Topsoil Cubic Yard Calculator

How to calculate topsoil cubic yards

Measure the footprint in feet and decide how much new finished soil depth the project requires. Multiply length × width in feet by depth in inches, then divide by 324. A 30 × 20-foot yard area is 600 sq ft; at 4 inches thick, it requires 600 × 4 ÷ 324 = 7.41 cubic yards of geometric volume.

For multiple beds, measure each section and sum the cubic yards. If you already know total square footage, use area (sq ft) × depth (in) ÷ 324. For nonuniform filling or grading, a single depth may hide large differences; use measured sections or professional grade data when accuracy matters.

Topsoil depth chart for lawn and garden projects

The table shows the geometric cubic yards needed to add a uniform layer across 100 square feet. It does not define the best depth for a particular plant, soil or landscape situation. A 2-inch topdressing, a new lawn on compacted subsoil and a deeper planting bed have different needs.

New lawn preparation versus established lawn topdressing

These are separate projects and should not share a single default depth. When establishing new turf after construction, roots may face compacted or low-quality subsoil. Penn State Extension's lawn-establishment guidance ↗ describes 4 to 6 inches of suitable, firmed topsoil for establishing good-quality turf and integrating the upper material with underlying soil where appropriate.

By contrast, established turf topdressing typically uses a much shallower application, carefully worked into the existing grass canopy; burying grass under several inches of soil can harm it. Do not use a full new-lawn soil depth when calculating a routine topdress. Select depth based on the actual maintenance practice, and consult local extension guidance for turf type and conditions.

Topsoil versus garden soil, planting mix and compost

Topsoil refers to an upper soil material, but a product sold as 'topsoil' may contain varying proportions of sand, silt, clay and organic matter. Screened topsoil usually has large debris removed, although screening alone does not guarantee fertility or a suitable soil structure. Raised-bed planting mixes can contain different amendments and may be sold by volume.

Compost is primarily an organic soil amendment, not always a complete replacement for mineral topsoil. A garden that needs improved organic matter may require a very different material from a yard that needs several inches of soil to establish a new grade. Calculate each product separately, and ask for the supplier's composition and intended uses.

How much soil is needed for a raised bed or planting area?

For a rectangular raised bed, multiply the inside length and width by the actual unfilled height you plan to add, then convert to cubic yards. A 4 × 8-foot bed filled 12 inches deep requires 4 × 8 × 12 ÷ 324 = 1.19 cubic yards. If the bottom contains existing soil, logs or another planned layer, measure only the portion that will actually be filled with the selected planting soil.

Do not assume that an entire planter must be filled with generic topsoil. The crop, drainage, local climate and soil blend influence the material selection. Multiple beds may have different dimensions and settled heights, so a small sketch and separate quantities help avoid an unexpectedly large purchase.

Soil settling: loose delivered yards versus finished depth

The volume in a delivery truck may differ from the volume of soil after watering, spreading and settling. Moisture, texture, organic matter and placement methods affect how much a loose soil pile changes. A universal percentage is not reliable for all topsoil products, particularly when comparing screened mineral soil with a highly organic planting mix.

Ask the supplier whether the material is sold by loose cubic yard and whether it can provide product-specific recommendations for finished coverage. The calculator's extra allowance can model a scenario, but it does not compute soil shrinkage or guarantee settled grade.

Checking topsoil quality before you buy

The cheapest bulk topsoil may not be suitable for lawns or gardens. Ask about screening, visible debris, weed contamination, texture, organic matter and whether a representative soil analysis is available. A soil test can clarify pH and nutrients for the intended plants, while texture and drainage characteristics affect root growth and water movement.

Avoid spreading excessively wet soil with heavy equipment, as compaction can damage pore space and water infiltration. Consider how the delivered soil will blend with existing subsoil: an abrupt interface can affect drainage or root penetration. If the goal is a large grade change rather than a suitable growing layer, fill dirt estimation addresses that different use case.

Topsoil delivery and bulk pricing

Compare prices in the same unit. If a supplier quotes topsoil by cubic yard, multiply the estimated purchase quantity by the stated price per cubic yard. If bags are offered instead, check each bag's cubic-foot volume and compare it with the total cubic feet required. One cubic yard is exactly 27 cubic feet, before any supplier or project adjustment.

Include delivery minimums, access limitations, unloading location and the cost of moving and spreading material. A truck might be limited by payload weight even when its bed has additional volume. Moist soil can weigh substantially more than drier soil of the same bulk volume; do not rely on a fixed tons-per-yard value.

Topsoil planning mistakes and final checklist

Before ordering, confirm the actual footprint, finished thickness, whether you are replacing or topping up existing soil, and what product is appropriate for the job. Measure low and high points in an uneven yard. Verify the soil blend and whether the supplier quotes a loose volume. Keep landscaping material estimates separate from the grading or structural-fill quantities.

Avoid using a new-lawn depth for established-lawn topdressing, estimating a raised-bed fill from its full exterior height, ignoring soil already in the bed, or assuming the word 'screened' guarantees plant suitability. Our cubic yard coverage chart can help visualize the effect of changing soil depth.