Enter the area and desired depth of soil into the calculator to determine the number of bags of soil needed.

Bags Of Soil Formula

The following formula is used to calculate the number of bags of soil needed for a garden.

BS = (A * D/12) / S

Variables:

  • BS is the number of bags of soil needed
  • A is the area of the garden in square feet
  • D is the desired depth of soil in inches
  • S is the size of the soil bag in cubic feet

To calculate the number of bags of soil needed, multiply the area of the garden by the desired depth of soil. Then divide the result by the size of the soil bag. This will give you the number of bags of soil needed for your garden.

What is a bag of Soil?

A bag of soil, also known as a bag of dirt, is a commercially packaged product containing soil or a soil-like substance used for gardening or farming purposes. The soil in these bags is often enriched with nutrients and other organic matter to promote plant growth. They come in various types such as topsoil, potting soil, garden soil, and more, each designed for specific plants or growing conditions.

How to Calculate Bags Of Soil?

The following steps outline how to calculate the number of bags of soil needed.


  1. First, determine the area of the garden in square feet (A).
  2. Next, determine the desired depth of soil in inches (D).
  3. Next, determine the size of the soil bag in cubic feet (S).
  4. Next, gather the formula from above = BS = (A * D) / S.
  5. Finally, calculate the number of bags of soil needed (BS).
  6. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Area of the garden (A) = 200 square feet

Desired depth of soil (D) = 6 inches

Size of the soil bag (S) = 2 cubic feet