Topsoil Calculator
Calculate topsoil volume in cubic yards, retail bags, and square feet coverage. Master agronomic application depths for lawn renovation, sod preparation, overseeding, and raised garden planter mixes.
Topsoil Coverage Calculator
Calculate cubic yards, tons, and bags for topdressing, seeding, or planter beds
Screened soil settles 5%–10% after initial watering
Coverage: 250 sq ft @ 3" depth (2.67 tons weight)
How to Calculate Topsoil: Square Feet to Cubic Yards
Estimating topsoil requires measuring your total project square footage and dividing by the mathematical coverage constant of a cubic yard. One cubic yard contains 27 cubic feet, which equals exactly 324 square feet at a 1-inch thickness (27 × 12 = 324):
Worked Contractor Example: 2,400 Sq Ft Lawn Renovation at 3" Depth
Suppose a landscaping contractor is preparing a 2,400 square foot residential yard for hydroseeding, requiring a 3-inch layer of screened loam:
- Calculate net geometric volume: (2,400 sq ft × 3 in) ÷ 324 = 22.22 cu yds
- Add 12% fluff and settling factor: 22.22 × 1.12 = 24.89 cu yds
- Convert to certified scale weight (2,100 lb/yd³): 24.89 yds × 1.05 tons/yd = 26.13 Tons
- Delivery sizing: 24.89 yds ÷ 12 yds/truck = 2 Tandem dump truckloads
- Packaged bag equivalent (if purchasing 1.0 cu ft retail bags): 24.89 yds × 27 bags/yd = 672 bags
Recommended Topsoil Depths by Project Application
Applying incorrect soil depth can lead to root suffocating or summer drought desiccation. Match your project depth to agronomic turfgrass standards:
1 cu yd covers 648 to 1,296 sq ft. Spread across existing lawns after pulling aerator cores. Enriches the root zone with microbes without suffocating grass leaves.
1 cu yd covers 162 to 324 sq ft. Eliminates scalping high spots, smooths bumpy mower ruts, and provides an ideal seed-to-soil bed for newly broadcasted fescue or bluegrass.
1 cu yd covers 54 to 81 sq ft. Creates deep root reservoirs. Shallow soil (under 3 inches) results in rapid turf burnout and sod shrinkage during summer heat.
1 cu yd covers 27 to 40 sq ft. Provides unrestricted taproot depth for heavy-feeding vegetables (tomatoes, carrots, peppers). Requires an aerated 60/30/10 blend.
Screened Topsoil Grades & Trommel Sizing
Not all bulk topsoil is created equal. Commercial landscape yards pass raw field soil through rotating mechanical trommel screens to separate usable loam from debris:
Removes rocks, sticks, and clay clods larger than 0.5 inches. The most common and economical grade for broad lawn leveling, tree planting, and filling subgrade grading trenches.
Sifted through tighter wire mesh. Extremely smooth texture that rakes effortlessly with landscape lutes. Ideal for sod underlayment, seed broadcasting, and residential flower beds.
Composed of 60% finely screened sandy loam, 30% aged organic compost, and 10% coarse sand. Prevents soil compaction in raised containers, promoting exceptional water drainage and root oxygenation.
Bagged Topsoil vs. Bulk Dump Truck Delivery: Cost Analysis
Pre-bagged topsoil sold at home centers is convenient for small pot planting, but purchasing bags for lawn projects is financially inefficient:
| Project Volume | 1.0 cu ft Bags Needed | Bagged Cost (@ $3.50/bag) | Bulk Nursery Cost + Delivery | Best Buying Option |
|---|---|---|---|---|
| 0.5 cu yd (13.5 cu ft) | 14 bags | $49.00 | $95.00 (min drop fee) | Retail Bags (Car Trunk) |
| 1.0 cu yd (27 cu ft) | 27 bags | $94.50 | $105.00 | Break-Even / Pickup Bed |
| 3.0 cu yds (81 cu ft) | 81 bags | $283.50 | $175.00 | Bulk Delivery (Save $108) |
| 10.0 cu yds (Tandem Load) | 270 bags | $945.00 | $450.00 | Commercial Tandem (Save $495) |
Topsoil Calculator FAQs
How do I calculate how much topsoil I need for my lawn or garden?
Measure length and width in feet to determine square footage. Multiply square footage by your desired depth in inches, then divide by 324 to calculate cubic yards: (Square Feet × Depth in Inches) ÷ 324 = Cubic Yards. For example, a 1,200 sq ft lawn needing 2 inches of topsoil requires (1,200 × 2) ÷ 324 = 7.41 cubic yards. Add a 10% to 15% allowance to compensate for settling after initial watering.
How many square feet does 1 cubic yard of topsoil cover?
One cubic yard of topsoil covers exactly 324 square feet at 1 inch depth, 162 square feet at 2 inches depth, 108 square feet at 3 inches depth, 81 square feet at 4 inches depth, and 54 square feet at 6 inches depth. To calculate square foot coverage at any custom depth, simply divide 324 by your depth in inches (e.g., 324 ÷ 1.5 inches = 216 sq ft).
How deep should topsoil be for laying fresh sod or planting grass seed?
For new sod establishment or planting grass seed on a bare yard, civil landscape specifications require a minimum of 4 to 6 inches of rich, screened sandy loam topsoil over loosened subgrade. This provides adequate root zone depth for turf roots to penetrate deep into the profile, making the lawn resilient against summer drought heat stress.
How much topsoil do I need for lawn topdressing over existing grass?
For topdressing established turfgrass after core aeration, apply a thin layer of 1/4 to 1/2 inch of finely screened topsoil (or a 50/50 topsoil and compost blend). Never apply more than 1/2 inch at a single application, as burying grass crown nodes deeper than 1/2 inch will suffocate and kill living turf blades.
How many bags of topsoil make 1 cubic yard?
Retail topsoil bags are sold by cubic volume: one 1.0-cubic-foot bag requires 27 bags to equal 1 cubic yard (27 ÷ 1.0). For 0.75-cubic-foot bags, you need 36 bags. For 40-lb or 50-lb weight-rated bags, you typically need 42 to 50 bags per cubic yard depending on moisture content. For projects exceeding 2 cubic yards, bulk delivery is significantly more cost-effective.
How much does a cubic yard of screened topsoil weigh?
Dry, screened sandy loam topsoil weighs approximately 2,000 to 2,200 pounds (1.0 to 1.1 US tons) per cubic yard. When wet or saturated with rainwater, weight increases to 2,400 to 2,600 pounds (1.2 to 1.3 tons) per cubic yard. Topsoil blends enriched with high compost ratios are lighter, weighing 1,600 to 1,900 lbs/yd³.
What is the difference between screened topsoil and garden blend soil?
Standard screened topsoil is native mineral subgrade sifted through a mechanical trommel screen to remove rocks and clods larger than 1/2 inch. Garden blend (or planter mix) is an engineered soil recipe combining roughly 60% screened topsoil, 30% organic compost (or mushroom compost), and 10% coarse sand or perlite to maximize microbial fertility and aeration for vegetable roots.
Why does fresh topsoil settle after spreading and watering?
When soil is excavated and mechanically shredded through a screening trommel, it becomes aerated and "fluffed" up to 125% of its natural density. Upon first rain or hose irrigation, water pulls the loose soil particles together, settling the bed by 15% to 20%. Always rake topsoil slightly above surrounding grade before rolling or seeding.
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