Calculate Soil Yardage: Volume, Formula & Examples

Calculate soil yardage by multiplying the area to cover by the soil depth, then converting the resulting volume to cubic yards. Enter the area in square feet and depth in inches to find the cubic yards needed, along with the equivalent volume in cubic feet.

Formula

For a level area measured in square feet and depth measured in inches:

Cubic yards = area × depth ÷ 324

• Area is the surface to cover, in square feet (ft²).
• Depth is the intended soil thickness, in inches (in).
• 324 is the number of square-foot-inches in one cubic yard: 3 feet × 3 feet × 3 feet equals 27 cubic feet, and 27 × 12 = 324.

The companion cubic-foot calculation is cubic feet = area × depth ÷ 12. One cubic yard equals 27 cubic feet, or approximately 0.765 cubic meters. If working entirely in metric, multiply area in square meters by depth in meters to get cubic meters; divide that result by 0.7646 to convert to cubic yards.

Worked Example

Using the calculator defaults—100 square feet and a depth of 3 inches:

1. Multiply area by depth: 100 × 3 = 300 square-foot-inches.
2. Convert to cubic yards: 300 ÷ 324 = 0.9259 cubic yards.
3. Round to two decimal places: 0.93 cubic yard.
4. Convert to cubic feet: 100 × 3 ÷ 12 = 25 cubic feet.

The two results agree because 25 ÷ 27 = 0.9259 cubic yards before rounding.

How to Measure the Area and Depth

For a rectangle, multiply length by width, using the same unit for both. A 10-by-10-foot bed has an area of 100 square feet. For an L-shaped or irregular space, split it into rectangles or other measurable shapes, calculate each area, and add them. For a circle, area is π × radius²; measure the radius from the center to the edge.

Measure the planned soil depth in inches if using this calculator. Depth should describe the layer you want to add, not necessarily the total depth of an existing bed. If the ground is uneven, measure several spots and use a reasonable average depth, or calculate separate zones if the differences are substantial.

• Keep dimensions consistent: convert feet and inches before calculating area.
• For multiple beds or planting zones, calculate each separately and add the volumes.
• For a border or narrow strip, use the actual soil-covered width rather than the entire garden’s dimensions.

How to Interpret the Result

The answer is a volume, not a weight. Cubic yards tell you how much space the soil occupies; they do not tell you how many pounds or tons it weighs. Soil weight varies with its composition and moisture, so a volume calculation cannot reliably be turned into weight without product-specific information.

Likewise, the result describes the geometric volume at the depth entered. It does not automatically account for settling, compaction, uneven ground, or soil lost during handling. If you need a precise fill level, prepare the area and use the depth that will remain after the soil is placed and settled. When estimating a delivery, consider whether the supplier sells whole or fractional cubic yards and confirm its order increments separately.

Common Calculation Mistakes

• Using the wrong conversion factor: with square feet and inches, divide by 324 for cubic yards. Dividing by 27 is appropriate only after the volume is already in cubic feet.
• Mixing units: multiplying square feet by a depth in feet gives cubic feet, not square-foot-inches. Either use area × inches ÷ 324 for cubic yards, or area × feet ÷ 27.
• Rounding too early: keep the unrounded area and volume through the calculation, then round the final result. Small rounding errors can add up across several sections.
• Forgetting the real shape: using the outside dimensions of an irregular garden may count paths, paving, or areas that do not need soil.
• Confusing volume with coverage: a cubic yard covers different areas at different depths. It is not a fixed coverage amount without a specified depth.

How Much Extra Soil Should You Allow?

The calculated quantity is the straightforward volume needed to fill the stated area to the stated depth. It is not a universal order quantity: soil condition, delivery handling, installation method, and the desired finished level affect how much material is practical to obtain. Avoid applying an arbitrary percentage as if it were a formula. If the ground is uneven or you need a raised bed, measure the actual sections and calculate them separately; for product-specific settling or coverage guidance, check the supplier’s information.

For raised beds, calculate the soil volume inside the bed rather than using its outside footprint when the walls have noticeable thickness. If a bed has several layers or different materials, calculate each layer’s area and depth independently. Add their volumes only if you are ordering them together; keep the materials distinct if they serve different purposes.

Frequently Asked Questions

How many cubic yards of soil do I need for 1,000 square feet?
It depends on depth. At 3 inches, calculate 1,000 × 3 ÷ 324, which is about 9.26 cubic yards. At 6 inches, the amount doubles to about 18.52 cubic yards.

How many square feet does one cubic yard cover?
Coverage depends on how deep the soil is spread. One cubic yard is 27 cubic feet, so at a depth of 1 inch it covers 324 square feet; at 3 inches, it covers 108 square feet; at 6 inches, it covers 54 square feet, before allowing for site conditions.

How do I calculate soil in cubic feet?
Multiply area in square feet by depth in feet. If depth is in inches, use area × depth ÷ 12. Divide cubic feet by 27 to convert to cubic yards.

Is a cubic yard the same as a ton of soil?
No. A cubic yard measures volume, while a ton measures weight. The weight of a yard of soil varies with its composition and moisture, so ask for the specific material’s weight information if a weight estimate is required.

Should I include soil settling in the calculation?
The formula gives the volume for the area and depth you enter; it does not predict settling. The amount of settling varies by soil and placement conditions. Use relevant supplier guidance or plan and measure the finished depth rather than assuming a fixed allowance.

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in area | Area | sq ft | 100 | 0
in depth | Depth | in | 3 | 0
out yards | Soil needed | cubic yd | area * depth / 324 | 2
out feet | Soil volume | cubic ft | area * depth / 12 | 2