| Depth | Cu yd | Tons (≈1.4 t/yd³) |
|---|
| 2″ | 1.48 | 2.07 |
| 3″ | 2.22 | 3.11 |
| 4″ | 2.96 | 4.15 |
| 6″ | 4.44 | 6.22 |
| 8″ | 5.93 | 8.30 |
Worked example
12 × 20 = 240 sq ft; × 4 in ÷ 12 = 80.0 cu ft; ÷ 27 = 2.96 yd³ ≈ 4.15 tons. Density varies by stone type and moisture, so confirm with your supplier.
Frequently asked questions
How many tons of gravel for 12×20?
About 4.15 tons at 4 inches.