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Free Gravel Calculator

Instantly calculate how much gravel you need in cubic yards and tons. Get accurate estimates for driveways, landscaping, patios, and construction projects with cost breakdowns.

Understanding gravel coverage and quantities

Gravel is one of the most versatile materials used in landscaping, construction, and drainage projects. Whether you are building a new driveway, creating a garden path, or laying a foundation base, knowing how much gravel you need is essential to staying on budget and avoiding material shortages. Accurate gravel estimates depend on the shape and size of your area, your target depth, and the density of the gravel type you choose. Common gravel types include pea gravel, crushed stone, river rock, and decomposed granite, each with different densities and coverage rates.

Driveways and parking areas: Gravel driveways are cost-effective and provide excellent drainage. A typical residential driveway requires 4-6 inches of gravel depth for a stable, long-lasting surface.
Garden landscaping and pathways: Decorative gravel adds visual appeal and reduces weed growth. Pathways generally need 2-3 inches of gravel over landscape fabric for an attractive, low-maintenance surface.
Drainage and French drains: Gravel is essential for proper water management around foundations, in drainage trenches, and French drain systems to prevent flooding and water damage.
Base layers for pavers and concrete: A compacted gravel base of 4-8 inches provides a stable, level foundation for patios, walkways, retaining walls, and other hardscape structures.

How to calculate how much gravel you need

Calculating the right amount of gravel requires three key measurements: area, depth, and material density. Our free gravel calculator handles all the conversions automatically, but here is the step-by-step process so you understand exactly how gravel quantities are determined.

Measure your project area in feet (length x width for rectangles, or radius for circles)
Determine the gravel depth you need in inches (2-3 inches for paths, 4-6 inches for driveways)
Convert the depth to feet by dividing inches by 12
Calculate volume in cubic feet (area in sq ft x depth in ft), then divide by 27 to get cubic yards
Multiply cubic yards by the gravel density (typically 1.4 tons per cubic yard) to get weight in tons
Multiply volume or weight by your supplier's unit price to estimate total cost

Volume (cubic yards): (Length ft x Width ft x Depth ft) / 27

Weight (tons): Volume in cubic yards x Density (approx. 1.4 tons/yd3)

Cost estimate: Volume x Unit Price per cubic yard (or Weight x Price per ton)

Practical tips for ordering gravel

Always order 5-10% more gravel than your calculated amount to account for compaction, settling, spillage, and uneven terrain.
Install landscape fabric underneath decorative gravel to prevent weeds and keep stones from sinking into the soil over time.
Choose gravel depth based on your specific use case: 2-3 inches for walkways and decorative areas, 4-6 inches for driveways, and 6-8 inches for heavy-traffic or load-bearing areas.
Compact gravel in 2-inch layers using a plate compactor or hand tamper for maximum stability and a longer-lasting surface.
Confirm the exact density and coverage rate with your local gravel supplier before placing your final order, as density varies between gravel types and regions.

Frequently asked questions about gravel calculation

How much gravel do I need for a driveway?

For a standard single-car driveway (10 ft x 20 ft) with a recommended depth of 4 inches, you would need approximately 0.99 cubic yards or about 1.4 tons of gravel. A two-car driveway (20 ft x 20 ft) at the same depth requires roughly 1.98 cubic yards or 2.8 tons. For longer driveways, multiply the length by width in feet, multiply by depth in feet, and divide by 27 to get cubic yards. Always add 5-10% extra for compaction and waste.

How many tons of gravel do I need?

To calculate tons of gravel, first determine the volume you need in cubic yards, then multiply by the gravel density. Most gravel weighs between 1.3 and 1.5 tons per cubic yard, with 1.4 tons being a common average for crushed stone. For example, if you need 3 cubic yards of gravel, that equals approximately 4.2 tons. Pea gravel is slightly lighter at about 1.3 tons per cubic yard, while dense crushed limestone can reach 1.5 tons per cubic yard.

How deep should gravel be for a driveway?

A gravel driveway should be 4 to 6 inches deep for passenger vehicles. The base layer should be 4 inches of larger crushed stone (1 to 2.5 inches in size) for stability, topped with 2 inches of smaller gravel for a smoother driving surface. For driveways that support heavier vehicles like trucks or RVs, increase the total depth to 6-8 inches. Proper compaction between layers is critical to prevent ruts and ensure long-term durability.

How much does a cubic yard of gravel cost?

Gravel prices typically range from $15 to $75 per cubic yard depending on the type and your location. Plain crushed stone averages $30-$50 per cubic yard, while decorative gravel like pea gravel or river rock can cost $40-$75 per cubic yard. Delivery fees usually add $50-$150 depending on distance and quantity. Buying in bulk (5+ cubic yards) often reduces the per-yard cost significantly. Use our free calculator to estimate your total project cost including the amount you need.

How much gravel do I need per square foot?

The amount of gravel per square foot depends on the depth you need. At 2 inches deep, you need approximately 0.006 cubic yards (or about 17 pounds) per square foot. At 4 inches deep, that doubles to roughly 0.012 cubic yards (about 34 pounds) per square foot. For quick estimates, a single cubic yard of gravel covers about 162 square feet at 2 inches deep, 81 square feet at 4 inches deep, or 54 square feet at 6 inches deep.

How much does gravel weigh per cubic foot and cubic yard?

Gravel weight varies by type and moisture content. Dry gravel typically weighs 85 to 105 pounds per cubic foot, or roughly 2,300 to 2,800 pounds (1.15 to 1.4 tons) per cubic yard. Wet gravel is heavier, often adding 15-20% more weight due to water absorption. Pea gravel weighs about 96 lbs/ft3 (2,600 lbs/yd3), crushed stone averages 100 lbs/ft3 (2,700 lbs/yd3), and river rock is approximately 90 lbs/ft3 (2,430 lbs/yd3). Always verify the specific density with your supplier for the most accurate calculation.

Important: Calculator outputs are estimates only. Actual gravel quantities may vary based on material density, compaction rates, and site conditions. Always verify measurements and confirm pricing with your local gravel supplier before purchasing.