Topsoil & Garden Soil Calculator

Estimate soil volume for lawns, garden beds, and landscaping. Get results in cubic feet, cubic yards, cubic meters, estimated tons, retail bags, bulk cost, bagged cost, and a 10% waste-buffer recommendation.

Area Dimensions

Choose your area shape and enter measurements.

Length (ft)

Width (ft)

Depth (in)

Suggested: 2-4 for grass, 6-12 for beds

What-If Depth Adjuster

Visualize the impact of depth variations on material requirements.

Adjust Depth 0 Inches

A single inch of soil can significantly impact your total order. Use this simulator to see how adjusting your coverage depth changes the cubic yards required.

Base Tonnage

2.84

Simulated Total

2.84

0.00

Projected Variance

Difference in required cubic yards.

How Much Topsoil Do I Need?

Planning a landscaping or gardening project requires accurate material estimations. Whether you are preparing a topsoil layer for a new lawn, refreshing soil for garden beds, building raised garden beds, or calculating compost additions, ordering the correct volume prevents costly over-ordering or project delays. It is recommended to perform soil testing before adding topsoil or compost.

Our Topsoil & Garden Soil Calculator does the math for you. By inputting your dimensions (whether rectangular, circular, or triangular), depth, settling factor, and bag retail size, you can instantly estimate the total cubic yards, cubic feet, cubic meters, short tons, and retail bags needed, alongside bulk and bagged cost comparisons.

Topsoil Calculation Formula

To calculate topsoil volume manually, find the surface area of your space and multiply it by your desired depth (converted to feet).

Step 1: Core Conversions

Area (sq ft) = L (ft) × W (ft)

Depth (ft) = Depth (in) ÷ 12

Volume (cu ft) = Area × Depth

Step 2: Add Compaction & Convert

Adjusted Vol = Volume × (1 + Compaction%)

Yards = Adjusted Vol (cu ft) ÷ 27

Why account for compaction?

When bulk dirt is dumped, spread, and watered down, air pockets collapse, causing it to settle.

Compaction Rates

As a planning estimate, this calculator uses a 15% settling factor for topsoil. Actual compaction varies by moisture level, soil texture, and how the material is installed, which you can verify using USDA Web Soil Survey soil data.

Weight Estimation

Multiply Volume (cu yd) × Material Density (tons/yd³) to estimate the final weight in tons.

Recommended Soil Depths by Project

Quick depth guidance based on plant type and drainage needs.

Project Type	Suggested Depth	Typical Purpose
Topdressing lawn	¼ – ½ inch	Overseeding, grass nutrients, filling minor dips
New lawn or grass seed	4 – 6 inches	Base root zone for healthy sod or grass seed
Garden bed refresh	2 – 4 inches	Top layer composting, weed block, soil health
New garden bed	6 – 12 inches	Deep tilling root base for flowers and shrubs
Raised bed	8 – 12+ inches	Vegetables, root crops, herbs container depth
Leveling low spots	1 – 3 inches	Filling structural yard slopes and depressions

Tip: Consult local raised bed soil depth guidance for specialized crops and root vegetables.

Bulk Topsoil vs. Bagged Soil

Deciding whether to purchase topsoil by the truckload (bulk cubic yards) or in plastic retail bags depends on the scale of your landscape:

Bulk Delivery (Cubic Yards)

Recommended for volumes greater than 1.5 cubic yards. Delivering bulk soil in a dump truck is highly cost-effective per unit volume, but requires space (like a driveway) to dump the soil and effort to move it with a wheelbarrow.

Bagged Soil (Retail Bags)

Recommended for small planters, containers, or hard-to-reach areas. Standard sizes are 0.75 cu ft or 1.0 cu ft. Bagged soil is clean, pre-mixed, and easy to carry, but ordering bulk quantities in bags will incur significantly higher costs.

Soil, Compost & Garden Mix Differences

Not all soils weigh or act the same. Selecting the right product depends on your gardening goals. Note that these are useful planning defaults, but actual weight and settling vary depending on moisture, screening, organic content, and supplier mix:

Topsoil: Heavy, dense mineral soil (approx. 1.2 tons per cubic yard) primarily used as structural fill for leveling yards, lawns, and establishing general turf height.
Compost: Pure decomposed organic matter (approx. 0.6 tons per cubic yard) used to feed the soil biology. It improves drainage, moisture retention, and soil nutrients. Learn more about the benefits of using compost.
Garden Mix: A blended ready-to-plant soil mix (approx. 1.0 ton per cubic yard) containing topsoil, compost, and sand. It provides the ideal balance of structure and nutrients for raised beds.

Example Walkthrough Calculation

Suppose you want to fill a raised bed measuring 20 ft long by 10 ft wide with a depth of 4 inches of topsoil:

Calculate Area200 sq ft

Adjusted Volume (15% Compaction)76.67 cu ft

Total Cubic Yards2.84 Yards

Additional Metrics

Estimated Weight3.41 Tons

Retail Bags (1.0 cu ft)77 Bags

Topsoil FAQ

Essential answers for estimating soil volume and preparing your landscape.

How do I calculate how much topsoil I need?

Multiply your project area (length in feet × width in feet) by the desired depth in feet (depth in inches divided by 12) to get the cubic feet. Divide this result by 27 to find the required volume in cubic yards.

How many cubic feet are in a cubic yard of soil?

There are exactly 27 cubic feet in one cubic yard of soil.

How deep should topsoil be for grass?

For a new lawn or sowing grass seed, a depth of 4 to 6 inches of topsoil is recommended. For lawn topdressing, a thin layer of 1/4 to 1/2 inch is ideal.

How deep should soil be for a garden bed?

New garden beds typically require 6 to 12 inches of soil. Raised beds need 8 to 12 inches or more, whereas a simple garden bed refresh needs 2 to 4 inches of compost or soil mix.

Should I buy topsoil by the bag or by the cubic yard?

If your project requires more than 1 to 2 cubic yards of soil, buying in bulk by the cubic yard is generally much more cost-effective. For small pots, planters, or raised beds under 1 cubic yard, buying bagged soil is cleaner and easier to manage.

How much extra soil should I order for settling?

Soil naturally compacts and settles after watering and walking on it. We recommend adding a compaction or settling factor of 15% to 20% to your raw volume to ensure you do not run short.

What is the difference between topsoil, compost, and garden mix?

Topsoil is native screened dirt used for filling and leveling. Compost is decomposed nutrient-rich organic matter used to enrich existing soil. Garden mix is a ready-to-use blend of topsoil, compost, and sand designed for vegetable and flower beds.

How many bags of soil equal one cubic yard?

It depends on the bag size. One cubic yard is 27 cubic feet. Therefore, it takes 36 bags of 0.75 cubic feet size, 27 bags of 1.0 cubic foot size, 18 bags of 1.5 cubic feet size, or 13.5 bags of 2.0 cubic feet size to equal one cubic yard.