A gravel driveway that lasts is built in layers, and each layer has its own depth. The short answer: plan for 8–12 inches of total gravel on a new driveway, built as two or three compacted layers — not one thick pour.

Use caseRecommended depth
New driveway — total, all layers8–12 in
Base layer (large crushed stone, #3)4–6 in
Middle layer (2–3 in stone, #57)3–4 in
Top layer (smaller crushed stone)2–3 in
Refreshing an existing driveway1–2 in
Garden path or decorative cover2–3 in

Why the base layer matters most

The base layer does the structural work. Large angular crushed stone (often called #3 stone) locks together under compaction and spreads vehicle weight into the ground below. Skip it or skimp on it, and the driveway will rut and pump mud up through the surface in wet weather.

Each layer should be compacted before the next goes on. A plate compactor or several passes with a loaded vehicle will do; loose gravel at depth never firms up on its own.

Worked example

Say your driveway is 40 ft long and 12 ft wide, and you’re adding a 4-inch compacted base:

  • Volume: 40 ft × 12 ft × 0.33 ft ≈ 160 cubic feet, or about 5.9 cubic yards
  • Weight: at ~100 lb per cubic foot for crushed stone, that’s about 8 tons
  • With a 10% waste allowance, order around 8.8–9 tons

Repeat the same math for each layer with its own depth, and add the results. The Gravel Calculator does all of this for you — enter your dimensions once per layer and it returns cubic yards, tons, and a waste-adjusted order quantity.

Tips before you order

  • Gravel is usually cheaper per ton in larger deliveries — order all layers at once if you can stage the material.
  • Crown the driveway slightly (higher in the middle) so water sheds to the sides.
  • If your soil is soft or drainage is poor, lay geotextile fabric under the base layer; it keeps the stone from sinking into the subgrade.

Ready to get your numbers? Use the Gravel Calculator to estimate cubic yards, tons, and cost for each layer of your driveway.