Bulk Materials Guide
How Many Cubic Yards of Gravel Do I Need?
Master gravel volume calculations, ton conversions, and depth rules for driveways, walkways, and drainage bases.
Need instant calculations for your gravel project?
Enter your dimensions into our free Cubic Yard Calculator with density and ton conversion.
1. The Gravel Volume Formula
Gravel suppliers sell material by either the cubic yard or the ton. One cubic yard represents a 3-dimensional volume of 27 cubic feet.
Cubic Feet = Length (ft) × Width (ft) × (Depth in inches ÷ 12)Cubic Yards = Cubic Feet ÷ 27Gravel Tons = Cubic Yards × 1.4 tons/yd³ (approx. 2,800 lbs/yd³)2. How Deep Should Gravel Be?
| Project Type | Recommended Depth | Gravel Type |
|---|---|---|
| New Gravel Driveway Subbase | 4 to 6 inches | #2 or #3 Crushed Stone (1.5"–2.5") |
| Driveway Top Layer | 2 to 3 inches | #57 Stone (3/4" with fines) or Dense Grade Aggregate |
| Garden Walkway / Pathway | 2 to 3 inches | Pea Gravel (3/8") or Crushed Granite |
| French Drain / Foundation Drainage | Trench depth (8–12") | Washed #57 River Rock (clean, no dust) |