Updated July 18, 2026
How it works
Multiply length by width to get area in square feet, then multiply by depth converted to feet (depth in inches divided by 12). Divide by 27 to convert cubic feet to cubic yards. A standard 40 lb bag covers about 0.75 cubic feet, so the bag count is cubic feet divided by 0.75, rounded up.
Weight and coverage figures above track Topsoil.com's density data and University of Minnesota Extension guidance, both cited below.
What a yard of topsoil actually covers
One cubic yard covers about 162 square feet at 2 inches deep. Spread it thinner and it reaches further; pile it deeper and it covers less. Because soil is sold by the yard, the quickest way to estimate is to pick your depth, read the coverage from the table below, and divide your area by that number.
Coverage per cubic yard
| Depth | Coverage per yard | Typical use |
|---|---|---|
| 1″ | about 324 ft² | top dressing a lawn |
| 2″ | about 162 ft² | leveling, light grading |
| 3″ | about 108 ft² | new beds, overseeding base |
Worked example
Say you are topping a 1,000 square foot lawn area at 2 inches. Convert depth to feet: 2 ÷ 12 = 0.167 ft. Then:
- Cubic feet: 1,000 × 0.167 = about 167 ft³
- Cubic yards: 167 ÷ 27 = about 6.2 yd³
So you would order about 6 to 7 yards bulk, or roughly 222 forty-pound bags if you went bagged, which is why bulk wins for anything this size. At a typical $30 per yard the bulk soil runs about $186 plus delivery. Add 10 to 15 percent if the ground is uneven, since low spots swallow more soil than you expect.
How to measure and apply
For a rectangle, length times width gives the area. Break odd shapes into rectangles and add them up. When you spread topsoil, mix the new soil a few inches into the existing ground rather than laying a clean layer on top; a hard boundary between old and new soil blocks roots and traps water. For lawns, 2 to 4 inches is plenty. For new garden beds, 6 to 8 inches gives roots room to establish.
Common mistakes
- Buying bagged for a big job. A yard is about 36 bags, so large areas get expensive fast at retail bag prices.
- Ignoring settling. Fresh topsoil compacts, so spread a touch high and let it settle in.
- Skipping the moisture math. Dry topsoil weighs about 2,000 lb per yard; saturated soil can hit 3,000 lb, so wet loads cost more to haul and cover less ground.
- Laying a sealed layer. Blend into the subsoil so roots and drainage carry through.
Sources: Topsoil.com weight data, UMN Extension.