Topsoil Calculator
Estimate topsoil in cubic yards and tons for garden beds, lawn establishment, and raised beds.
Your Topsoil Estimate
- Measure your area — length and width. For irregular beds, break into rectangles.
- Choose depth — 2" for lawn repair, 4–6" for new gardens, 8–12" for raised beds.
- Adjust density — 75 lb/ft³ for screened topsoil. Compost-enriched blends may be lighter.
- Add 10% waste — topsoil settles after watering. Account for settling and spillage.
- Order screened soil — screened topsoil is free of rocks and debris. Unscreened is cheaper but lumpy.
How Much Topsoil Do I Need?
The depth of topsoil depends on what you're growing. Grass needs a minimum 4 inches of quality topsoil to establish strong roots. Vegetable gardens and flower beds perform best with 6 inches. Raised beds are typically filled 8 to 12 inches deep. For trees and shrubs, the planting hole should be backfilled with a mix of native soil and topsoil.
Quality matters as much as quantity. Good topsoil should be dark, crumbly, and smell earthy — not sour. Ask your supplier if the topsoil is screened (rocks and debris removed) and whether it contains compost. A 60/40 topsoil-compost blend is ideal for gardens and new lawns.
Topsoil Depth Guidelines
Match the depth to your project for the best results:
| Project | Depth | Notes |
|---|---|---|
| Lawn overseeding | 1–2 in | Spread thin, rake into existing grass |
| New lawn from seed | 4 in | Minimum for healthy root development |
| New lawn from sod | 4–6 in | Grade and compact before laying sod |
| Flower beds | 6 in | Amend with compost for best results |
| Vegetable garden | 6–8 in | Deep roots need deep soil |
| Raised beds | 8–12 in | Use a topsoil/compost blend |
For raised beds, a popular fill recipe is 60% topsoil, 30% compost, and 10% perlite or coarse sand for drainage.
Topsoil Coverage Quick Reference
| Area | 4" Deep | 6" Deep | 12" Deep |
|---|---|---|---|
| 100 ft² | 1.23 yd³ (1.0 tons) | 1.85 yd³ (1.5 tons) | 3.70 yd³ (3.0 tons) |
| 250 ft² | 3.09 yd³ (2.5 tons) | 4.63 yd³ (3.7 tons) | 9.26 yd³ (7.4 tons) |
| 500 ft² | 6.17 yd³ (4.9 tons) | 9.26 yd³ (7.4 tons) | 18.52 yd³ (14.8 tons) |
| 1,000 ft² | 12.35 yd³ (9.9 tons) | 18.52 yd³ (14.8 tons) | 37.04 yd³ (29.6 tons) |
Based on 75 lb/ft³ screened topsoil. Includes 10% waste/settling.
Formulas
Volume and weight:
Cubic yards = Volume ÷ 27
Weight (tons) = Volume × 75 ÷ 2,000
40 lb bags = Weight (lb) ÷ 40
Topsoil density varies with moisture. Dry screened topsoil: ~75 lb/ft³. Wet topsoil: ~90–100 lb/ft³.
Related Calculators
Topsoil goes down first — then layer mulch or seed on top. See our complete landscaping calculator collection for compost, mulch, and sod.
Frequently Asked Questions
What is the difference between topsoil and garden soil?
Topsoil is the natural upper layer of earth — it's screened to remove debris but not enriched. Garden soil (or garden mix) is topsoil blended with compost, peat, and sometimes fertilizer. Garden soil costs more per yard but is ready to plant in. Topsoil needs amendment for most gardening applications.
How many cubic yards of topsoil fit in a pickup truck?
A standard half-ton pickup truck (F-150, Silverado 1500) can safely carry about ½ cubic yard of topsoil — which weighs 1,000–1,500 lbs depending on moisture. A three-quarter or one-ton truck can handle ¾ to 1 cubic yard. Overloading damages suspension and tires, and is unsafe. For quantities over 1 cubic yard, delivery is usually cheaper and safer.
How much topsoil do I need to fill a raised garden bed?
A standard 4×8 ft raised bed filled 12 inches deep requires approximately 32 cubic feet, or about 1.2 cubic yards. Most raised beds are filled 6–12 inches deep. Use the calculator above for your exact dimensions. For deep beds, you can fill the bottom half with cheaper fill or wood (hugelkultur method) and use quality topsoil blend for the top 6–8 inches where plants root.
How deep should topsoil be for a lawn?
Grass roots need at least 4–6 inches of quality topsoil. For new lawns on subsoil or fill, a 6-inch layer of topsoil is the minimum for healthy turf. Vegetable gardens and flowerbeds benefit from 12 inches. If adding topsoil over existing lawn, limit additions to 1–2 inches per year to avoid smothering existing grass — grass can recover from thin topdressing but not from being buried.
How deep should topsoil be for a new lawn?
For a new lawn from seed or sod, 4 inches of quality topsoil is the practical minimum — grass roots need loose, nutrient-rich soil to establish quickly. Six inches is better in compacted or poor-quality subsoil. If you're laying sod, the sod itself is about 1 inch thick, so place it on 4–5 inches of prepared topsoil so the finished grade is correct. Till the top 2 inches before laying sod or seeding to eliminate the interface layer where roots can stall.