A standard bag of mulch holds between 2 and 3 cubic feet, which equals roughly 0.07 to 0.11 cubic yards
Most bags you buy at a garden center or home improvement store contain 2 cubic feet of mulch. Some brands sell 3 cubic foot bags, and a few offer smaller 1.5 cubic foot bags. Since 1 cubic yard equals 27 cubic feet, a single 2 cubic foot bag is about one-fourteenth of a cubic yard.
This matters because landscaping projects are usually measured in cubic yards. If a contractor or calculator tells you that you need 10 cubic yards of mulch, you now know that means roughly 135 to 150 bags—not a number you want to get wrong when you're standing in the checkout line.
Key Takeaways
- A standard 2 cubic foot bag of mulch is approximately 0.074 cubic yards, so you need about 13 to 14 bags to equal 1 cubic yard.
- Bag sizes vary: common sizes are 1.5, 2, and 3 cubic feet, so always check the label before buying.
- To find how many bags you need, multiply your project's cubic yardage by 13.5 (for 2 cubic foot bags) or adjust based on the actual bag size.
- Bulk mulch delivered by the cubic yard is usually cheaper per unit than bagged mulch, especially for projects larger than 5 cubic yards.
Converting bags to cubic yards: the math
The conversion is straightforward once you know the bag size. Divide the cubic feet in your bag by 27 (the number of cubic feet in a yard).
For a 2 cubic foot bag: 2 ÷ 27 = 0.074 cubic yards. For a 3 cubic foot bag: 3 ÷ 27 = 0.111 cubic yards. For a 1.5 cubic foot bag: 1.5 ÷ 27 = 0.056 cubic yards. If you need 10 cubic yards and you're using 2 cubic foot bags, multiply 10 by 27 to get 270 cubic feet, then divide by 2 to get 135 bags.
Why bag sizes differ between brands
Different manufacturers compress mulch to different densities, which is why one brand's "bag" might be 2 cubic feet while another's is 3. Dyed mulch and hardwood mulch are often denser than shredded bark, so they may be sold in smaller bags at the same weight.
Always read the label on the bag itself, not the shelf tag. The cubic footage should be printed clearly on the front or back. If you're ordering online, the product description will list it—usually near the weight.
Calculating bags needed for your project
Start by measuring your garden bed or area in feet. Multiply length by width to get square feet. Then decide how deep you want the mulch—typically 2 to 4 inches. Convert that depth to feet (2 inches = 0.17 feet, 3 inches = 0.25 feet, 4 inches = 0.33 feet) and multiply by the square footage to get cubic feet.
For example: a bed that is 10 feet long, 5 feet wide, and you want 3 inches deep. That's 10 × 5 × 0.25 = 12.5 cubic feet. Divide by 2 (if using 2 cubic foot bags) to get 6.25 bags—so you'd buy 7 bags to be safe.
If your project is large enough that you're thinking in cubic yards, use an online mulch calculator or ask the garden center staff to help you figure it out. Many will do this for free.
When bulk mulch makes more sense than bags
Bagged mulch is convenient for small projects and for people without a truck. But the cost per cubic yard is significantly higher than bulk mulch delivered by the cubic yard. For projects of 5 cubic yards or more, bulk is usually cheaper even after paying for delivery.
Bulk mulch also saves your back—hauling 135 bags is a full day of work. A dump truck delivers 10 cubic yards in minutes. The trade-off is that you need space for the pile and a way to spread it, and you have less control over the exact mulch type if you're ordering from a landscape supplier rather than hand-picking bags.
Bagged mulch storage and shelf life
Unopened bags of mulch can sit for months without degrading, so buying extra and storing them is reasonable if you have the space. Keep them in a dry spot—a garage, shed, or under a tarp—because wet mulch can develop mold or start to break down before you use it.
Once a bag is opened, use it within a few weeks. Mulch exposed to air and moisture will begin to decompose, and you may notice it smells sour or looks discolored. This is normal decomposition, not mold, but it means the mulch is losing its structure.
Common mulch bag sizes at major retailers
| Bag Size | Cubic Feet | Cubic Yards (approximate) | Bags per Cubic Yard |
|---|---|---|---|
| Small | 1.5 | 0.056 | 18 |
| Standard | 2 | 0.074 | 13.5 |
| Large | 3 | 0.111 | 9 |
Home Depot, Lowe's, and local garden centers typically stock 2 cubic foot bags as their standard. Specialty mulches—colored mulch, cedar, or premium hardwood—are sometimes sold in 3 cubic foot bags. Smaller 1.5 cubic foot bags are less common but appear in some regional chains.
The table above shows you exactly how many bags you need to reach 1 cubic yard for each common size. Use it as a quick reference when you're at the store or planning your order online.
Frequently Asked Questions
How many bags of mulch do I need for 100 square feet?
It depends on depth. For 2 inches deep: 100 sq ft × 0.17 ft = 17 cubic feet ÷ 2 = 8.5 bags. For 3 inches: 100 sq ft × 0.25 ft = 25 cubic feet ÷ 2 = 12.5 bags. For 4 inches: 100 sq ft × 0.33 ft = 33 cubic feet ÷ 2 = 16.5 bags. Always round up.
Is a cubic yard the same as a ton of mulch?
No. A cubic yard is a volume measurement; a ton is weight. One cubic yard of mulch weighs between 400 and 800 pounds depending on the type and moisture content. Damp mulch weighs more than dry mulch. If a supplier quotes you by the ton, ask them to convert to cubic yards or vice versa so you're comparing the same thing.
Can I use the bag size from one brand to calculate for another?
Not reliably. Always check the label on the specific bag you're buying. Two brands may both say "standard bag," but one could be 2 cubic feet and another 2.5 cubic feet. The difference adds up fast on large projects.
What if I buy too many bags of mulch?
Store unopened bags in a dry place and use them next season, or save them for touch-ups as your mulch settles and decomposes. Mulch breaks down over time, so you'll need to refresh beds annually anyway. Opened bags should be used within a few weeks.
Should I add extra mulch to account for settling?
Yes, add 10 to 15 percent extra. Mulch compacts and decomposes over the first few months, so a 3-inch layer will settle to closer to 2.5 inches by midsummer. If you want it to stay at 3 inches, buy enough for 3.3 or 3.5 inches initially.