft × 10 ft × 4 in | 1.23 yd³ |
| 20×20 patio 4in | 20 ft × 20 ft × 4 in | 4.94 yd³ |
| 20×10 patio 4in | 20 ft × 10 ft × 4 in | 2.47 yd³ |
| Fence posts (4) | 10 in dia × 36 in deep | 0.29 yd³ |