How deep should gravel be for a driveway?

A gravel driveway typically needs 4-6 inches of total depth, usually applied in layers: 4 inches of base gravel (crushed stone) topped with 2 inches of surface gravel. For foot-traffic paths, 2-3 inches is sufficient. For patios, 2-4 inches works well depending on the base preparation.

How much gravel do I need for a 10x20 driveway?

For a 10x20 ft driveway at 4 inches deep, you need about 2.5 cubic yards or roughly 3.5 tons of gravel. At $50/ton, that's approximately $175 for the gravel alone.

What's the difference between cubic yards and tons of gravel?

Cubic yards measure volume while tons measure weight. The conversion depends on the gravel type: most gravel weighs about 1.35-1.5 tons per cubic yard. Pea gravel and crushed stone are about 1.4 tons/cubic yard, while decomposed granite is heavier at about 1.5 tons/cubic yard.

What type of gravel should I use?

Pea gravel is best for walkways and decorative areas. Crushed stone (angular) is ideal for driveways as it compacts well. River rock works for drainage and decorative beds. Decomposed granite is perfect for patios, paths, and xeriscaping. For driveways, use angular gravel that locks together.

Do I need a base layer under gravel?

Yes, for driveways and high-traffic areas, start with a compacted base of larger crushed stone (1-2 inches) about 4 inches deep. Then add your surface gravel on top. For garden paths and decorative areas, landscape fabric underneath prevents weeds and keeps gravel from sinking into soil.

How do I keep gravel from spreading?

Install edging or borders made of metal, plastic, stone, or wood along all edges. For driveways, use compactable angular gravel (not round pea gravel) that locks together. Adding a slight crown (higher center) to driveways helps gravel stay in place. Landscape fabric underneath prevents sinking.

Gravel Calculator

Calculate how much gravel you need in tons and cubic yards. Supports multiple gravel types with accurate density calculations. Free, no signup required.

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