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Convert area in square feet to volume in cubic feet by adding depth. Perfect for calculating material quantities for landscaping, concrete, and construction projects.
Cubic Feet = Square Feet x Depth (ft)
Most bulk materials are sold in cubic yards
| Material | Light Use | Standard | Heavy Use |
|---|---|---|---|
| Mulch | 2 inches | 3 inches | 4 inches |
| Gravel | 2 inches | 4 inches | 6 inches |
| Topsoil | 2 inches | 4 inches | 6+ inches |
| Concrete | 4 inches (walkway) | 4-6 inches (patio) | 6+ inches (driveway) |
| Sand (base) | 1 inch | 2 inches | 3 inches |
Multiply the area in square feet by the depth in feet. If your depth is in inches, divide by 12 first. For example: 100 sq ft x 4 inches = 100 x (4/12) = 33.33 cubic feet.
There are 27 cubic feet in 1 cubic yard (3 x 3 x 3 = 27). Divide cubic feet by 27 to get cubic yards.
For 2-inch coverage: 1 cubic yard covers 162 sq ft. For 3-inch coverage: 1 cubic yard covers 108 sq ft. For 4-inch coverage: 1 cubic yard covers 81 sq ft.
Yes, add 5-10% extra for settling, spreading loss, and uneven surfaces. For materials like gravel and mulch that compact, consider adding even more.
Bulk materials like mulch, gravel, topsoil, and concrete are sold by the cubic yard because it is a more practical unit for large quantities. Bagged materials may use cubic feet.
Sidewalks: 4 inches minimum. Patios: 4-6 inches. Driveways: 6 inches minimum, 8 inches for heavy vehicles. Always check local codes.