How Many Bags of Mulch in a Yard? Bag Counts by Bag Size, Depth, and Mulch Type
How many bags of mulch are in a yard depends entirely on the bag size printed on the label: 13.5 bags at 2 cu ft, 18 bags at 1.5 cu ft, 9 bags at 3 cu ft, and 27 bags at 1 cu ft.
Mulch Bag Calculator: Bags Needed by Bag Size and Mulch Type
Bags of Mulch per Cubic Yard by Bag Size
A cubic yard is always 27 cubic feet. Divide 27 by the bag volume and you have your answer. The only catch is the 2 cu ft bag, which does not divide evenly, so you buy 14 to get a full yard.
| Bag size | Bags in 1 cubic yard | Bags to buy for 1 full yard |
|---|---|---|
| 1 cu ft | 27.0 | 27 |
| 1.5 cu ft | 18.0 | 18 |
| 2 cu ft | 13.5 | 14 |
| 3 cu ft | 9.0 | 9 |
In the US, the 2 cu ft bag is the most common size for shredded hardwood, cedar, cypress, and dyed mulch. Pine bark nuggets and some rubber mulch brands are often sold in 1.5 cu ft bags, and big-box stores stock 3 cu ft bags of some wood mulch, especially during spring sales. The Home Depot mulch calculator defaults to 1.5 cu ft bags and a 3 in. depth, while Lowe's notes on its mulch and soil calculator that a standard bag blankets about 6 square feet, which is the 1.5 cu ft bag spread 3 in. deep. Always read the cubic feet on the bag before you do the math; a 2 cu ft bag and a 1.5 cu ft bag look almost identical on the pallet.
Coverage per Bag at 2, 3, and 4 Inches
Coverage in square feet is bag volume in cubic feet times 12, divided by depth in inches. This is where most people undercount, because a bag that covers 12 sq ft at 2 in. only covers 6 sq ft at 4 in.
| Bag size | 2 in. deep | 3 in. deep | 4 in. deep |
|---|---|---|---|
| 1 cu ft | 6.0 sq ft | 4.0 sq ft | 3.0 sq ft |
| 1.5 cu ft | 9.0 sq ft | 6.0 sq ft | 4.5 sq ft |
| 2 cu ft | 12.0 sq ft | 8.0 sq ft | 6.0 sq ft |
| 3 cu ft | 18.0 sq ft | 12.0 sq ft | 9.0 sq ft |
Bags Needed for a 100 Square Foot Bed
A 10 ft by 10 ft bed is the most common reference size. The bag counts here are rounded up to whole bags with no extra allowance.
| Depth | Volume | 1 cu ft bags | 1.5 cu ft bags | 2 cu ft bags | 3 cu ft bags | Bulk |
|---|---|---|---|---|---|---|
| 2 in. | 16.7 cu ft | 17 | 12 | 9 | 6 | 0.62 cu yd |
| 3 in. | 25.0 cu ft | 25 | 17 | 13 | 9 | 0.93 cu yd |
| 4 in. | 33.3 cu ft | 34 | 23 | 17 | 12 | 1.23 cu yd |
For other bed sizes, scale by area: a 150 sq ft bed at 3 in. needs 37.5 cu ft, or 19 bags of 2 cu ft mulch (1.39 cu yd in bulk).
How Deep Should Each Type of Mulch Be?
The right depth is not one number. It changes with how coarse the material is and how well your soil drains, and that is what moves the bag count more than anything else.
Shredded hardwood and shredded bark: 3 inches
Shredded mulch is the default for most beds. Extension guidance across the Midwest lands on 2 to 4 inches as the working range; University of Illinois Extension recommends 2 to 4 in. and warns that thicker layers mat down and shed water. A 3 in. target is the safe middle, and it is the depth both big-box calculators assume.
Wood chips and bark nuggets: 3 to 4 inches
Coarse material lets air and water through, so it tolerates a deeper layer. Iowa State University Extension advises 3 to 4 inches of wood chips or shredded bark on well-drained sites around trees and shrubs, but only 2 to 3 inches on heavy clay soils where a deep layer can waterlog the root zone. Keep the mulch at least 6 in. away from tree trunks.
Fine mulch (compost, leaf mold, cocoa hulls): 1 to 2 inches
Fine-textured mulch packs tightly and can shed water or go sour if it is too deep. The University of Maryland Extension keeps bark and wood chips at 1 to 3 in. and sawdust at just 1 in. A 2 in. layer of fine material does the same weed-blocking job as 3 in. of coarse chips.
Rubber mulch: 2 inches for beds
Rubber does not decompose, settle, or need topping off, so a thinner layer holds its depth for years. Lowe's lists 2 to 3 inches for its bagged rubber mulch, and most 1.5 cu ft rubber bags state coverage at a 2 in. depth. Note that rubber bags are often 0.8 to 1.5 cu ft, smaller than wood mulch bags, and they weigh about 40 lb each. Playground surfacing under swings and climbers follows a separate fall-height standard and is a different project; this page covers landscape beds only.
Bagged vs Bulk: When the Yard Math Changes Your Purchase
The per-yard conversion is useful because bulk mulch is sold by the cubic yard, delivered or loaded into a pickup. A short-bed pickup holds roughly 1 to 1.5 cu yd of wood mulch, which is the equivalent of hauling 14 to 20 bags of 2 cu ft mulch home from the garden center.
Once a project passes about 2 cubic yards (roughly 27 to 28 two-cubic-foot bags), bulk is usually the better deal. Bagged mulch at $3 to $5 per 2 cu ft bag works out to $40 to $68 per yard, while bulk hardwood runs $25 to $50 per yard before delivery, though bulk delivery fees can erase that savings on a single-yard order. Bags also have advantages that have nothing to do with price: they are easier to carry to a back bed, they stay dry in storage, and dyed bagged mulch is more consistent in color than bulk.
Common Mistakes That Leave You Short
Reading 1.5 cu ft as 2 cu ft. The bags are the same physical size, and the conversion jumps from 13.5 to 18 bags per yard. Check the label.
Forgetting the old mulch. If you already have 1 in. of last year's mulch, you only need to add 2 in. to reach 3 in. Measure what is there before you buy.
Skipping the extra for settling. Shredded wood mulch settles 10 to 20 percent within the first season. Buying 10% extra on a new bed keeps you from going back for two more bags; on a top-dress it is usually unnecessary.
Measuring only the straight edges. Curved beds are easy to underestimate. Break them into rectangles and triangles, or pace the length and average width, and round up.
Mulching against trunks and stems. Depth is measured in the open bed, not against the plant. Pull the mulch back from trunks and keep it off the crowns of perennials. The bag count does not change, but the plant survives.
FAQ
How many bags of mulch do I need for a yard?
For a full cubic yard, buy 14 bags of 2 cu ft, 18 bags of 1.5 cu ft, 9 bags of 3 cu ft, or 27 bags of 1 cu ft mulch.
How many 1.5 cubic feet bags of mulch are in a yard?
18 bags. A cubic yard is 27 cubic feet, and 27 divided by 1.5 is exactly 18.
How much will 20 bags of mulch cover?
Twenty 2 cu ft bags hold 40 cubic feet, which covers 240 sq ft at 2 in., 160 sq ft at 3 in., or 120 sq ft at 4 in. With 1.5 cu ft bags, 20 bags hold 30 cubic feet and cover 180, 120, or 90 sq ft at those depths.
Is it cheaper to buy mulch by the bag or in bulk?
Bulk is usually cheaper once you need more than about 2 cubic yards, as long as you can pick it up or the delivery fee is reasonable. For a single bed or a top-dress, bags are often the same price or cheaper once you include delivery, and they are far easier to handle.
How many square feet does a yard of mulch cover?
One cubic yard covers 162 sq ft at 2 in., 108 sq ft at 3 in., or 81 sq ft at 4 in. The formula is 324 divided by the depth in inches.
Related Guides
Linking this page to a mulch and soil hub on your site is recommended.
References
- Iowa State University Extension: How deep should the mulch layer be around trees and shrubs?
- University of Illinois Extension: Proper Mulching Techniques
