What this Soil Calculator does

This soil calculator estimates how much soil you need for a garden, raised bed, planter, or landscaping project. It can help you plan purchases in cubic yards, cubic feet, bag count, or other common soil units.

Many projects need soil, topsoil, compost, or dirt to fill a specific depth.

Why it is useful

Soil settles over time, and project areas are often irregular. A calculator helps users estimate the right quantity with less guesswork and waste.

How to calculate soil

Measure the area you want to fill and decide on the depth. Multiply area by depth to get volume, then convert the result into the units you need. If you are buying bagged soil, divide by the bag size to get bag count.

Step 1: Measure the area

Enter the length and width for rectangular beds, or the radius/diameter for round areas.

Step 2: Choose the depth

Set the soil depth in inches, feet, or another supported unit.

Step 3: Read the result

The calculator returns the amount of soil required and may also estimate bags or bulk loads.

Formula

Volume: Area × Depth

Rectangular bed: Length × Width × Depth

Bag count: Total volume ÷ bag size

Example calculation

Example: A 10 ft by 4 ft bed at 2 ft depth.

Volume = 10 × 4 × 2 = 80 cubic feet.

In cubic yards: 80 ÷ 27 = 2.96 cu yd.

Example: If soil is sold in 2 cu ft bags.

80 ÷ 2 = 40 bags.

Common uses of Soil Calculator

Raised beds and planter boxes.
Topsoil for landscaping.
Compost and dirt estimates.
Bag count and bulk delivery planning.

Important tips

For garden projects, it is often smart to add a little extra soil because soil settles after watering and compaction. Irregular beds are usually easier to estimate by splitting them into smaller rectangles.

Frequently asked questions

How much soil do I need for a raised bed?

Measure the bed’s length, width, and depth, then multiply them to get the soil volume.

Can I calculate soil in bags?

Yes. Divide the total soil volume by the bag size to estimate how many bags to buy.

How deep should soil be in a garden bed?

Depth depends on the plant and bed type, but many raised beds use around 2 to 4 feet of fill depth in large beds or several inches for top layers.

Does soil settle over time?

Yes. Soil often settles, so adding a small extra amount is a good idea.

Can this calculator handle circular beds?

Yes. A good soil calculator can work with circular areas as well as rectangular ones.