Cubic Yard Coverage Chart

Coverage formula: cubic yards to square feet

Coverage = cubic yards × 324 ÷ depth in inches. This formula follows directly from one cubic yard being equal to 27 cubic feet. Spread that volume one inch (one-twelfth foot) deep and it covers 27 ÷ (1/12) = 324 square feet.

For example, 2 cubic yards spread 3 inches deep cover 2 × 324 ÷ 3 = 216 square feet. At 4 inches deep, the same volume covers 162 square feet. Depth must be positive and measured in inches for this version of the formula. The result assumes a flat, uniform finished layer.

Coverage table for one cubic yard

The following values show the geometric coverage of exactly one cubic yard at common depths. It is useful for comparing a shallow mulch layer with a deeper gravel or soil layer, but it does not recommend a particular application thickness. Appropriate depth depends on the material and project.

How many square feet can 2, 3, 5 or 10 yards cover?

To scale coverage for a larger delivery, multiply the one-yard figure by the number of cubic yards. For instance, five cubic yards at a uniform 3-inch depth cover 5 × 108 = 540 square feet. The following reference table is intended for quick volume-to-area comparisons before buying materials.

Reverse the chart: how many yards are needed for a known area?

If area and depth are known, calculate cubic yards = area in square feet × depth in inches ÷ 324. A 500-square-foot area at 3 inches deep requires 500 × 3 ÷ 324 = approximately 4.63 cubic yards. This is the inverse of the coverage formula, not a different method.

A 1,000-square-foot area at 2 inches deep takes about 6.17 cubic yards. At 4 inches it takes about 12.35. These calculations describe geometric space and should not be treated as supplier delivery quantities unless the delivery is measured in the same state.

Coverage examples for mulch, gravel and topsoil

A bed covered in bark mulch at a specified depth is a classic volume-and-area calculation. With 3 cubic yards of mulch at 3 inches deep, the theoretical coverage is 324 square feet. For a gravel path at 4 inches, 3 cubic yards cover about 243 square feet, before aggregate-specific compaction adjustment.

For a topsoil layer 2 inches deep, 3 cubic yards cover 486 square feet geometrically. But loose screened topsoil can settle, and a finished compacted base is different from the loose volume delivered by truck. Use dedicated material pages, such as the mulch calculator, gravel calculator and topsoil calculator, to check practical requirements.

How to calculate coverage for irregular beds

Split a curved bed into measurable sections or calculate the area of geometric shapes. A circular bed has an area of π × radius². A triangular region has an area of one-half base × perpendicular height. If there are holes or planting zones you will not cover, subtract those areas from the total before applying depth.

For a garden with a rectangular section and a circular section, calculate each square-foot area, add them together if the depths are identical, and convert to cubic yards. When depth differs, calculate the volume of each section separately. This avoids hiding meaningful differences in an unsupported average.

When the coverage chart is not a reliable order estimate

Actual coverage can differ because of uneven surfaces, installation waste, material settlement and compaction. A 4-inch-deep finished gravel base may need a larger loose quantity, but there is no universal conversion percentage for every aggregate. Wet soil and dry soil can also behave differently in delivery and placement.

Measure the actual finished depth required, ask whether the material is sold by loose cubic yard, compacted cubic yard or weight, and check supplier minimums. Do not interpret an approximate coverage chart as a site survey, engineering recommendation or guaranteed yield.

How the chart is calculated and checked

Every reference value is derived from the exact relationship of 27 cubic feet per cubic yard and 12 inches per foot. The general equation can also be written as area = cubic feet ÷ depth in feet. Both produce the same numerical answer when the units match.

Keep full numeric precision until the final displayed number. We document these measurement definitions in the calculation methodology, with the underlying unit standards in the NIST Guide to SI.