Concrete yardage calculator
Short answer
To find concrete yardage, multiply length × width × thickness in feet, then divide by 27. A 10 × 10 ft slab at 4" is about 1.23 cubic yards. Pick a size below or use the calculator.
Yardage by slab size
| Slab (4" thick) | Cubic yards | Cubic feet |
|---|---|---|
| 8 × 8 ft | 0.79 | 21 |
| 10 × 10 ft | 1.23 | 33 |
| 10 × 12 ft | 1.48 | 40 |
| 12 × 12 ft | 1.78 | 48 |
| 12 × 16 ft | 2.37 | 64 |
| 12 × 20 ft | 2.96 | 80 |
| 16 × 20 ft | 3.95 | 107 |
| 20 × 20 ft | 4.94 | 133 |
| 20 × 24 ft | 5.93 | 160 |
| 24 × 24 ft | 7.11 | 192 |
| 24 × 30 ft | 8.89 | 240 |
| 30 × 40 ft | 14.81 | 400 |
| 40 × 60 ft | 29.63 | 800 |
Your exact size
Open the concrete calculatorFrequently asked questions
How do I calculate concrete yardage?
Multiply length × width × thickness (all in feet) to get cubic feet, then divide by 27 for cubic yards. Add about 10% for waste before ordering.
How many cubic feet are in a yard of concrete?
Exactly 27 cubic feet make one cubic yard. Ready-mix concrete is ordered and priced by the cubic yard.
How many yards of concrete for a 10x10 slab?
A 10 × 10 ft slab at 4" thick is about 1.23 cubic yards (33 cubic feet). The calculator handles slabs, footings, walls, and columns.