Topsoil Calculator: Complete Guide
This topsoil calculator helps you figure exactly how much topsoil you need for gardening, landscaping, and lawn projects. Enter your dimensions and depth — get results in cubic yards, cubic feet, tons, and cost.
🌱 Quick Formula: Cubic Yards = (Length × Width × Depth) ÷ 27
Example: Garden bed 20' × 10' with 4" depth
Volume = 20 × 10 × (4/12) = 66.67 ft³ ÷ 27 = 2.47 cubic yards
How Much Topsoil Do You Need?
Topsoil depth varies by project type. Here are general recommendations:
- Lawn topdressing: 2-3 inches (5-7.5 cm)
- New lawn / seeding: 3-4 inches (7.5-10 cm)
- Garden beds: 4-6 inches (10-15 cm)
- Raised beds: 6-12 inches (15-30 cm)
- Landscaping / grading: 2-6 inches depending on use
Real-World Project Examples
- Small garden bed (10' × 5', 4" depth): 0.62 yd³ → ~$28 + delivery
- Medium lawn (30' × 20', 3" depth): 5.56 yd³ → ~$250 + delivery
- Large raised bed (12' × 4', 10" depth): 1.48 yd³ → ~$67 + delivery
- Full yard landscaping (50' × 40', 6" depth): 37.04 yd³ → ~$1,665 + delivery
📋 Real Project: Backyard Lawn Installation
Project: New lawn installation, Portland, OR | Size: 40' × 25' (1,000 sq ft)
📐 Calculations:
Area: 40' × 25' = 1,000 sq ft
Depth: 4 inches (0.333 ft)
Volume: 1,000 × 0.333 = 333 ft³ ÷ 27 = 12.3 yd³
Weight: 12.3 × 1.3 tons = 16 tons
Cost: 12.3 × $45 = $554 + $75 delivery = $629 total
5 Common Topsoil Calculation Mistakes
- Mixing units: Convert all measurements to the same unit (feet, inches, or meters).
- Forgetting to convert depth: Depth in inches must be divided by 12 for feet.
- Not accounting for settling: Topsoil settles 5-10% — order extra.
- Ignoring weight limits: Topsoil weighs ~1.3 tons per cubic yard — check truck capacity.
- Underestimating area: Always measure irregular areas carefully.
🔧 Topsoil Troubleshooting
Common topsoil estimation problems and solutions.
❌ "My topsoil order was too much or too little"
→ Double-check your area measurements and depth. Use the calculator above to verify. Add 10% for settling.
❌ "The topsoil was more expensive than expected"
→ Compare prices from multiple suppliers. Ask about bulk discounts for orders over 5-10 cubic yards.
❌ "My truck couldn't carry all the topsoil"
→ A standard pickup truck holds about 1-2 cubic yards. Larger dump trucks hold 5-10 cubic yards. Plan delivery accordingly.
Frequently Asked Questions
How many cubic yards of topsoil do I need?➕
Multiply your area (sq ft) by the depth in feet, then divide by 27. For a 100 sq ft area with 4" depth: 100 × 0.333 ÷ 27 = 1.23 cubic yards.
How much does a cubic yard of topsoil weigh?➕
A cubic yard of topsoil weighs approximately 1.2 to 1.5 tons (2,400-3,000 lbs) depending on moisture content and composition.
What is the cost of topsoil per cubic yard?➕
Topsoil costs typically range from $30-$60 per cubic yard, depending on quality and region. Delivery adds $50-$150 per load.
How deep should topsoil be for a garden?➕
Most garden beds need 4-6 inches of topsoil. Vegetables and deep-rooted plants may need 8-12 inches. Lawns typically need 3-4 inches.
Can I use topsoil for filling low spots?➕
Yes, topsoil is excellent for filling low spots in lawns. Use 2-4 inches at a time and allow it to settle before adding more.
