Quick answer: One cubic yard equals exactly 27 cubic feet—or 36 bags at 0.75 cu ft, 27 bags at 1 cu ft, 18 bags at 1.5 cu ft, 14 bags at 2 cu ft, or 9 bags at 3 cu ft. Round partial bags up.
How many soil bags equal one cubic yard?
| Bag size | Exact calculation | Whole bags to buy |
|---|---|---|
| 0.75 cu ft | 27 ÷ 0.75 = 36 | 36 bags |
| 1 cu ft | 27 ÷ 1 = 27 | 27 bags |
| 1.5 cu ft | 27 ÷ 1.5 = 18 | 18 bags |
| 2 cu ft | 27 ÷ 2 = 13.5 | 14 bags |
| 3 cu ft | 27 ÷ 3 = 9 | 9 bags |
The 2-cubic-foot example shows why the buying number can be different from the mathematical result. A store cannot sell half of a sealed bag, so 13.5 becomes 14 bags. Always use the volume shown on the product label; bag sizes vary by brand and by material.
Cubic feet and cubic yards: the basic conversions
Cubic feet → cubic yards: divide by 27.
Cubic yards → cubic feet: multiply by 27.
Cubic feet → bags: divide by the bag size, then round up.
A cubic yard is a volume measuring 3 feet long × 3 feet wide × 3 feet high. Multiplying those dimensions gives 27 cubic feet. This relationship does not change with the type of soil.
Common volume-to-bag examples
| Soil needed | 1.5 cu ft bags | 2 cu ft bags | Bulk equivalent |
|---|---|---|---|
| 9 cu ft | 6 bags | 5 bags | 0.33 cu yd |
| 18 cu ft | 12 bags | 9 bags | 0.67 cu yd |
| 27 cu ft | 18 bags | 14 bags | 1.00 cu yd |
| 40.5 cu ft | 27 bags | 21 bags | 1.50 cu yd |
| 54 cu ft | 36 bags | 27 bags | 2.00 cu yd |
Each bag count is rounded upward when necessary. The bulk equivalent is useful for requesting a quote, but suppliers may have minimum delivery quantities or sell in half-yard increments.
Calculate soil volume before converting it
For a rectangular raised bed, multiply the inside length × inside width × soil depth. Convert an inch measurement to feet before multiplying: 6 inches is 0.5 foot, 9 inches is 0.75 foot and 12 inches is 1 foot.
Example: A bed that is 8 feet long, 4 feet wide and 12 inches deep needs 8 × 4 × 1 = 32 cubic feet. That is 1.19 cubic yards, 22 bags at 1.5 cubic feet, or 16 bags at 2 cubic feet.
Measure the usable interior, not the outside of the boards. For circular beds, use the cylinder formula or let the calculator handle the diameter and unit conversion.
Add an allowance for settling
Fresh soil can settle after watering and planting. A modest 5–10% allowance is useful when measurements are approximate or the mix is loose. Multiply the calculated volume by 1.05 for 5% extra or by 1.10 for 10% extra, then calculate bags from that adjusted amount.
Do not automatically add extra just because a frame has a stated height. If you intend to leave one or two inches below the rim for mulch and watering, calculate using the actual fill depth.
Bags or bulk delivery?
Bagged soil may be easier when:
- the project is small or must be completed in stages;
- you have no clean place for a bulk pile;
- the bed is difficult to reach with a wheelbarrow; or
- you need a specific packaged mix.
Bulk soil may be worth pricing when:
- you are filling several beds or need roughly a cubic yard or more;
- a supplier can deliver close to the work area; and
- you can inspect the mix and compare the delivered total—not only the price per yard.
Compare product type, delivery fee and final quantity. One cubic yard of topsoil does not necessarily weigh the same as one cubic yard of compost or a lightweight raised-bed mix. Moisture also changes weight, so confirm loading and vehicle limits with the supplier.
Avoid these buying mistakes
- Mixing inches and feet: convert depth before multiplying.
- Using outside dimensions: thick boards reduce the usable interior volume.
- Rounding too early: calculate the complete volume first, then round only the final bag count.
- Assuming every bag is the same size: read the cubic-foot volume, not only the package name.
- Comparing price without delivery: include delivery, tax and any minimum order in a bulk quote.
Skip the manual conversion
Enter your bed measurements and bag size to get whole bags, cubic yards, liters and estimated cost.
Frequently asked questions
How many bags of soil are in one cubic yard?
One cubic yard equals 27 cubic feet. That is 36 bags at 0.75 cubic foot, 27 one-cubic-foot bags, 18 bags at 1.5 cubic feet, 14 two-cubic-foot bags after rounding up, or 9 three-cubic-foot bags.
How do I convert cubic feet of soil to cubic yards?
Divide cubic feet by 27. For example, 54 cubic feet divided by 27 equals 2 cubic yards.
Should I round soil bags up or down?
Round up to the next whole bag. Soil is sold in whole bags, and a small surplus helps cover minor measurement differences and settling.
Does a cubic yard of every soil product weigh the same?
No. Weight changes with the material, particle size and moisture level. Use the supplier's current weight and delivery limits rather than a single universal estimate.