A 12×12 patio covers 144 square feet. Multiply area by the planned pea-gravel depth and divide by 324 to convert square feet and inches into cubic yards.
Quantity by depth
| Depth | Theoretical volume |
|---|---|
| 1 inch | 0.44 cubic yard |
| 2 inches | 0.89 cubic yard |
| 3 inches | 1.33 cubic yards |
| 4 inches | 1.78 cubic yards |
Choose depth for the complete design
Rounded pea gravel can shift when placed too deeply and should not be confused with compactable angular base aggregate. The appropriate section depends on subgrade, drainage, edging and intended furniture use.
Add a modest allowance
At two inches, a 10% allowance changes 0.89 yard to about 0.98 yard. Confirm supplier minimums and weight conversion before ordering.
For broader planning, see landscaping cost factors.
Calculate pea gravel for any patio size →
Verify the project specification
Local conditions, product requirements and project rules can change the final quantity or installation method. For additional background, consult Concrete Masonry & Hardscapes Association resources, along with the selected manufacturer and local authority.
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