Gravel for 100 sq ft by depth
| Depth | Cu ft | Cu yd | Tons, gravel | Tons, crushed stone | 0.5 cu ft bags |
|---|---|---|---|---|---|
| 2 in | 17 | 0.62 | 0.88 | 0.93 | 34 |
| 3 in | 25 | 0.93 | 1.31 | 1.39 | 50 |
| 4 in | 33 | 1.23 | 1.75 | 1.85 | 67 |
| 6 in | 50 | 1.85 | 2.62 | 2.78 | 100 |
| 8 in | 67 | 2.47 | 3.50 | 3.70 | 134 |
| 12 in | 100 | 3.70 | 5.25 | 5.56 | 200 |
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
100 sq ft × depth (in) ÷ 12 ÷ 27 = cubic yards
At 4 inches: 100 × 4 ÷ 12 = 33.3 cubic feet, ÷ 27 = 1.23 cubic yards. Multiply by the weight per cubic yard of your stone to get tons.
Common questions
How many yards of gravel for 100 sq ft at 3 inches?
0.93 cubic yards, about 1.31 tons.
How many bags of gravel for 100 sq ft?
At 2 inches deep, 34 bags of 0.5 cu ft; at 4 inches, 67.
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