Free Gravel Calculator
Calculate how much gravel you need for any project. Enter dimensions to get cubic yards, tons, and estimated cost for driveways and more.
Gravel Needed
2.47 cubic yards
Weight (tons)
3.46 tons
Cubic Feet
66.7 ft³
Estimated Cost
$104 – $207
Formula
Cubic Yards = (Length × Width × Depth in feet) ÷ 27 | Tons = Cubic Yards × 1.4How to Calculate Gravel for Your Project
Whether you're building a driveway, creating a drainage solution, or landscaping a garden path, knowing exactly how much gravel to order saves money and prevents delays. This calculator converts your project dimensions into cubic yards and tons — the two measurements suppliers use for pricing and delivery.
The formula is straightforward: multiply length by width by depth (all in feet) to get cubic feet, then divide by 27 to convert to cubic yards. Since gravel is sold by weight, we multiply by 1.4 to estimate tons, which is the average weight of most gravel types per cubic yard.
Choosing the Right Gravel Type
Not all gravel is created equal. Crushed stone (#57 stone) is the most popular for driveways because its angular edges interlock for a stable surface. Pea gravel is smooth and rounded, making it comfortable for walkways but prone to shifting under vehicle weight. Crusher run (also called process gravel) contains a mix of stone dust and crushed rock that compacts into an extremely solid base.
For driveways, many contractors recommend a three-layer approach: a 4-inch base of #3 stone (larger rocks), a 4-inch middle layer of #57 stone, and a 2-inch top layer of crusher run or fine gravel for a smooth finish.
Ordering and Delivery Tips
Always order 5-10% more gravel than your calculation shows. Ground isn't perfectly level, and some material is lost during spreading and compacting. Most suppliers have a minimum delivery of 1-2 tons, and delivery fees typically range from $50-$150 depending on distance from the quarry.
If your project requires less than a ton, consider picking up bags from a home improvement store — though this is significantly more expensive per ton than bulk delivery. A single cubic yard of gravel weighs about 2,800 pounds, so make sure your vehicle can handle the weight if you plan to haul it yourself.
Gravel Depth Guidelines by Project
Proper depth is critical for longevity. Driveways need 4-6 inches minimum to support vehicle weight without rutting. Walkways and garden paths work well at 2-3 inches. French drains require 8-12 inches of gravel surrounding the perforated pipe. Patio bases should have 4 inches of compacted gravel beneath pavers or flagstone. Under-estimating depth is the most common mistake — thin gravel layers shift, develop ruts, and allow weeds to push through much sooner.
Frequently Asked Questions
How many tons of gravel do I need for a driveway?
A typical single-car driveway (10×20 ft) with 4 inches of gravel needs about 1.4 cubic yards or roughly 2 tons. A two-car driveway (20×20 ft) needs about 2.8 cubic yards or 4 tons. Always order 5-10% extra for settling and spreading.
How deep should gravel be?
For driveways, use 4-6 inches of gravel. For walkways and paths, 2-3 inches is sufficient. For drainage projects, 6-12 inches is typical. French drains usually need 8-12 inches of gravel surrounding the drain pipe.
How much does gravel cost per ton?
Gravel costs $30-60 per ton depending on type and location. Pea gravel and crushed stone are on the lower end ($30-40/ton). Decorative gravel and river rock cost more ($50-80/ton). Delivery fees typically add $50-150 depending on distance.
What's the difference between cubic yards and tons?
Cubic yards measure volume while tons measure weight. For gravel, 1 cubic yard weighs approximately 1.4 tons (2,800 lbs). The exact weight varies by gravel type — pea gravel is lighter (~1.3 tons/yd³) while crushed limestone is heavier (~1.5 tons/yd³).
Should I use gravel or crushed stone?
Crushed stone (angular edges) locks together and is ideal for driveways and base layers. Pea gravel (rounded) is better for walkways and decorative areas. For best driveway results, use a crushed stone base layer topped with a finer crushed stone surface layer.