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Calculate the tons and cost of decorative rock for landscaping projects including river rock, pea gravel, cobblestone, and boulders.
| Rock Size | Coverage/Ton (2") | Best For |
|---|---|---|
| Pea Gravel (3/8") | 100 sq ft | Pathways, gardens |
| Small River Rock (3/4"-1") | 90 sq ft | Beds, drainage |
| Medium River Rock (1"-2") | 80 sq ft | Dry creek beds |
| Large Cobblestone (3"-6") | 60 sq ft | Borders, accents |
| Boulders (6"+) | 40 sq ft | Focal points |
Tons = Area ÷ (Coverage per Ton × (2 ÷ Depth))
Larger rocks have lower coverage because of the air space between them. Coverage decreases as rock size increases.
Decorative landscape rock typically costs $35-150 per ton depending on type and size. Pea gravel is cheapest, while large boulders are most expensive.
For decorative purposes, 2 inches is standard. Use 3-4 inches for pathways or areas with foot traffic. Ensure landscape fabric underneath.
Yes, always install quality landscape fabric to prevent weeds and keep rocks from sinking into soil. Overlap seams by 6 inches.