Aggregate
Calculator

To calculate aggregate, measure the length and width of your project area in feet, then decide on the depth in inches. Multiply length × width to get the area in square feet, then multiply by the depth in inches divided by 12 to get cubic feet. Divide cubic feet by 27 to convert to cubic yards. For tons, multiply cubic yards by the material density (typically 1.35–1.5 tons per cubic yard). Our aggregates calculator handles all of this automatically.

For a typical residential driveway (20 ft × 40 ft × 4 inches deep), you need roughly 9.9 cubic yards or about 13.8 tons of crushed stone. Driveways generally require 4–6 inches of aggregate depth depending on soil conditions and traffic. Use the aggregate calculator tons feature above to get an exact estimate for your driveway dimensions.

Crushed stone has angular, jagged edges that lock together, making it ideal for driveways, foundations, and base layers. It compacts well and provides excellent stability. Pea gravel consists of small, smooth, rounded stones that are comfortable to walk on and visually appealing for walkways, patios, and garden paths. Pea gravel does not compact as firmly and tends to shift underfoot, so it is not recommended for high-traffic driveways.

Depth depends on the project: driveways typically need 4–6 inches, walkways 2–3 inches, patios 3–4 inches, and decorative landscaping 2–3 inches. For areas with heavy vehicle traffic, go with 6 inches or more. Always compact the sub-base before adding the top layer. Use our aggregate calculator yards feature to see how depth affects volume and cost.

The weight varies by material type. Crushed stone and pea gravel weigh approximately 1.4 tons (2,800 lbs) per cubic yard. River rock is heavier at about 1.5 tons (3,000 lbs) per cubic yard. Decomposed granite and sand weigh roughly 1.35 tons (2,700 lbs) per cubic yard. These are approximate figures — actual weight depends on moisture content and particle size.

Yes, in most cases a compacted base layer is recommended. For driveways, use 4–6 inches of compacted crushed stone base before the top layer. For walkways and patios, 2–4 inches of base material is typical. A proper base layer improves drainage, prevents sinking, and extends the life of your project. Some projects also benefit from landscape fabric between the base and top layer to prevent weed growth.