Topsoil Calculator
Enter the area dimensions and desired depth to compute the volume of topsoil in cubic yards and estimate cost. Works for gardens, raised beds, and lawn topdressing.
Topsoil is the foundation of healthy gardens, lawns, and landscape beds. Good topsoil contains organic matter, microbes, and proper drainage characteristics that allow plants to thrive. This calculator returns the volume of topsoil needed for a project — measured in cubic yards (the standard bulk material unit) — along with cost estimates.
The math: cubic yards = (length × width × depth in inches / 12 / 27). One cubic yard is 27 cubic feet (3 ft × 3 ft × 3 ft), or about 1000-1400 pounds depending on moisture content. Typical lawn applications need 4-6 inches of topsoil; vegetable gardens 8-12 inches; raised beds 12-18 inches; new construction grading often needs 6-12 inches.
Topsoil prices vary widely: bulk delivered topsoil costs $20-50 per cubic yard plus delivery. Pre-bagged topsoil from home centers costs much more per equivalent volume ($4-6 per cubic foot = $108-162 per cubic yard) but is convenient for small projects. For projects over 1 cubic yard, bulk delivery is the cost-effective choice.
Inputs
Results
Cubic Yards Needed
3.70
Estimated Weight
4.07 tons
Total Cost
$129.63
Topsoil Details
| Measurement | Value |
|---|---|
| Area | 200 sq ft |
| Depth | 6 inches (0.50 ft) |
| Volume (cubic feet) | 100.0 |
| Volume (cubic yards) | 3.70 |
| Estimated Weight | 4.07 tons |
| Price per Yard | $35 |
| Total Cost | $129.63 |
Formula
How to use this calculator
- Enter area length and width in feet.
- Enter desired depth in inches.
- Enter price per cubic yard (varies by supplier and quality).
- Calculator returns cubic yards needed and total cost.
- Add 5-10% for delivery loss and spread variation.
- Factor in delivery fee separately.
Worked examples
New lawn establishment
**Scenario:** Establishing new lawn on 1000 sq ft area. Need 4 inches of quality topsoil. **Calculation:** Volume: 1000 × (4/12) = 333.3 cu ft = 12.3 cu yd. At $35/yd: $432 topsoil. Plus delivery ($100): $532 total. Sod or seed additional ($300-1500). **Result:** ~$530 in topsoil for new lawn establishment. Total project (with grass): $830-2050 depending on sod vs seed. Sod establishes immediately ($1-2/sq ft); seed costs $0.25-1/sq ft but takes weeks to establish.
Vegetable garden bed
**Scenario:** Build 8 × 16 ft vegetable garden bed, 12 inches of topsoil. **Calculation:** Volume: 8 × 16 × 1 = 128 cu ft = 4.74 cu yd. At $40/yd for premium organic topsoil: $190. Plus delivery: ~$250 total. Plus compost amendments ($100): $350. **Result:** ~$350 for productive 128 sq ft vegetable garden. Will support tomatoes, peppers, lettuce, herbs, etc. Annual amendment with compost ($25-50/year) maintains soil quality. Productive vegetable garden saves $200-500/year in produce costs.
Slope grading project
**Scenario:** Fill in sloped backyard area, average 8 inches depth over 30 × 25 ft area. **Calculation:** Volume: 30 × 25 × (8/12) = 500 cu ft = 18.5 cu yd. At $25/yd for bulk topsoil (large order discount): $463. Plus delivery ($150 for large load): $613. Plus spread service ($300): $913. **Result:** $613-913 for substantial grading project. Large bulk orders qualify for delivery discounts. Spreading 18 yards is significant labor — pro spreading often worth the cost. For DIY: budget 2-3 weekends with help.
When to use this calculator
**Add topsoil to your project for:**
- **New lawn establishment**: foundation for grass roots. - **Garden bed preparation**: nutrient-rich soil for plants. - **Raised bed construction**: full bed fill with quality medium. - **Tree and shrub planting**: amend planting holes. - **Grade adjustment**: filling low spots, creating mounds. - **Soil restoration**: replenishing depleted areas. - **Lawn topdressing**: thin layer for maintenance.
**Choosing the right topsoil:**
- **Vegetable gardens**: compost-amended or organic blends. - **Lawns**: screened topsoil with grass-friendly nutrients. - **Foundation plantings**: well-draining loamy soil. - **Heavy water needs (xeriscape)**: sandy loam. - **Acid-loving plants** (rhododendrons): peat-amended. - **Drainage problems**: sandy or coarse mix.
**Site preparation:**
- **Clear debris**: rocks, roots, old vegetation. - **Test existing soil**: pH and nutrient levels. - **Grade subsoil**: provide proper slope before topsoil. - **Compact subsoil**: prevent settling later. - **Set elevation**: account for compaction over time.
**Spreading methodology:**
- **Spread evenly**: avoid piling. - **Rake smooth**: remove rocks and lumps. - **Light compaction**: water and lightly walk on it. - **Add second layer if needed**: better than over-compacting one layer. - **Final grade for drainage**: 1-2% slope away from buildings.
**Mixing with existing soil:**
- **Top 2-3 inches**: incorporate into existing topsoil. - **Below 6 inches**: leave existing soil to support root growth. - **Don't bury existing topsoil deep**: it has microbial life worth preserving.
**Seasonal timing:**
- **Spring**: best for most plants. Soil workable, plant immediately. - **Fall**: good for cover crops and dormant grasses. Soil cooler. - **Avoid**: wet conditions (compaction damage), extreme heat (drought stress).
**Cost saving strategies:**
- **Buy bulk**: 50-70% cheaper than bagged. - **Off-season delivery**: lower demand = lower price. - **Combined orders**: split delivery cost with neighbor. - **Local screening**: smaller landscape yards often cheaper than big suppliers. - **DIY screening**: screen existing soil yourself (saves labor cost).
**Amendments to consider:**
| Goal | Add | |---|---| | Improve drainage | Coarse sand, compost | | Reduce acidity | Lime | | Increase acidity | Sulfur | | Add nutrients | Aged compost | | Increase organic matter | Compost, mulch | | Improve water retention | Compost, peat moss | | Faster grass growth | Lawn-specific fertilizer | | Vegetable production | Compost, slow-release fertilizer |
**Composting alongside:**
- Build a compost pile for ongoing soil improvement. - Material: yard waste, kitchen scraps, fall leaves. - Time: 6 months to 1 year for usable compost. - Cost: minimal once started. - Compost adds 50-100 lbs of nutrient-rich amendment per cubic yard.
**Long-term soil care:**
- **Annual amendment**: 1-3 inches of compost. - **Mulching**: 2-3 inches around plants. - **Cover cropping**: between rotations. - **Avoiding over-tilling**: preserves soil structure. - **Earthworm encouragement**: don't use synthetic chemicals if avoidable.
**Common topsoil project mistakes:**
- Buying fill dirt instead of topsoil (cheaper but useless for plants). - Applying too thin (less than 4" for new plantings). - Not testing soil first (waste of money if amendments needed). - Over-spreading (smothers existing root systems). - Compacting wet soil (destroys structure permanently). - Skipping mulch after spreading. - Using same source for everything (different uses need different soil).
**Insurance and code:**
- Most topsoil work doesn't require permits. - Major grading may require permits (drainage changes). - Hillside stabilization may require engineering. - Property boundary fills need legal review. - HOA approval often needed for major landscape changes.
Common mistakes to avoid
- Buying fill dirt instead of topsoil. Fill dirt has no nutrients; won't grow plants.
- Applying too thin. Less than 4" depth is inadequate for new plantings.
- Skipping soil testing. May add unnecessary amendments or miss needed ones.
- Compacting freshly spread soil. Destroys structure; reduces drainage and root growth.
- Working wet soil. Causes long-term damage; wait for soil to drain.
- Buying small bags from home center. Cost per cubic foot is 3-4× bulk price.
- Not amending with compost. Topsoil alone often lacks long-term nutrients.