How Much Does a Yard of Mulch Cover?

The three numbers to remember

One cubic yard is 27 cubic feet. Divide by the depth in feet:

At 2 inches: 27 / (2/12) = 162 square feet.
At 3 inches: 27 / (3/12) = 108 square feet.
At 4 inches: 27 / (4/12) = 81 square feet.

The 3 inch figure is the one to memorize, since 3 inches is the standard bed depth. One yard, one 9 by 12 foot bed, done. The general formula for any depth is coverage = 27 / (depth in inches / 12).

Worked example: 10 yards at 3 inches

Ten yards is a common full-truck delivery. At 3 inches deep:

10 x 108 = 1,080 square feet.

That is roughly a 30 by 36 foot area, or about six 10 by 18 foot beds. At 2 inches the same delivery stretches to 1,620 square feet; at 4 inches it shrinks to 810. Depth is the lever, which is why knowing your target depth matters more than knowing your yard count.

Sizing one yard to a real bed

Run the coverage backward to see what a single yard does for you:

3 inches: 108 sq ft. That is a 9 by 12 foot bed, a 6 by 18 foot border, or a 10 foot diameter circle with room to spare.
2 inches: 162 sq ft. That is a 9 by 18 foot bed, a good top-up depth for refreshing existing beds.
4 inches: 81 sq ft. That is a 9 by 9 foot bed, the depth for a fresh tree and shrub installation.

Half a yard does exactly half of each: 54 square feet at 3 inches, which is a 6 by 9 foot patch. Small jobs like a single tree ring rarely need a full yard, which is why the bag math matters.

Coverage table: yards to square feet

At 2 inches / 3 inches / 4 inches:

0.5 yard: 81 / 54 / 41 sq ft.
1 yard: 162 / 108 / 81 sq ft.
2 yards: 324 / 216 / 162 sq ft.
5 yards: 810 / 540 / 405 sq ft.
10 yards: 1,620 / 1,080 / 810 sq ft.

Use the table to sanity-check any estimate. If someone tells you 2 yards will cover 500 square feet at 3 inches, the table says 216, and they are off by more than double.

Bag coverage for comparison

One 2 cubic foot bag covers 12 square feet at 2 inches, 8 square feet at 3 inches, and 6 square feet at 4 inches. So a yard's worth of coverage (108 sq ft at 3 inches) is 13.5 bags, which is why you buy 14. When a project needs less than half a yard of coverage, bags are usually the simpler buy.

What a cubic yard looks like when it arrives

A dumped cubic yard of mulch makes a pile roughly 3 feet tall and 5 to 6 feet across at the base. It is about one heaped pickup bed or one large loader bucket. Ten yards is a full dump truck load and covers a driveway-sized footprint before you start spreading, so clear the drop spot before the truck arrives.

Rounding and the settle factor

Mulch settles 10 to 20 percent in the first weeks as it compacts and the fluffy factory volume packs down. The coverage numbers above are for settled depth, so order to the settled target and let the initial fluff be your margin. If your project lands within 10 percent of the next half yard, round up; the cost of a thin spot showing through in July is a second delivery.