BAG VOLUME
How many cubic feet in a bag of mulch?
There is no single answer, because bagged mulch is sold in several volumes and the number is printed on the bag. The sizes you will actually find on a shelf are 1, 1.5, 2 and 3 cubic feet for wood mulch, and 0.8, 1.25, 1.5 and 2 cubic feet for rubber. Two cubic feet is the most common, but assuming it is the only way to end up with the wrong number of bags.
Where to find the number
It is on the front of the bag near the weight, usually as a large figure followed by "cu ft". It is a volume, not a weight, and the two are not interchangeable — a 40 lb bag and a 50 lb bag can both hold 2 cubic feet, with the heavier one simply carrying more water. If a listing gives only the weight, look for the cubic-foot figure elsewhere on the product page; without it a bag count cannot be calculated.
What one bag covers at each depth
Coverage is bag cubic feet × 12 ÷ depth in inches. That gives:
| Depth | 1 cu ft | 1.5 cu ft | 2 cu ft | 3 cu ft |
|---|---|---|---|---|
| 1 inch | 12.0 | 18.0 | 24.0 | 36.0 |
| 2 inches | 6.0 | 9.0 | 12.0 | 18.0 |
| 3 inches | 4.0 | 6.0 | 8.0 | 12.0 |
| 4 inches | 3.0 | 4.5 | 6.0 | 9.0 |
The familiar figure "one 2 cubic foot bag covers 8 square feet" is the 3-inch row. At 2 inches the same bag covers 12 square feet, and at 1 inch it covers 24 — so a coverage figure is meaningless without the depth it was measured at.
How many bags are in a cubic yard
A cubic yard is 27 cubic feet, so the count is 27 ÷ bag cubic feet, rounded up because bags are sold whole:
- 1 cubic foot bags: 27 per yard
- 1.5 cubic foot bags: 18 per yard
- 2 cubic foot bags: 13.5 exact, so 14 to cover a yard
- 3 cubic foot bags: 9 per yard
This is the number that turns a bulk quote into a comparison with bagged mulch. A cubic yard priced at $45 against 14 bags of 2 cubic feet at $3.33 is $46.62 — close enough that delivery cost decides it, which is why the dated yard price check converts everything to price per cubic foot.
Rubber mulch uses different sizes again
Rubber bags run smaller: 0.8, 1.25, 1.5 and 2 cubic feet. At a 2-inch layer a 0.8 cubic foot bag covers 4.8 square feet, so a 200 sq ft bed needs 42 of them — against 17 bags if the product came in 2 cubic foot bags. The rubber mulch calculator returns all four counts at once.
The one rule worth remembering
Read the cubic-foot figure off the bag you are actually buying, then do the arithmetic once, at the end. The bag count guide has the per-100-square-foot tables, and the 2 cubic foot coverage page goes deeper on the most common size.
Related reading: How much does a bag of mulch weigh — the weight range by bag size, and why it is the wrong number to order from.