Cubic yards & coverage per area by thickness
Typical industry planning values — NOT a structural/geotechnical design. A licensed engineer sizes load-bearing concrete, footings and reinforcement; confirm against your product’s spec sheet and local code.
Concrete is ordered by the cubic yard (1 yd³ = 27 ft³), and the area a yard covers depends entirely on thickness. The figures below are stable geometry — they never drift. Use them with the concrete calculator and the concrete slab calculator.
| Slab thickness | Area covered by 1 yd³ | Yards for 100 sq ft |
|---|---|---|
| 3 inches | 65.0 sq ft | 1.54 yd³ |
| 4 inches | 46.7 sq ft | 2.14 yd³ |
| 6 inches | 35.0 sq ft | 2.86 yd³ |
Stable geometry: 1 cubic yard = 27 cubic feet. Coverage per yard = 27 ÷ (thickness in feet). Order a little extra (5–10%) for spillage and uneven subgrade.