Gravel, crushed stone, and pea gravel are among the most versatile landscaping and construction materials available. Whether you're building a driveway, drainage trench, garden path, or decorative bed, getting your gravel quantity right prevents costly over-ordering and frustrating shortages. This…
Gravel, crushed stone, and pea gravel are among the most versatile landscaping and construction materials available. Whether you’re building a driveway, drainage trench, garden path, or decorative bed, getting your gravel quantity right prevents costly over-ordering and frustrating shortages. This guide shows you exactly how to calculate what you need.
The Basic Gravel Formula
Gravel volume is calculated the same way as any rectangular area: Length × Width × Depth = Volume. Convert your depth to feet (divide inches by 12), then divide by 27 to get cubic yards. Use our gravel calculator for instant results.
Example: A 20-foot × 10-foot driveway extension at 4 inches deep:
20 × 10 × (4/12) = 66.7 cubic feet ÷ 27 = 2.47 cubic yards
Recommended Gravel Depths by Application
- Decorative paths and beds: 2 inches
- Residential driveways: 4 inches (two-layer: 3″ base + 1″ surface)
- Heavy traffic driveways: 6 inches
- Drainage trenches: Fill to surface level
- Foundation drainage: 6–8 inches
Converting Cubic Yards to Tons
Gravel is sold by the cubic yard or by the ton at most suppliers. The weight depends on the type and moisture content, but a useful rule of thumb is 1.4 tons per cubic yard for typical crushed limestone or #57 stone. For pea gravel, use 1.35 tons per cubic yard.
Types of Gravel and Their Best Uses
- #57 Stone (3/4 inch crushed): Best all-around — driveways, drainage, concrete mix aggregate
- Pea Gravel (3/8 inch): Decorative paths, playgrounds, drainage layers, dog runs
- Crushed Limestone: Driveways — compacts well and hardens over time
- River Rock: Decorative landscaping and dry creek beds
- Recycled Concrete: Base layers and driveways — inexpensive but may have sharp edges
Installing Gravel the Right Way
For driveways and paths, excavate at least 2 inches deeper than your target depth. Lay landscaping fabric to suppress weeds before adding gravel. Compact the base layer before adding the surface layer. For paths, install edging (plastic, metal, or stone) to keep gravel contained — it will migrate over time without it.
Delivery vs. DIY Pickup
For orders over 2 cubic yards, delivery from a landscape supply company is usually the most practical option. A standard pickup truck can haul about 1–1.5 cubic yards safely. Bulk delivery prices per yard typically beat bagged gravel by 40–60% once you account for labor savings.
Conclusion
Calculating gravel quantities is straightforward with the right formula. Measure carefully, account for depth, add a 10% buffer for settling and waste, and decide whether bulk delivery or bags makes more sense for your project size. Getting the material estimate right at the start makes the actual installation much smoother.