Cubic Yard Calculator

Understanding the Cubic Yard

A cubic yard is a volume measurement equal to a cube that measures 3 feet on each side, containing 27 cubic feet of material. It is the standard unit for ordering bulk construction materials including concrete, gravel, topsoil, sand, mulch, and fill dirt. Understanding cubic yard calculations saves money by preventing over-ordering or the costly mistake of running short mid-project.

The basic formula is straightforward: Length (feet) multiplied by Width (feet) multiplied by Depth (feet) divided by 27. The challenge for most homeowners is that depth is often specified in inches rather than feet. To handle this, divide the inch measurement by 12 before plugging it into the formula. A 4-inch depth becomes 0.333 feet, 6 inches becomes 0.5 feet, and 12 inches equals 1 foot.

Coverage Charts by Material

Different depths dramatically change how far a cubic yard of material goes. At 1 inch deep, one cubic yard covers 324 square feet. At 2 inches, 162 square feet. At 3 inches, 108 square feet. At 4 inches, 81 square feet. At 6 inches, 54 square feet. At 12 inches, 27 square feet. These figures apply to all materials equally because cubic yard is a volume measure. However, the practical depth varies by material: mulch is typically spread 2 to 4 inches deep, gravel driveways need 4 to 6 inches, and concrete slabs are 4 to 8 inches thick.

For landscape projects, one cubic yard of mulch covers a surprisingly large area. At the recommended 3-inch depth, a single yard covers 108 square feet. Most homeowners underestimate coverage and over-order. A 10-by-20-foot garden bed (200 square feet) needs only 1.85 cubic yards of mulch at 3 inches deep. For gravel, the same area at 4 inches deep needs 2.47 cubic yards, weighing approximately 3.5 tons. Knowing both the volume and weight helps you choose the right delivery vehicle.

Weight Calculations for Delivery

Material weight per cubic yard varies dramatically. Concrete is the heaviest common material at approximately 4,050 pounds (2 tons) per cubic yard. Gravel and crushed stone weigh 2,700 to 2,900 pounds per cubic yard. Sand ranges from 2,600 to 2,900 pounds depending on moisture content. Topsoil weighs 2,000 to 2,500 pounds per cubic yard depending on moisture and composition. Mulch is the lightest at 600 to 1,000 pounds per cubic yard depending on type and moisture.

These weight differences matter for delivery logistics. A standard pickup truck with a half-ton rating should only carry about one-third to one-half cubic yard of gravel or topsoil. Overloading risks damage to the truck suspension, tires, and brakes. A standard single-axle dump truck can legally carry 5 to 8 cubic yards of heavy material like gravel or 10 to 12 cubic yards of lighter materials like mulch. For large projects, a tandem-axle dump truck carries 10 to 14 cubic yards of gravel, making it the most cost-effective delivery option.

Common Project Estimates

Here are typical cubic yard requirements for common projects. A garden bed mulching (500 sq ft at 3 inches): 4.6 cubic yards. A gravel driveway (12x30 ft at 4 inches): 4.4 cubic yards. A concrete patio (12x16 ft at 4 inches): 2.4 cubic yards. A raised garden bed (4x8 ft, 12 inches deep): 1.2 cubic yards of soil mix. A French drain (50 linear ft, 12 inches wide, 18 inches deep): 2.8 cubic yards of drain gravel. A retaining wall backfill (20 ft long, 3 ft deep, 2 ft wide): 4.4 cubic yards of gravel. These estimates include a 10 percent waste factor. Actual requirements may vary based on site conditions, material settling, and measurement precision.

Ordering by Volume vs Weight

Bulk materials are sold by either cubic yards (volume) or tons (weight), and the pricing method varies by supplier and material type. Concrete is always ordered by the cubic yard. Gravel and crushed stone may be sold by either unit but is increasingly priced by the ton because weight is more precisely measured than volume. Topsoil, mulch, and compost are typically sold by the cubic yard. Sand can be either. Understanding the conversion between units is essential for comparing prices across suppliers.

To convert between cubic yards and tons, you need the material density. Divide the weight per cubic yard by 2,000 to get tons per cubic yard. For crushed gravel at 2,800 lbs/cu yd, one cubic yard equals 1.4 tons. If supplier A quotes gravel at $45 per cubic yard and supplier B quotes $35 per ton, the actual per-yard cost comparison is $45 versus $49 (1.4 tons times $35), making supplier A cheaper despite the higher per-unit price. Always convert to the same unit before comparing.

Delivery Logistics

Most bulk material suppliers charge a delivery fee of $50 to $150 per load, with the fee based on distance from their yard. Some suppliers include delivery in the material price for minimum orders (typically 5 to 10 cubic yards). Dump truck delivery requires adequate access: a path at least 10 feet wide, 25 feet long, with no overhead obstructions below 14 feet. The delivery area must support the truck weight of 25,000 to 50,000 pounds, meaning wet lawns and soft ground are problematic.

Timing your delivery is critical. Have materials delivered as close to the installation date as possible to minimize weathering, settling, and the need for double handling. For concrete, delivery timing is precise because the material must be placed within 60 to 90 minutes of batching. For gravel, topsoil, and mulch, same-day installation is ideal but next-day is acceptable. Avoid having bulk materials delivered before a rain forecast, as wet materials are heavier, harder to spread, and may run off into unwanted areas.

Saving Money on Bulk Orders

Several strategies can significantly reduce bulk material costs. First, combine orders with neighbors to reach volume discount thresholds and share delivery fees. Many suppliers offer 10 to 15 percent discounts for orders over 10 cubic yards. Second, pick up small quantities yourself if you have a truck or trailer. Most landscape supply yards charge $5 to $15 per bucket-load (about a third of a cubic yard) for self-loading. Third, consider recycled materials where appropriate. Recycled concrete aggregate costs 30 to 50 percent less than virgin crushed stone and works well for base layers. Recycled asphalt millings cost $10 to $25 per ton versus $30 to $50 for new material. Fourth, order during off-season months (late fall through early spring) when demand is lower and suppliers may offer better pricing.

Finally, compare at least three suppliers before ordering. Prices for the same material can vary by 30 percent or more between suppliers in the same market. Online material calculators on supplier websites often include markup, so calculate your own quantities and request quotes for specific amounts. Ask about return policies for unused material; some suppliers will pick up and credit full pallets or minimum quantities of unused material.