Gravel Calculator

For a typical single-car driveway (10×20 ft or 3×6 m) at 4 inches (100mm) depth, you need approximately 2.5 tons (2.3 tonnes). A two-car driveway (20×20 ft or 6×6 m) requires about 5 tons (4.5 tonnes). Driveways should have 4-6 inches total depth, typically in layers: 4 inches of #3 crushed stone base topped with 2 inches of finishing gravel. Always order 10-15% extra for compaction and spreading variations.

One ton (2,000 lb or 907 kg) of gravel covers approximately: 80-100 sq ft (7.4-9.3 m²) at 2 inches deep, 50-60 sq ft (4.6-5.6 m²) at 3-4 inches deep. Coverage varies by gravel type—denser materials cover less area per ton. One cubic yard of gravel weighs 1.3-1.5 tons (1.18-1.36 tonnes) depending on type and moisture. Use this calculator to get precise estimates for your specific dimensions and gravel choice.

Cubic yards (yd³) and cubic meters (m³) measure volume, while tons and tonnes measure weight. The conversion depends on material density. One cubic yard of gravel typically weighs 1.3-1.5 US tons (1.18-1.36 tonnes). Wet gravel weighs more than dry gravel. Suppliers usually sell by weight (tons) because it's more consistent than volume, which varies with compaction and moisture levels. Always confirm pricing units with your supplier before ordering.

For driveways, use a three-layer system: bottom layer of #3 crushed stone (38-50mm) for drainage and stability, middle layer of #57 stone (25mm) for structure, and top layer of crusher run or #411 (stone dust mixed with small gravel) that compacts firmly. Avoid pea gravel for driveways—round stones shift under tires. Angular crushed stone locks together creating a stable, durable surface. This system works worldwide regardless of local material names.

For foot-traffic areas like patios and walkways, 2-3 inches (50-75mm) of gravel is sufficient. Use landscape fabric underneath to prevent weed growth and mixing with soil. For decorative gravel over fabric, even 1-2 inches works. If the area will support furniture or occasional light vehicles, increase to 4 inches (100mm). Always compact in 2-inch lifts for best stability. Edge restraints help contain loose gravel.

Gravel prices vary significantly by region: USA $30-80/ton depending on type and location; UK £25-60/tonne; EU €25-55/tonne; Australia A$50-100/tonne; India ₹800-2000/tonne. Delivery adds $50-150 per load in most regions. Prices increase with distance from quarries. Decorative gravels (river rock, colored stone) cost 2-3× more than basic crushed stone. Get multiple quotes from local suppliers and ask about bulk discounts for larger orders.

Yes, compaction is essential for driveways and any load-bearing surface. Compact gravel in 2-inch (50mm) lifts using a plate compactor or roller. Water lightly before compacting to help particles settle. Expect 10-15% volume reduction after compaction—order extra to compensate. For walkways and decorative areas, light tamping or natural settling is sufficient. Without proper compaction, driveways develop ruts, potholes, and uneven surfaces within months.

For irregular areas, divide into simple rectangles and triangles, calculate each section separately, then add them together. For curved areas, approximate with rectangles or use the formula for circles (πr² for circular areas). For kidney-shaped or complex curves, multiply the maximum length by maximum width and multiply by 0.8 as an approximation. Add 15-20% extra for irregular shapes versus the standard 10% waste factor for rectangular areas.