Rock Coverage Calculator
Calculate how much stone, gravel, or mulch you need for your project.
Project Results:
Total Area: 0 sq. ft.
Volume: 0 cubic yards
Weight: 0 tons
0.5 cu. ft. Bags: 0 bags
Estimated Cost: $0.00
*Estimates assume a standard rock density of 2,700 lbs per cubic yard. Consider adding 10% for settling and spills.
How to Use the Rock Coverage Calculator
Planning a landscaping project requires precision to ensure you don't overspend or run out of material halfway through the job. This calculator determines the volume and weight of landscape rock, gravel, or river stone needed based on your specific area dimensions.
The Rock Coverage Formula
To calculate rock coverage manually, use the following steps:
- Calculate Square Footage: Length (ft) × Width (ft) = Square Feet.
- Convert Depth to Feet: Depth (inches) / 12 = Depth in Feet.
- Calculate Cubic Feet: Square Feet × Depth in Feet = Cubic Feet.
- Convert to Cubic Yards: Cubic Feet / 27 = Cubic Yards.
- Calculate Tonnage: Cubic Yards × 1.35 = Tons (Approximate weight for most crushed stone).
Common Depth Recommendations
| Rock Size | Recommended Depth |
|---|---|
| Fine Gravel (1/4″ to 1/2″) | 2 Inches |
| Standard Crushed Stone (3/4″) | 3 Inches |
| Large River Rock (2″ to 4″) | 4-6 Inches |
Example Calculation
Suppose you have a garden bed that is 20 feet long and 5 feet wide. You want to fill it with 3/4″ crushed stone at a depth of 3 inches.
- Area: 20 * 5 = 100 sq. ft.
- Depth: 3 / 12 = 0.25 ft.
- Volume: 100 * 0.25 = 25 cubic feet.
- Yards: 25 / 27 = 0.93 cubic yards.
- Weight: 0.93 * 1.35 = 1.26 tons.