Gravel for 16 × 20 ft by depth
| Depth | Cu ft | Cu yd | Tons, gravel | Tons, crushed stone | 0.5 cu ft bags |
|---|---|---|---|---|---|
| 2 in | 53 | 1.98 | 2.80 | 2.96 | 107 |
| 3 in | 80 | 2.96 | 4.20 | 4.44 | 160 |
| 4 in | 107 | 3.95 | 5.60 | 5.93 | 214 |
| 6 in | 160 | 5.93 | 8.40 | 8.89 | 320 |
| 8 in | 213 | 7.90 | 11.2 | 11.9 | 427 |
| 12 in | 320 | 11.9 | 16.8 | 17.8 | 640 |
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. A 16x20 pad is a common size for a shed, hot tub or patio; see the project calculators for the depth each one calls for.
Working it out
320 sq ft × depth (in) ÷ 12 ÷ 27 = cubic yards
At 4 inches: 320 × 4 ÷ 12 = 106.7 cubic feet, ÷ 27 = 3.95 cubic yards. Multiply by the weight per cubic yard of your stone to get tons.
Common questions
How many yards of gravel for a 16x20 area at 3 inches?
2.96 cubic yards, about 4.20 tons.
How many bags of gravel for a 16x20 area?
At 2 inches deep, 107 bags of 0.5 cu ft; at 4 inches, 214.
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