1. Measure the Garden
Measure the length and width of a rectangular garden, or the diameter of a circular bed. Use the unit selectors if your measurements use different units.
Free Garden Planning Tool
Garden Soil Calculator
Estimate how much soil you need for rectangular beds, raised gardens, circular planters, and multiple garden sections. Get results in cubic feet, cubic yards, cubic meters, soil bags, and estimated project cost.
Calculate Soil Requirements
Enter your garden dimensions and soil purchase details.
Simple three-step process
How the Garden Soil Calculator Works
The calculator converts all measurements into a common unit, calculates surface area, multiplies it by soil depth, and then converts the result into useful purchasing quantities.
2. Choose Soil Depth
Enter the desired soil depth. A light top-dressing may need 1 to 3 inches, while new raised beds may need 8 to 18 inches.
3. Review Purchase Amounts
View cubic feet, cubic yards, cubic meters, full bag quantities, estimated bag cost, and estimated bulk soil cost.
How Much Garden Soil Do You Need?
The amount of garden soil required depends on the surface area of your planting bed and the depth of soil you want to add. Rectangular gardens use length multiplied by width, while circular gardens use the radius of the bed.
After calculating surface area, the calculator multiplies it by the soil depth. The resulting volume is converted into cubic feet, cubic yards, cubic meters, liters, and bags.
- Use 1 to 3 inches for refreshing existing garden soil.
- Use 6 to 12 inches for many vegetable and flower beds.
- Use 12 to 18 inches for deep raised beds and root vegetables.
- Include a 10% allowance for settling and compaction.
Useful planning information
Garden Soil Depth Guide
Use these general soil depth recommendations as a starting point. Plant requirements and existing ground conditions may vary.
1 to 3 Inches
Suitable for top-dressing an existing garden, improving lawn soil, or adding a thin compost layer.
6 to 12 Inches
Common for vegetable gardens, flower beds, herbs, annuals, and general raised garden beds.
12 to 18 Inches
Useful for deeper raised beds, larger plants, root crops, and gardens built over poor native soil.
Common questions
Garden Soil Calculator FAQs
Helpful answers about soil volume, bag quantities, measurement, compaction, and raised garden beds.
Multiply the garden length by its width to find the surface
area. Convert the soil depth into the same measurement system,
then multiply the area by the depth. The result is the total
soil volume.
One cubic yard contains 27 cubic feet. Divide cubic feet by
27 to calculate the equivalent number of cubic yards.
Yes. Adding approximately 10% extra is useful because loose
soil can settle and compact after watering, planting, and
normal weather exposure.
Bags are convenient for small projects, but bulk soil is
normally more economical for large raised beds and landscaping
projects. Delivery fees should also be included when comparing prices.
Many raised beds use 8 to 12 inches of growing soil. Deep-rooted
vegetables and beds built over concrete or poor ground may benefit
from 12 to 18 inches or more.
Yes. Enter the dimensions of one garden bed and specify the
total number of identical beds. The calculator multiplies the
soil requirement by that quantity.
Enter the volume printed on the soil bag. Common bag sizes
include 1 cubic foot, 1.5 cubic feet, 2 cubic feet, 25 liters,
40 liters, and 50 liters.