Soil (Topsoil) Calculator
Calculate exactly how much topsoil, fill dirt, or garden soil to order. Enter your area and desired depth to get total volume in cubic yards and cubic feet, truckloads needed, bags required, and cost estimate.
Soil Calculator Tool
Why use this free soil calculator?
Built with the features most competitors miss — deeper inputs, benchmark data, and actionable guidance alongside the core calculation.
How to use this soil calculator
Coverage per cubic yard by depth
| Depth | Per cu yd | Per 2 cu ft bag | Typical use |
|---|---|---|---|
| 1 inch | 324 sq ft | 21.6 sq ft | Light top-dress |
| 2 inches | 162 sq ft | 10.8 sq ft | Standard application |
| 3 inches | 108 sq ft | 7.2 sq ft | New beds / heavy mulch |
| 4 inches | 81 sq ft | 5.4 sq ft | Deep mulch / weed suppression |
How this calculator compares
LazyTools fills the gaps most competing tools leave open — deeper analysis, benchmark context, and actionable guidance alongside the core calculation.
| Feature | LazyTools | OmniCalculator | Lowes.com | HomeDepot.com |
|---|---|---|---|---|
| Cubic yards and cubic feet | ✓ Yes | ✓ | ✓ | ✓ |
| Bags needed | ✓ Yes | ✓ | ✓ | ✓ |
| Cost estimate | ✓ Yes | ✓ | ✓ | ✓ |
| Custom depth | ✓ Yes | ✓ | ✗ | ✗ |
| Coverage reference table | ✓ Yes | ✗ | ✗ | ✗ |
| No sign-in required | ✓ Yes | ✓ | ✗ | ✗ |
Soil Calculator: Complete Guide
Whether you are filling a raised bed, top-dressing a lawn, levelling low spots, or establishing a new garden area, calculating the right volume of soil before ordering prevents costly over-ordering or frustrating shortfalls mid-project.
The soil volume formula
Volume (cu yd) = Area (sq ft) x Depth (in) / 324. One cubic yard covers 324 sq ft at 1-inch depth, 162 sq ft at 2 inches, or 108 sq ft at 3 inches. For raised beds, use the internal length x width x height. A 4x8 ft raised bed 12 inches deep needs 4 x 8 x 12 / 324 = 1.19 cu yd of soil.
Topsoil vs fill dirt vs garden soil
Fill dirt is subsoil, low in organic matter, used for structural fill and grading. It is the cheapest option but not suitable for planting. Topsoil is the upper layer of native soil with some organic matter — variable in quality. Screened topsoil removes rocks and debris and is suitable for lawns and general planting. Garden soil or amended topsoil contains added compost and nutrients and is best for vegetable beds and flower borders.
How much topsoil does a lawn need?
A new lawn from seed on a bare area needs at least 4 to 6 inches of good topsoil. Top-dressing an existing lawn for levelling or organic matter addition: 0.25 to 0.5 inches per application. Over-applying to an established lawn smothers the grass. Lawn top-dressing is most effective when combined with aeration.
Soil volume for raised beds
A standard 4x8 ft raised bed at 12 inches depth needs 1.19 cu yd (32 cu ft) of growing medium. Most gardeners use a mix of topsoil (50%), compost (30%), and coarse perlite or vermiculite (20%). A 4x4 ft bed at 8 inches deep needs 0.40 cu yd (10.7 cu ft). Calculate each bed dimension separately and sum for a multi-bed order.
Bulk delivery vs bagged soil
Bulk screened topsoil is typically $20 to $50 per cubic yard. Bagged "garden soil" at $8 per 1 cu ft bag is equivalent to $216 per cubic yard — 4 to 10x more expensive. For any project over 1 to 2 cubic yards, bulk delivery is almost always more cost-effective. One dump truck load (10 to 14 cu yd) covers a 20x20 ft raised bed area 8 inches deep or fills approximately 12 standard 4x8 raised beds.