A yard of mulch covers about 100 to 150 square feet at a typical depth

One cubic yard of mulch is a volume measurement—it equals 27 cubic feet of material. When spread at the standard depth for garden beds (2 to 3 inches), a single cubic yard will cover roughly 100 to 150 square feet. The exact coverage depends on how deep you spread it: at 2 inches deep, you get closer to 150 square feet; at 3 inches deep, you get closer to 100 square feet.

Most home gardeners order mulch by the cubic yard because that is how landscape suppliers and garden centers measure and sell it. Understanding this measurement helps you figure out how many yards to order before the truck arrives, so you do not end up short or with a pile left over.

Key Takeaways

  • One cubic yard of mulch covers 100 to 150 square feet when spread 2 to 3 inches deep, which is the recommended depth for most garden beds.
  • A cubic yard contains 27 cubic feet of material, and you can calculate your own coverage by dividing the square footage of your bed by the depth in feet.
  • Mulch settles and compacts over time, so ordering 10 to 15 percent extra accounts for settling in the first few weeks.
  • Different mulch types (shredded bark, wood chips, pine straw) have slightly different weights and coverage rates, but volume stays the same at one cubic yard.

How to calculate coverage for your specific garden beds

Measure the length and width of each bed in feet, then multiply them together to get square footage. Add up all your beds. Divide that total by the depth you want in feet—so if you want 2.5 inches deep, convert that to feet (2.5 ÷ 12 = 0.21 feet) and divide your total square footage by 0.21. The result is how many cubic yards you need.

Example: You have a bed that is 10 feet long and 4 feet wide (40 square feet). You want it 2.5 inches deep. Divide 40 by 0.21, and you get roughly 190 square feet of coverage needed, which means you need about 1.3 cubic yards for that one bed.

Most suppliers will round up to the nearest half or full yard, so in that example you would order 1.5 yards. It is better to have a small amount left over than to run short partway through spreading.

Why depth matters more than you might think

Mulch at 1 inch deep does not suppress weeds effectively and dries out quickly in sun. At 2 inches, you get solid weed control and moisture retention for most climates. At 3 inches or deeper, you risk smothering shallow-rooted plants and creating a habitat for slugs and fungal growth, especially in wet regions.

The 2 to 3 inch range is the sweet spot for most home gardens. Stick to that, and your mulch will do its job—keeping soil cool, reducing water loss, and blocking weeds—without creating problems. If you live in a very hot, dry climate, lean toward 3 inches; if you are in a humid area with heavy rain, stay closer to 2 inches.

Account for settling when you place your order

Fresh mulch settles and compacts as it absorbs moisture and as you walk on it. Within the first two to four weeks, you may lose 10 to 15 percent of the depth you initially spread. This is normal and expected.

To account for this, order about 10 to 15 percent extra material. If your calculation says you need 5 cubic yards, order 5.5 to 6 yards instead. You can use the extra to top up beds in a few weeks, or spread it thinner across a larger area. It is easier to use extra mulch than to place a second order and pay delivery fees again.

Different mulch types and how they compare

Shredded hardwood bark, wood chips, pine straw, and recycled wood fiber all sell by the cubic yard, and one yard of each type covers the same square footage—about 100 to 150 square feet at 2 to 3 inches deep. The volume does not change. What differs is weight, how long it lasts, and how it looks.

Shredded bark breaks down slowly and holds color well. Wood chips are chunkier and settle less. Pine straw is lightweight and works well in acidic soil but blows around in wind. Recycled wood fiber is dense and stays in place. For coverage calculations, treat them all the same: one cubic yard covers roughly the same area regardless of type. Your choice depends on appearance, how long you want it to last, and your soil type.

Common mistakes when ordering mulch

The biggest mistake is underestimating square footage. Measure twice. The second mistake is spreading too thin—1 inch looks like you did something, but it will not control weeds or retain moisture. Spread at least 2 inches, and do not feel bad about ordering extra.

A third mistake is piling mulch against tree trunks and plant stems. Mulch should sit 2 to 3 inches away from any trunk or stem to prevent rot and pest problems. This means your actual coverage area is slightly smaller than your bed dimensions, so account for that when you measure.

Finally, do not assume all suppliers measure the same way. Some sell "loose" mulch (fluffier, less settled), and some sell "compressed" mulch (denser, more settled). A cubic yard is always 27 cubic feet by volume, but loose mulch may settle more after delivery. Ask your supplier whether their mulch is loose or compressed, and factor that into your order if you are ordering from a new place.

Frequently Asked Questions

How much does a cubic yard of mulch weigh?

Shredded bark typically weighs 400 to 600 pounds per cubic yard depending on moisture content. Wood chips are lighter, around 300 to 500 pounds. Pine straw is the lightest at 100 to 150 pounds. Weight matters if you are spreading it yourself or if your driveway has weight limits, but it does not change the coverage—one cubic yard is still one cubic yard by volume.

Can I order mulch by the bag instead of by the yard?

Yes, but it costs more per volume. A typical bag holds 2 to 3 cubic feet. To cover a 100-square-foot bed at 2.5 inches deep, you would need about 9 to 10 bags. Bags work well for small projects or touch-ups, but for anything larger than a few beds, ordering by the yard is cheaper and requires less hauling.

Should I put landscape fabric under mulch?

Landscape fabric blocks weeds but also blocks water and air from reaching soil. Most gardeners skip it in established beds and rely on mulch depth alone. If you are starting a new bed with heavy weed pressure, fabric can help, but you will still need 2 to 3 inches of mulch on top for it to work. The mulch does most of the work either way.

How often do I need to add more mulch?

Shredded bark lasts 1 to 2 years before breaking down significantly. Wood chips last 2 to 3 years. Pine straw lasts about 1 year. Top up beds every year or two with a fresh 1 to 2 inches to maintain weed control and moisture retention. You do not need to remove old mulch—just spread new material on top.

What if I have an oddly shaped bed?

Break it into rectangles or triangles, calculate the area of each section, add them together, then use the standard formula (total square footage ÷ depth in feet). For a circular bed, measure the radius, multiply it by itself, multiply by 3.14, then divide by depth in feet. Most suppliers are used to rounding up, so do not stress over exact precision—order a half yard more than your calculation suggests.