Your Result Explained: What These Numbers Mean
Ordering topsoil requires tracking both volume (cubic yards) and weight (tons) because screened mineral soil is nearly four times heavier than bark mulch. A single cubic yard of dry-to-moist screened loam topsoil occupies 27 cubic feet and weighs roughly 2,000 to 2,400 pounds (1.0 to 1.2 US short tons). When rain-soaked or clay-heavy, that same cubic yard can exceed 2,600 pounds.
Use the Cubic Yards figure when ordering from a landscape supply yard or topsoil screener. Because loose dumped soil compacts and settles by 10% to 15% once watered and rolled with a lawn roller, always include at least a 10% waste/settling factor when filling low spots or grading a new lawn seedbed. If buying retail bags for small lawn patches, note that standard topsoil bags are 0.75 cubic feet (40 lbs)—meaning it takes 36 bags to equal just one bulk cubic yard.
Worked Example: Adding 2 Inches of Screened Topsoil to a 25 ft × 20 ft Lawn Area
You are renovating a 500-square-foot backyard lawn section (25 ft × 20 ft) and want to till in 2 inches of screened loam topsoil with a 10% allowance for settling after rolling.
- Calculate area: 25 ft × 20 ft = 500 square feet.
- Convert 2-inch depth to feet: 2 in ÷ 12 = 0.1667 feet.
- Compute net loose volume: 500 sq ft × 0.1667 ft = 83.33 cubic feet.
- Add 10% settling allowance: 83.33 cu ft × 1.10 = 91.67 cubic feet.
- Convert to bulk cubic yards: 91.67 cu ft ÷ 27 = 3.40 cubic yards.
- Estimate weight (at 2,200 lbs/yd³): 3.40 yd³ × 2,200 lbs = 7,480 lbs (3.74 tons).
- Equivalent 0.75 cu ft retail bags: 91.67 ÷ 0.75 = 123 bags.
Result Summary: Order 3.5 cubic yards of bulk screened topsoil (approx. 3.85 tons) for dump delivery rather than hauling 123 individual 40-lb bags.
How This Is Calculated (Formulas & Measurement Guide)
We multiply the surface area in square feet by the desired soil depth in feet to get net cubic feet, apply your selected settling/waste percentage, and divide by 27 to get cubic yards.
Cubic Yards = [Area (sq ft) × (Depth in inches ÷ 12) × (1 + Waste%)] ÷ 27 Converts square footage and inch depth into cubic yards while compensating for 10%–15% soil consolidation after watering.
Tons = (Cubic Yards × Bulk Density in lbs/yd³) ÷ 2,000 Screened loam topsoil defaults to 2,200 lbs/yd³ (1.1 tons/yd³), while finished organic compost defaults to 1,100 lbs/yd³ (0.55 tons/yd³).
How to Measure Irregular Areas & Curved Borders
When leveling uneven yard depressions ("birdbaths"), stretch a mason string tightly across the low spot between two stakes flush with the surrounding lawn grade. Measure the depth from the string to the soil at several points inside the depression and enter the average depth—not the single deepest center point.
Practical Tips & Common Mistakes to Avoid
Field-Tested Planning Tips
Always Ask for "Pulverized" or "Screened" Topsoil (1/2-Inch Mesh)
Unscreened "fill dirt" or raw excavation soil contains clay clods, stones, and weed rhizomes that make raking a smooth lawn seedbed impossible. Specify mechanically screened topsoil (passed through a 3/8" or 1/2" trommel screen) for lawn grading and topdressing.
Blend New Topsoil into Existing Subsoil to Prevent a Perched Water Table
Dumping 3 inches of sandy loam directly on top of compacted native clay creates a sharp texture interface that impedes water drainage and root penetration. Core-aerate or lightly rototill the first inch of new topsoil into the existing soil before spreading the final layer.
Account for 15% Compaction When Filling Deep Trenches
Loose soil fluffed by a loader bucket contains extra air pore space. When filling utility trenches or sunken drainage lines deeper than 4 inches, tamp the soil in 3-inch lifts and add 15% overage so the trench does not sink into a trough next spring.
Keep Lawn Topdressing Under 1/2 Inch Over Existing Grass
When leveling a bumpy established lawn without killing the existing grass blades, apply only 1/4 inch to 1/2 inch of screened topsoil or compost/sand mix per pass and work it down into the canopy with a leveling lute.
Common Ordering & Installation Mistakes
Mistake Ordering pure topsoil to fill deep enclosed planter boxes
Recommended Fix: 100% mineral topsoil compacts into a dense brick inside raised beds and pots. Use a 50/50 topsoil-compost blend for ground-contact beds or a lightweight soilless raised bed mix for containers.
Mistake Spreading wet topsoil during rainy weather
Recommended Fix: Working or rolling saturated clay-loam topsoil destroys soil crumb structure (aggregates) and creates a hardpan crust. Wait until a squeezed handful of soil crumbles easily when poked.
Mistake Underestimating how small a 0.75 cu ft topsoil bag is
Recommended Fix: Retail topsoil bags look similar in size to mulch bags, but because dirt is heavy, they hold only 0.75 or 1.0 cubic feet (40 lbs) instead of 2.0 cubic feet. Check the cubic foot volume printed on the front before buying.
Topsoil Calculator Coverage & Depth Reference Table
Standard coverage rates for Screened Loam Topsoil (Dry to Field Moist) (typical bulk density 2200 lbs/yd³, range 2000–2400 lbs/yd³).
| Application Depth | 1 Cubic Yard Covers | 1 Ton Covers | Yards per 100 sq ft | Tons per 100 sq ft | Bags (0.75 ft³) / 100 sq ft |
|---|---|---|---|---|---|
| 0.25 in | 1296 sq ft | 1178.2 sq ft | 0.08 yd³ | 0.09 tons | 3 bags |
| 0.5 in | 648 sq ft | 589.1 sq ft | 0.15 yd³ | 0.17 tons | 6 bags |
| 1 in | 324 sq ft | 294.5 sq ft | 0.31 yd³ | 0.34 tons | 12 bags |
| 2 in Std | 162 sq ft | 147.3 sq ft | 0.62 yd³ | 0.68 tons | 23 bags |
| 4 in | 81 sq ft | 73.6 sq ft | 1.23 yd³ | 1.35 tons | 45 bags |
| 6 in | 54 sq ft | 49.1 sq ft | 1.85 yd³ | 2.04 tons | 67 bags |
Reference Source: USDA NRCS Soil Quality Indicators (Bulk Density) & University of Minnesota Extension. Loose screened topsoil averages ~1.1 tons/yd³; add 10–15% volume for settling after watering.
Frequently Asked Questions (Topsoil Calculator)
How much does 1 cubic yard of topsoil weigh?
One cubic yard of dry-to-moist screened loam topsoil weighs between 2,000 and 2,400 pounds, or roughly 1.0 to 1.2 US short tons (average 2,200 lbs / 1.1 tons). Wet or clay-heavy topsoil weighs 2,500 to 2,700 pounds (1.25 to 1.35 tons) per cubic yard.
How many square feet will 1 cubic yard of topsoil cover?
One cubic yard (27 cu ft) of topsoil covers 324 sq ft at 1 inch deep, 162 sq ft at 2 inches deep, 108 sq ft at 3 inches deep, 81 sq ft at 4 inches deep, and 54 sq ft at 6 inches deep.
How many 40 lb bags of topsoil equal 1 cubic yard?
Standard 40-pound topsoil bags contain 0.75 cubic feet of soil. Since 1 cubic yard is 27 cubic feet, it takes 36 bags (27 ÷ 0.75 = 36) to equal 1 cubic yard.
How deep should topsoil be for seeding a new lawn?
Turfgrass roots thrive best with 4 to 6 inches of quality topsoil. If your existing yard soil is decent but compacted, core-aerating and adding 1 to 2 inches of screened topsoil or compost before seeding is usually sufficient.
What is the difference between topsoil, garden soil, and fill dirt?
Fill dirt is subsoil with zero organic matter used strictly for structural elevation beneath slabs or deep holes. Screened topsoil is the upper mineral soil horizon used for grading lawns. Garden soil is topsoil pre-blended with compost or aged bark for planting flowers and vegetables.
Can a half-ton pickup truck carry 1 cubic yard of topsoil?
Even though 1 cubic yard fits easily by volume inside a standard pickup bed, 2,200 to 2,500 pounds exceeds the 1,500–1,900 lb payload rating of most half-ton trucks. Either split 1 yard into two half-yard loads or use a 3/4-ton truck or dump trailer.
Worked Example Project Scenarios (Topsoil Calculator)
Explore pre-computed material takeoffs for popular residential project dimensions: