Understanding Crushed Stone Volume Calculation
Crushed stone, road base, and gravel are generally ordered by **Volume** in **Cubic Yards** (Cu. Yd.). The calculation determines the total volume of a rectangular area (Length x Width x Depth) and converts it to cubic yards.
Volume Calculation Principle
The core calculation is the standard volume formula for a rectangular prism: **1. Volume in Cubic Feet ($\mathbf{V_{ft^3}}$):** $$\text{Volume (ft}^3) = \text{Length (ft)} \times \text{Width (ft)} \times \frac{\text{Depth (in)}}{12}$$ **2. Volume in Cubic Yards ($\mathbf{V_{yd^3}}$):** $$\text{Volume (yd}^3) = \frac{\text{Volume (ft}^3)}{27}$$ The calculator includes a **10% factor** to account for compaction when installing the stone, especially for driveways or patio bases, ensuring the final desired depth is achieved.
[Image of a cross-section diagram showing layers of crushed stone and soil]Uses and Depth Recommendations
Landscaping and Walkways
- **Mulch/Decorative Top Layer:** **2-3 inches** is typically enough to suppress weeds and provide an attractive look.
- **Walkways/Patios (Light Use):** A compacted **4-inch** layer of gravel or crushed base provides adequate stability.
Structural Base Layers
- **Driveway Sub-Base:** A compacted layer of **6-8 inches** of crushed stone (like aggregate base course) is critical to support the asphalt or concrete layer above.
- **Drainage:** Coarser stone (like drain rock) used for drainage fields should be calculated based on the trench or perimeter dimensions.
Tip on Ordering:
Always confirm with your supplier the exact weight (tons) per cubic yard for the specific type of stone you are purchasing, as density varies. While the calculator provides cubic yards, some suppliers price by the ton.