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| Depth | Cu yd | Tons (≈1.4 t/yd³) |
|---|---|---|
| 2″ | 2.96 | 4.15 |
| 3″ | 4.44 | 6.22 |
| 4″ | 5.93 | 8.30 |
| 6″ | 8.89 | 12.44 |
| 8″ | 11.85 | 16.59 |
Worked example
12 × 40 = 480 sq ft; × 4 in ÷ 12 = 160.0 cu ft; ÷ 27 = 5.93 yd³ ≈ 8.30 tons. Density varies by stone type and moisture, so confirm with your supplier.
Frequently asked questions
How many tons of gravel for 12×40?
About 8.30 tons at 4 inches.