Gravel for 30 × 30 ft by depth
| Depth | Cu ft | Cu yd | Tons, gravel | Tons, crushed stone | 0.5 cu ft bags |
|---|---|---|---|---|---|
| 2 in | 150 | 5.56 | 7.88 | 8.33 | 300 |
| 3 in | 225 | 8.33 | 11.8 | 12.5 | 450 |
| 4 in | 300 | 11.1 | 15.8 | 16.7 | 600 |
| 6 in | 450 | 16.7 | 23.6 | 25.0 | 900 |
| 8 in | 600 | 22.2 | 31.5 | 33.3 | 1,200 |
| 12 in | 900 | 33.3 | 47.2 | 50.0 | 1,800 |
Gravel at 1.42 t/yd³ (Engineering ToolBox); crushed stone at 1.50 t/yd³ (Hello Gravel). No extra added.
Rochester Concrete Products' install guide adds 10% for compaction and uneven ground.
Working it out
900 sq ft × depth (in) ÷ 12 ÷ 27 = cubic yards
At 4 inches: 900 × 4 ÷ 12 = 300.0 cubic feet, ÷ 27 = 11.1 cubic yards. Multiply by the weight per cubic yard of your stone to get tons.
Common questions
How many yards of gravel for a 30x30 area at 3 inches?
8.33 cubic yards, about 11.8 tons.
How many bags of gravel for a 30x30 area?
At 2 inches deep, 300 bags of 0.5 cu ft; at 4 inches, 600.
Related calculators
Sources
- https://www.engineeringtoolbox.com/dirt-mud-densities-d_1727.html
- https://hellogravel.com/guides/2025-gravel-prices-per-ton-delivered-cost-calculator-and-regional-rates/
- https://www.doitbest.com/product/276837/
- https://rochestercp.com/resources/installation-manuals/installation-manual-vintage-6.pdf