YardBatch field guide
Cubic yards, cubic feet, and bags
The same volume, expressed in three ways you will see at the garden center.
YardBatch · Published September 25, 2026
A cubic yard is a unit of volume: a cube 3 feet long, 3 feet wide, and 3 feet high. Multiplying those sides gives 27 cubic feet. This relationship is exact, whether you are measuring mulch, soil, or gravel.
Convert the volume first
Cubic yards × 27 = cubic feet
Cubic feet ÷ 27 = cubic yards
Cubic feet ÷ bag volume = bag count before rounding
Buying whole bags means rounding the bag count up. Do that once at the end, after you have added together the volume for all the areas you plan to fill.
How many bags make one cubic yard?
| Bag volume | Exact equivalent | Whole bags to buy |
|---|---|---|
| 0.5 cu ft | 54 bags | 54 |
| 1 cu ft | 27 bags | 27 |
| 1.5 cu ft | 18 bags | 18 |
| 2 cu ft | 13.5 bags | 14 |
| 3 cu ft | 9 bags | 9 |
Fourteen 2-cubic-foot bags contain 28 cubic feet, slightly more than a cubic yard. You still only need 12 such bags for a project requiring 24 cubic feet; you do not have to round every project to a full yard.
Square feet measure area, not volume
A 100-square-foot bed does not tell you how much material it needs until you know the layer depth. At 3 inches deep, its volume is 100 × (3 ÷ 12) = 25 cubic feet, or approximately 0.926 cubic yards.
The convenient shortcut is area in square feet × depth in inches ÷ 324. The number 324 combines 12 inches per foot and 27 cubic feet per cubic yard.
A ton is a different kind of measurement
A ton measures weight. Converting volume into weight requires the density of the specific material. Do not use the same weight conversion for mulch, soil, and stone. If a bag lists weight only, obtain its volume or the appropriate density from the supplier.
Volume and bag conversion reference: Iowa State University Extension: calculating mulch volume.
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