Topsoil guide
How Much Topsoil Do I Need?
The amount of topsoil you need depends on the length, width, and depth of the area you want to cover. Topsoil is usually measured in cubic yards or cubic meters.
Multiply length by width by depth to find volume. If using inches for depth, convert the depth to feet first. Then divide cubic feet by 27 to get cubic yards.
Use the Topsoil Calculator →Topsoil Formula
Depth must be in feet before using this formula. For example, 6 inches is 0.5 feet.
Common Topsoil Estimates
| Area Size | Depth | Topsoil Needed |
|---|---|---|
| 10 × 10 ft | 4 in | 1.23 yd³ |
| 20 × 10 ft | 6 in | 3.70 yd³ |
| 20 × 20 ft | 4 in | 4.94 yd³ |
| 30 × 20 ft | 6 in | 11.11 yd³ |
Example
A 20 ft by 10 ft area at 6 inches deep is 100 cubic feet. Dividing by 27 gives about 3.70 cubic yards. With 10% extra, you should plan for about 4.07 cubic yards.
Should You Add Extra Topsoil?
Yes. Topsoil can settle after spreading, watering, and compaction. A 5–10% waste allowance helps account for settling, uneven ground, and spreading variation.