How much topsoil do you need?

It depends on depth. For topdressing at 0.25 inches: about 0.77 cubic yards. For a new lawn at 4 inches: about 12.3 cubic yards. For a 6-inch fill depth: about 18.5 cubic yards. Enter your dimensions and intended depth in the calculator above to get the exact figure for your project.

A standard dump truck carries 10 to 14 cubic yards of topsoil per load. Some smaller trucks carry 6 to 8 cubic yards. A tri-axle truck can handle up to 16 cubic yards, but weight limits are the real constraint — topsoil weighs 2,000 to 3,000 pounds per cubic yard, so a 14-yard load runs 14 to 21 tons. Always confirm load limits with your supplier before ordering.

One cubic yard equals 27 cubic feet. A standard 40 lb bag of topsoil is about 0.75 cubic feet, so it takes 36 bags to equal 1 cubic yard. A 1 cubic foot bag takes 27 bags per yard. At roughly $4 to $5 per bag, 36 bags costs $144 to $180 — significantly more than the $30 to $55 typical for a cubic yard of bulk delivery. Bags make sense only for small patches where delivery is impractical.

Four to six inches is the recommended depth for a new lawn. Most turf grasses develop the majority of their root system in the top 6 inches of soil. Less than 4 inches means shallow roots that dry out quickly and struggle in heat. If you are topdressing an existing lawn to fill low spots or improve surface drainage, 0.25 to 0.5 inches is sufficient — more than that risks smothering the existing grass.

Topsoil is the nutrient-rich upper layer of earth — typically the top 5 to 12 inches — containing organic matter, minerals, and the microbial activity that supports plant growth. Fill dirt is subsoil material used for structural grading, raising ground level, or filling large voids. It contains little to no organic matter and does not support plant growth on its own. For any area where you plan to grow grass or plants, use topsoil. For pure grading and leveling beneath a growing layer, fill dirt is less expensive and appropriate.

Standard topsoil weighs approximately 2,000 to 2,800 pounds per cubic yard, with 2,400 pounds (1.2 tons) as a commonly used average for dry material. Wet or clay-heavy topsoil can reach 3,000 pounds or more. Sandy loam runs lighter at around 1,800 to 2,000 pounds. Moisture content is the biggest variable — a cubic yard of freshly dug, wet topsoil can weigh 20 to 30% more than the same soil dried. Bulk suppliers often quote by the ton for this reason.