Measure the project area
Enter the length and width of the lawn, garden bed, or landscaping area. If you already know the total square footage, switch to Known area instead.
Landscaping & garden
Topsoil Calculator
Calculate how much topsoil you need for lawns, garden beds, and landscaping projects. Get cubic yards, cubic feet, cubic meters, bags, weight, and optional cost estimates.
How it works
How to calculate how much topsoil you need
Topsoil quantity depends on the surface area you want to cover and the depth of the new soil layer. This calculator converts those measurements into cubic feet, cubic yards, cubic meters, whole bags, and optional weight and cost estimates.
Choose the topsoil depth
Enter the thickness of the topsoil layer in inches. Even a small change in depth can significantly change the amount of soil required.
Add extra only if needed
You can include an optional allowance for uneven ground, settling, grading adjustments, or measurement uncertainty.
Plan how you will buy it
Use the cubic-yard result for bulk soil, or enter a bag volume to calculate how many complete bags you need to purchase.
Topsoil calculation formula
For a rectangular area, start by calculating the surface area:
Area = length × width
Because the calculator accepts depth in inches, convert the depth to feet:
Depth in feet = depth in inches ÷ 12
Then calculate the volume in cubic feet:
Cubic feet = area × depth in feet
Bulk topsoil is commonly measured in cubic yards. There are 27 cubic feet in one cubic yard:
Cubic yards = cubic feet ÷ 27
Worked example: how much topsoil for 200 square feet?
Suppose an area is 20 ft long and10 ft wide, giving a total area of200 ft².
At a 3-inch depth, the base topsoil volume is 50 ft³, which is about1.85 yd³.
If you choose a 10% extra allowance, the total becomes 55 ft³, or about2.04 yd³.
If the topsoil is sold in 2 ft³ bags, you would need 28 complete bags. Those bags contain 56 ft³ in total, leaving about 1 ft³ beyond the calculated requirement because bag quantities must be rounded up.
How deep should topsoil be?
The right depth depends on the project and the soil already in place. The values below are useful starting points, not universal requirements.
¼–½ in
Lawn topdressing
Thin applications can be used to lightly topdress an established lawn without burying the existing grass.
1–3 in
Lawn repair & leveling
More soil may be needed when correcting low spots, repairing areas, or preparing a surface for seeding.
3–6 in
Garden & landscape beds
Several inches of new soil may be appropriate when refreshing or creating planting areas, depending on the existing soil underneath.
4–6 in
Preparing for sod
New lawn preparation may use a deeper layer where the existing soil needs improvement. Follow the requirements for your site and sod.
Raised beds often use a blended growing medium rather than topsoil alone. If you are filling a raised bed, calculate the full bed volume and follow the soil-mix recommendation appropriate for what you plan to grow.
Should you add extra topsoil?
Not automatically. A 0% allowance is valid when your measurements closely represent the finished project. Extra material can be useful when site conditions make the final volume less predictable.
0%
Use the calculated quantity directly when the area and depth are well defined.
5–10%
May be useful for minor grading differences, uneven ground, settling, or measurement uncertainty.
Custom
Enter your own allowance when the project, contractor, or supplier gives you a specific amount to add.
Bagged topsoil vs. bulk topsoil
Bagged topsoil is convenient for smaller jobs and is normally labeled by volume, such as 0.75 ft³, 1 ft³, or another package size. Enter the exact volume printed on the bag you plan to buy.
The calculator divides the required soil volume by the bag size and rounds upward because bags are purchased as complete units. It also shows the total purchased bag volume and the extra volume created by rounding.
For larger projects, suppliers commonly sell bulk topsoil by the cubic yard. Use the cubic-yard result when requesting a quote, and confirm minimum orders, delivery fees, and the supplier's ordering increments before purchasing.
How is topsoil weight estimated?
Topsoil does not have one universal weight. Moisture, soil composition, organic matter, and compaction can all change its density.
For that reason, HomeMeasureWorks does not assume a single default soil density. If your supplier provides a density in pounds per cubic foot, enter that value into the calculator for a project-specific weight estimate.
Estimated weight = soil volume × soil density
Frequently asked questions
How many cubic feet are in a cubic yard of topsoil?
One cubic yard contains 27 cubic feet.
How do I calculate how much topsoil I need?
Multiply the project area by the desired soil depth after converting the depth to feet. The result is the required volume in cubic feet. Divide by 27 to convert cubic feet to cubic yards.
Can I enter square footage instead of length and width?
Yes. Choose Known area and enter the total square footage directly. If you do not know the area yet, use the Square Footage Calculator first.
Why are topsoil bags rounded up?
Bagged soil is normally purchased in complete bags, so any fractional bag requirement is rounded up to the next whole bag.
Should I always add extra topsoil?
No. Leave the allowance at 0% when you want the quantity calculated directly from your measurements. Add extra only when your project conditions justify it.
How much does a cubic yard of topsoil weigh?
There is no single reliable weight for every topsoil product because density changes with moisture, composition, and compaction. Use your supplier's density when available.
Is it better to buy topsoil in bags or in bulk?
Bags can be convenient for small projects. Bulk delivery is often more practical for projects requiring several cubic yards. Compare local pricing, delivery requirements, and the amount you need.
Can I use the calculator for an irregular area?
Yes. Break the project into simpler sections, find their combined square footage, and enter that value using Known area.
Related calculators
Need to find your project area first? Use the Square Footage Calculator. For other landscaping materials, try the Mulch Calculator or Gravel Calculator. You can also browse all HomeMeasureWorks calculators.
Important assumptions
This calculator estimates material quantities from the measurements and optional values you enter. Actual topsoil requirements can vary because of uneven ground, settlement, compaction, grading, product differences, moisture, and measurement accuracy.
Bag counts are rounded up to complete bags. Weight is calculated only when you provide a soil density. Bulk cost is based on the calculated cubic-yard volume and may differ from a supplier's minimum order, delivery charge, or sales increment. Confirm product sizes, prices, and project requirements before purchasing.