| Depth | Cu yd | Tons (≈1.4 t/yd³) |
|---|
| 2″ | 2.47 | 3.46 |
| 3″ | 3.70 | 5.19 |
| 4″ | 4.94 | 6.91 |
| 6″ | 7.41 | 10.37 |
| 8″ | 9.88 | 13.83 |
Worked example
20 × 20 = 400 sq ft; × 4 in ÷ 12 = 133.3 cu ft; ÷ 27 = 4.94 yd³ ≈ 6.91 tons. Density varies by stone type and moisture, so confirm with your supplier.
Frequently asked questions
How many tons of gravel for 20×20?
About 6.91 tons at 4 inches.