Mulch is sold two ways: by the bag at hardware stores or in bulk by the cubic yard from landscape suppliers. The price per cubic yard is very different between the two, and for any project larger than a couple of flower beds, the math almost always favors bulk delivery. But for small patches, bags are more convenient and there is no delivery fee.
Here is how to convert between bags and cubic yards, and how to figure out which buying method makes sense for your project.
The conversion math
One cubic yard = 27 cubic feet. Bags come in two common sizes:
2 cubic foot bags: 27 / 2 = 13.5 bags per cubic yard. Since you cannot buy half a bag, order 14 bags per cubic yard needed.
3 cubic foot bags: 27 / 3 = 9 bags per cubic yard exactly.
Some suppliers also sell 1.5 cubic foot bags (common with colored or specialty mulch): 27 / 1.5 = 18 bags per cubic yard.
Quick reference:
| Bag size | Bags per cubic yard |
|---|---|
| 1.5 cu ft | 18 bags |
| 2 cu ft | 14 bags (13.5, round up) |
| 3 cu ft | 9 bags |
How much mulch covers what area
Mulch depth depends on the purpose. Decorative mulch for flower beds typically goes 2 to 3 inches deep. Weed suppression works best at 3 to 4 inches. More than 4 inches traps moisture, promotes mold, and can kill plants by overheating roots.
| Mulch depth | 1 cubic yard covers |
|---|---|
| 1 inch | 324 sq ft |
| 2 inches | 162 sq ft |
| 3 inches | 108 sq ft |
| 4 inches | 81 sq ft |
For a 300 square foot bed at 3 inches deep, you need 300 / 108 = 2.8 cubic yards, which rounds up to 3 cubic yards. In 2 cubic foot bags, that is 3 x 14 = 42 bags.
Bags vs bulk: the cost comparison
The price difference is significant on larger projects. Typical pricing:
Bagged mulch: $4 to $7 per 2 cu ft bag. That is $54 to $95 per cubic yard in bags.
Bulk mulch delivery: $25 to $45 per cubic yard for the mulch, plus $50 to $100 delivery fee.
Break-even point: at $30 per yard bulk and $5 per bag, bulk mulch becomes cheaper at about 2.5 to 3 cubic yards if delivery is $75. For larger projects, every yard over the break-even saves you $25 to $65 per cubic yard.
For anything under 2 cubic yards (about 27 bags of the 2 cu ft size), bags are often the right call: no minimum order, no delivery fee, and you can load them yourself. For anything over 3 cubic yards, call a landscape supplier.
Types of mulch and what they cost
Shredded wood or bark mulch: The most common. $25 to $45 per yard bulk. Breaks down over 2 to 3 years and needs annual top-dressing.
Cedar or cypress mulch: Natural insect resistance and slower decomposition. $35 to $60 per yard. Good for areas around foundations.
Dyed mulch (red, brown, black): Colorfast for 1 to 2 seasons before fading. Same coverage as natural mulch. Usually $30 to $50 per yard. Avoid using colored mulch near plants that are sensitive to dye runoff.
Pine straw: More common in the Southeast. Sold by the bale, not by the cubic yard. One bale of pine straw covers about 35 to 50 square feet at 3 inches. Pine straw acidifies soil slightly as it breaks down, which benefits acid-loving plants like azaleas and blueberries.
Rubber mulch: Long lasting (10 or more years), no decomposition. More expensive at $8 to $12 per square foot installed, but requires no annual replacement. Good around play equipment.
How often to top-dress
Organic mulch breaks down. After 1 to 2 years, most beds need a light top-dressing of 1 to 1.5 inches to restore depth and appearance. You do not need to remove the old mulch first; just add on top as it compresses.
The mulch calculator calculates cubic yards, bag count, and cost for any bed dimensions and depth. If you are comparing the cost between bulk and bags for a specific project, the calculator shows the material cost for both options side by side.