Mulch Coverage Chart
One cubic yard of mulch contains 27 cubic feet. How far that goes depends entirely on how deep you spread it: the same cubic yard covers less ground as the layer gets thicker.
Spread from one cubic yard, that works out to about 324 square feet at 1 inch, 162 square feet at 2 inches, 108 square feet at 3 inches, and 81 square feet at 4 inches. These are arithmetic reference points, not depth recommendations — see the depth guidance below before choosing a depth for your own beds.
What Is a Cubic Yard of Mulch?
A cubic yard is a volume measurement equal to 27 cubic feet — a cube three feet on each side. It is the unit bulk mulch suppliers normally sell and price by, which is why coverage questions are usually asked per yard rather than per bag. A cubic yard describes how much material you have, not how much ground it will cover; the area depends on the depth you apply.
Mulch Coverage Chart: Square Feet per Cubic Yard
Each row below is the same one cubic yard of material, spread at a different depth.
| Depth | Area covered by 1 cubic yard |
|---|---|
| 1 inch | 324 sq ft |
| 2 inches | 162 sq ft |
| 3 inches | 108 sq ft |
| 4 inches | 81 sq ft |
Every row in this chart is an arithmetic reference point, not a depth recommendation. A depth appearing here does not mean it is appropriate for your material or your planting — for that, see the depth guidance below.
How Depth Changes Coverage
The arithmetic is a single division. One cubic yard is 27 cubic feet, and a depth in inches is that many twelfths of a foot, so the area one cubic yard covers is 324 divided by the depth in inches. That is why the numbers in the chart fall the way they do: double the depth and you halve the area, because the same volume is being spread twice as thick. Nothing about the material itself enters this calculation — it is pure geometry, and it holds for any loose material measured by the cubic yard.
Choosing a Mulch Depth
Depth is a decision about your planting, not an output of the chart above. University Extension guidance commonly places many common organic landscape mulches around 2 to 4 inches, but that is not a universal depth for every mulch or every application. Texture matters: fine-textured or composted materials are generally kept nearer 2 to 3 inches, while coarse-textured materials are generally applied nearer 3 to 4 inches. Sources genuinely differ rather than converging on one number — guidance for pine needles, for example, runs considerably deeper than for shredded bark — so treat any single figure with caution. Deeper is not automatically better: excessive mulch can interfere with air and water movement and contribute to root or plant problems. If mulch is already present, measure what is there and add only enough to reach the total depth you are aiming for, rather than adding a fresh full layer by default. Keep mulch from touching plant stems and tree trunks. Depth and placement guidance for trees specifically differs from general landscape-bed guidance.
Depth and placement guidance specific to mulching around a tree is covered in a dedicated guide.
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Covering Larger Areas
Coverage scales in direct proportion to the amount of material: at the same depth, two cubic yards cover twice the area of one, and half a cubic yard covers half. The chart therefore works as a per-yard reference for a project of any size. To work out the quantity for your own beds from their measurements, use the mulch calculator linked below rather than working from this chart by hand.
What This Chart Doesn't Cover
This chart is a coverage reference for bulk mulch measured by the cubic yard, and it deliberately stops there. It does not convert cubic yards into bags or tell you how many bags fit on a pallet — bagged quantities are covered by the bags-per-yard guide. It carries no prices; what a cubic yard costs is covered by the yard-price guide. It does not estimate the labor, delivery, or full installed cost of a mulching project, which the installation cost calculator owns. It says nothing about how much mulch weighs or what a vehicle can carry, which belongs to the mulch weight guide. Depth and placement around trees, including how far to keep mulch back from a trunk, belongs to the mulch-around-trees guide, and playground safety-surfacing depth is a separate subject this page does not address.
Sources & How These Numbers Are Calculated
The coverage figures on this page are calculated arithmetic, not sourced claims: they come from the definition of a cubic yard as 27 cubic feet and require no external authority. The depth guidance is different — it is a horticultural recommendation, and it is drawn from the university Extension publications below.
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