Quick Answer: To calculate topsoil, multiply Length (ft) x Width (ft) x Depth (in) / 12 / 27 to get cubic yards. Screened topsoil weighs ~2,200 lbs/cu yd (1.1 tons). Use 4-6 inches for new lawns, 2-3 inches for topdressing, and 12+ inches for raised beds. A 10 x 20 ft area at 4 inches deep needs about 2.47 cubic yards (2.7 tons). Add 10% for settling. Bulk topsoil costs $20-40 per cubic yard.
Calculate how much topsoil you need for lawns, garden beds, raised beds, and grading projects. Enter your dimensions and depth to get the exact amount in cubic yards, total weight, number of bags, and estimated cost.
How to Calculate Topsoil
The formula for calculating topsoil volume:
- Measure the length and width of the area in feet.
- Choose your topsoil depth based on the project (see depth guide below).
- Multiply length × width to get square footage.
- Multiply by depth (converted to feet) to get cubic feet, then divide by 27 for cubic yards.
- Multiply cubic yards by soil density to get the weight in pounds.
- Add 10% for settling, compaction, and uneven terrain.
Topsoil Depth Recommendations
The right depth depends on what you are growing and the condition of your existing soil:
| Application | Depth | Cu Yd per 1,000 sq ft |
|---|---|---|
| Topdressing existing lawn | 1/4 - 1/2 inch | 0.77 - 1.54 |
| Overseeding lawn | 1 - 2 inches | 3.1 - 6.2 |
| New lawn installation | 4 - 6 inches | 12.3 - 18.5 |
| Flower beds | 6 - 8 inches | 18.5 - 24.7 |
| Raised garden beds | 8 - 12 inches | 24.7 - 37.0 |
| Vegetable gardens | 12 - 18 inches | 37.0 - 55.6 |
Types of Topsoil
- Screened Topsoil: Natural topsoil passed through a screen to remove rocks, roots, and debris. The most common and affordable option for lawns and general landscaping. Weighs about 2,200 lbs per cubic yard.
- Unscreened Topsoil: Raw topsoil that may contain small rocks, roots, and clumps. Cheaper than screened but requires more preparation. Best for rough grading and fill. Weighs about 2,400 lbs per cubic yard.
- Organic Garden Mix: Topsoil blended with compost, peat moss, and sometimes perlite. Ideal for flower beds and vegetable gardens where nutrient-rich soil is important. Lighter at about 1,800 lbs per cubic yard.
- Compost Blend: A mix of topsoil and aged compost (usually 50/50 or 60/40). Excellent for amending poor existing soil and boosting organic matter. Lightest option at about 1,600 lbs per cubic yard.
- Sandy Loam: Topsoil with a higher sand content for improved drainage. Best for areas prone to standing water, French drains, and plants that prefer well-drained soil. Heavier at about 2,500 lbs per cubic yard.
Tips for Buying Topsoil
- Test your existing soil first: A $15 soil test from your county extension office tells you exactly what amendments you need. You may be able to improve your existing soil rather than replacing it entirely.
- Buy in bulk for large projects: Bulk topsoil costs $20-40 per cubic yard versus $70-180 per yard equivalent in bags. Most suppliers deliver for $50-150 depending on distance.
- Check the source: Ask where the topsoil comes from. Good topsoil is dark brown to black, crumbles easily in your hand, and smells earthy — not like chemicals or sewage.
- Plan for compaction: Topsoil settles 10-15% after watering and rain. Order 10-15% more than calculated, especially for raised beds that must maintain a specific height.
- Delivery timing: Schedule delivery for dry weather. Wet topsoil is heavy, difficult to spread, and can damage your lawn under truck tires. Have a tarp ready to cover the pile.
Formula Summary
Topsoil Volume Formula: Multiply Length (ft) x Width (ft) x Depth (in), divide by 12 to convert depth to feet, then divide by 27 to get cubic yards.
V(cu yd) = (L(ft) × W(ft) × D(in)) / (12 × 27)
Weight Formula: W(lbs) = V(cu yd) × (1 + W%) × ρ where ρ is the soil density in lbs/cu yd.
Bag Count: Bags(40 lb) = ⌈W(lbs) / 40⌉
| Soil Type | Density (lbs/cu yd) |
|---|---|
| Screened Topsoil | 2,200 |
| Unscreened Topsoil | 2,400 |
| Organic Garden Mix | 1,800 |
| Compost Blend | 1,600 |
| Sandy Loam | 2,500 |
Standard Assumptions: Waste factor 10% for settling and uneven terrain. 1 cubic yard = 27 cubic feet. Standard bag size 40 lbs (~0.75 cu ft). 1 ton = 2,000 lbs. Depth recommendations: new lawns 4-6", topdressing 1/4-1/2", raised beds 8-12".
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Related Calculators
- Mulch Calculator — calculate mulch for garden beds and landscaping
- Raised Bed Soil Calculator — calculate soil for raised garden beds
- Sod Calculator — estimate sod for new lawns
- Sand Calculator — calculate sand for leveling and fill
Estimates are for planning purposes only. Consult a qualified contractor for critical projects. Actual material requirements may vary based on site conditions, waste, and installation methods.
Pricing last verified: February 2026. Material prices vary by region, season, and supplier. Prices shown are national averages for planning purposes.