How many bags of mulch make a cubic yard

Bags per cubic yard, by bag size

A cubic yard is 27 cubic feet, and a bag of mulch is labeled in cubic feet, so the count is one division. Iowa State's extension guide puts the common sizes at 2 and 3 cubic feet. Scotts sells 1.5 and 2 cubic foot bags, Jolly Gardener 2 and 3.

Bag size	Bags in one cubic yard	Bags to buy	Who sells it
1.5 cu ft	18	18	Scotts Nature Scapes
2 cu ft	13.5	14	Scotts, Jolly Gardener
3 cu ft	9	9	Jolly Gardener

Fourteen bags of 2 cubic feet is 28 cubic feet, half a bag over a yard. The half-bag has nowhere to go, so a yard in that size is always 14. The multiples follow: 2 yards is 27 bags of 2 cubic feet (54 ÷ 2), 18 of 3 cubic feet, 36 of 1.5.

From a bed to a bag count

Bags are bought for a bed, not for a yard, so the useful arithmetic starts with the bed's area and the depth. Multiply square feet by depth in inches, divide by 12 for cubic feet, then divide by the bag size and round up.

Bed	Depth	Cubic feet	2 cu ft bags	3 cu ft bags	1.5 cu ft bags	Bulk
12 × 8 ft bed	3 in	24	12	8	16	0.89 yd
3 × 30 ft border	2 in	15	8	5	10	0.56 yd
Tree ring, 8 ft across	3 in	12.6	7	5	9	0.47 yd
450 sq ft of beds	3 in	112.5	57	38	75	4.17 yd

The tree ring is 3.1416 × 4 × 4 = 50.3 square feet at a 4 ft radius, less the trunk. The extension sources say to leave it bare anyway. The mulch calculator takes several beds of different shapes and depths and gives one bag count and one bulk figure for the lot.

What one bag covers

Reading the table the other way is quicker in the aisle. A 2 cubic foot bag covers 12 square feet at 2 inches and 8 square feet at 3 inches. A 3 cubic foot bag covers 18 and 12. For comparison, a yard covers 162 square feet at 2 inches and 108 at 3, which matches Utah State's extension rule. That rule says a 2 inch layer takes about 6 cubic yards per 1,000 square feet. A 1.5 cubic foot bag covers 9 square feet at 2 inches and 6 at 3, which is why small bags take so many trips.

Bags back to yards

A pile of bags converts the same way in reverse: bags times cubic feet per bag, divided by 27. Twenty 2 cubic foot bags are 40 cubic feet, 1.48 yards; thirty 3 cubic foot bags are 90 cubic feet, 3.33 yards. The count matters when a bulk supplier quotes a half-yard minimum. It tells you whether the bag pile on the pallet is more or less than that.

Weight, and the pickup question

No maker read prints a weight on a mulch bag. The bag is sold by volume, and the weight depends on how wet the wood is. The published bulk densities set the range. Chipped brush weighed over 30 truckloads at a Minnesota yard-waste site averaged 13 lb per cubic foot. Cornell's compost tables give wood chips 19.4 lb per cubic foot at 47 percent moisture. A federal conservation guide allows 0.3 to 0.5 ton per cubic yard, 22 to 37 lb per cubic foot. A 2 cubic foot bag is therefore roughly 26 to 74 lb, and a 3 cubic foot bag 39 to 111 lb. A yard of bulk mulch is 350 to 1,000 lb. All of that fits a pickup. A standard bed holds about 3 cubic yards by one city's loading note, and even 14 wet bags are under 1,100 lb.

Bag or bulk

Bulk mulch is priced per yard and bags per cubic foot, and for a small bed the delivery fee can outweigh the bulk saving. The break-even is the delivery fee divided by the difference in price per cubic foot. Work it with your own two prices. One is the bag price divided by its cubic feet. The other is the bulk price per yard plus delivery divided by 27 times the yards ordered. Fourteen bags a yard is the multiplier that turns a bag price into a per-yard price for the comparison. The mulch calculator does this arithmetic for the beds you enter. How deep mulch should be settles the other half of the order, the depth of each bed.