What Is a Cubic Yard?
A cubic yard is a unit of volume equal to 27 cubic feet (3 feet x 3 feet x 3 feet). It is the standard measurement used in the construction, landscaping, and material supply industries for ordering and delivering bulk materials such as concrete, gravel, sand, mulch, topsoil, and fill dirt. When contractors or suppliers refer to "a yard" of material, they mean one cubic yard. Understanding cubic yard calculations is essential for accurately estimating material quantities and avoiding costly over-ordering or project-delaying shortages.
This calculator converts your project dimensions from any unit (feet, inches, yards, or meters) into cubic yards, then provides material-specific weight estimates in tons, approximate costs, and the number of standard dump truck loads needed. Whether you are pouring a concrete patio, spreading gravel for a driveway, or mulching garden beds, accurate cubic yard calculations ensure you order the right amount of material the first time.
How to Calculate Cubic Yards
The basic formula for calculating cubic yards is: Cubic Yards = (Length x Width x Depth) / 27, where all measurements are in feet. If your measurements are in different units, convert them to feet first: divide inches by 12, multiply yards by 3, or multiply meters by 3.28084. The division by 27 converts cubic feet to cubic yards since there are 27 cubic feet in one cubic yard (3 x 3 x 3 = 27).
For example, to calculate the cubic yards needed for a driveway that is 30 feet long, 12 feet wide, and 4 inches deep: First convert 4 inches to feet (4/12 = 0.333 feet). Then: 30 x 12 x 0.333 = 119.88 cubic feet. Divide by 27: 119.88 / 27 = 4.44 cubic yards. It is standard practice to add 5-10% extra to account for compaction, spillage, and uneven surfaces, so you would order approximately 4.9 to 5 cubic yards.
Material Weight and Coverage Guide
Concrete weighs approximately 4,050 pounds (2.025 tons) per cubic yard. It is the heaviest common construction material and is ordered by the cubic yard from ready-mix companies. Concrete is used for foundations, slabs, patios, driveways, and sidewalks. A standard concrete delivery truck holds 8-10 cubic yards. At typical residential pricing of $125-$175 per cubic yard (delivered), concrete is a significant project cost.
Gravel weighs approximately 2,800 pounds (1.4 tons) per cubic yard. Common gravel types include pea gravel, crushed stone, and river rock. Gravel is used for driveways, drainage, landscaping beds, and road base. One cubic yard of gravel covers approximately 100 square feet at 3 inches deep. Gravel typically costs $30-$75 per cubic yard depending on the type and delivery distance.
Sand weighs approximately 2,700 pounds (1.35 tons) per cubic yard. Types include mason sand, fill sand, and play sand. Sand is used as a base layer under pavers, for sandboxes, in concrete mixing, and for drainage improvement. One cubic yard covers approximately 120 square feet at 2 inches deep. Sand costs $30-$60 per cubic yard delivered.
Mulch weighs approximately 400-800 pounds per cubic yard depending on moisture content and type. Wood chip mulch, bark mulch, and dyed mulch are the most common types. Mulch is applied 2-4 inches deep around plants and trees to retain moisture, suppress weeds, and regulate soil temperature. One cubic yard covers approximately 100-160 square feet at 2-3 inches deep. Mulch costs $25-$50 per cubic yard.
Topsoil weighs approximately 2,200 pounds (1.1 tons) per cubic yard. It is used for grading, lawn establishment, garden bed preparation, and filling raised beds. Quality topsoil should be screened to remove rocks and debris. One cubic yard covers approximately 100 square feet at 3 inches deep. Topsoil costs $25-$55 per cubic yard depending on quality and screening.
Fill dirt weighs approximately 2,000 pounds (1 ton) per cubic yard. It is the most economical bulk material, used for filling holes, raising grade levels, and backfilling foundations. Fill dirt is not suitable for growing plants because it lacks organic matter and nutrients. Costs range from $5-$30 per cubic yard, and it is sometimes available for free from construction sites with excess material.
Truck Load Capacities
A standard full-size dump truck holds approximately 10 cubic yards of material. Smaller single-axle trucks hold 5-8 cubic yards, while larger tri-axle trucks can carry 12-16 cubic yards. Pickup trucks with standard beds hold approximately 1 cubic yard (less for heavier materials due to weight limits). When estimating delivery costs, knowing the number of truck loads helps you compare pricing and schedule deliveries efficiently. Most suppliers offer better per-yard pricing for full truckloads versus partial loads.
Tips for Ordering Materials
Always add 5-10% extra to your calculated amount to account for compaction, spillage, uneven surfaces, and measurement imprecision. Running short mid-project is more expensive than having a small surplus. Measure carefully and in multiple spots if the area has uneven terrain, and use the average depth for your calculation. Consider compaction: loose materials like gravel and topsoil compact by 10-15% when settled, so factor this into your depth calculations if the finished depth matters.
Compare pricing by the ton versus by the yard. Some suppliers sell by weight (tons) and others by volume (cubic yards). Knowing the approximate weight per cubic yard of your material lets you compare prices accurately. Check delivery fees separately as they can significantly affect total cost, especially for small orders. Some suppliers offer free delivery above a minimum order quantity, making it worthwhile to order slightly more than you need.