About the Gravel Calculator
Enter the area and depth to get gravel volume in cubic yards and an approximate weight in tons. Handy for driveways, paths, and drainage — confirm the supplier's tons-per-yard for your specific stone.
How it’s calculated
Volume = area × (depth ÷ 12) ÷ 27 cubic yards; tons ≈ cubic yards × 1.4 for typical crushed gravel.
Example calculation
A 20 × 10 ft area at 3 inches deep needs about 1.85 cubic yards, roughly 2.6 tons.
Frequently asked questions
How deep for a driveway?
Driveways are usually built in compacted layers totaling 4–6 inches or more over a prepared base. Paths need less — 2–3 inches is often enough.
Why is the tonnage approximate?
Density varies by stone type, size, and moisture. Use the tons figure as a guide and confirm the exact conversion with your supplier.
This is a general material estimate for planning only. Actual quantities vary with waste, offcuts, site conditions, product coverage, and technique. Confirm measurements and coverage rates before ordering, follow local building codes, and round up — running short mid-project is costly.