Enter your area dimensions to instantly calculate the topsoil needed.
How the Topsoil Calculator Works
Enter Length, Width & Depth
Calculate Cubic Yards of Soil Needed
Select Your Bag Size
Get Bulk or Bag Quantity to Order
What is a Topsoil Calculator?
A Topsoil Calculator estimates how much topsoil you need for a garden bed, new lawn, raised bed, or general landscaping project, based on the area's length, width, and desired soil depth. Topsoil is typically sold either in bulk by the cubic yard (for larger projects) or in bags measured in cubic feet (for smaller projects), and this calculator gives you both figures so you can choose the most practical and cost-effective ordering option.
The Topsoil Calculation Formula
Cubic Yards = (Length × Width × Depth in feet) ÷ 27
Bags Needed = (Volume in cubic feet) ÷ Bag Size
Since depth is usually specified in inches, the calculator converts it to feet automatically. For smaller garden beds, buying bagged topsoil is often more practical, while larger areas are typically far more cost-effective to fill with a bulk delivery measured in cubic yards.
Recommended Topsoil Depth by Project
| Project | Recommended Depth |
|---|---|
| New lawn (over existing soil) | 2 – 4 inches |
| New lawn (from scratch/bare ground) | 4 – 6 inches |
| Vegetable garden beds | 8 – 12 inches |
| Flower beds | 6 – 8 inches |
| Raised garden beds | Fill to bed height (typically 8 – 18 inches) |
| Topdressing existing lawn | 0.25 – 0.5 inches |
Bulk Topsoil vs Bagged Topsoil
- Bulk (by the yard): Far more cost-effective for larger projects (typically anything over 1-2 cubic yards), delivered directly to your property.
- Bagged: More convenient for small projects, container gardening, or when you don't have space for a bulk delivery pile, though it costs significantly more per cubic yard.
As a rule of thumb, if your calculated volume exceeds roughly 1 cubic yard (27 cubic feet), bulk delivery is usually the more economical choice.
Tips for Buying and Using Topsoil
- Choose quality topsoil: Screened, weed-free topsoil blended with compost performs significantly better than raw fill dirt for gardening.
- Order 10% extra: Settling and uneven ground application typically require slightly more material than the exact calculation.
- Consider a soil test first: For vegetable gardens, testing existing soil can help you decide whether to amend rather than fully replace it.
- Mix with compost for garden beds: Blending topsoil with compost (often 60/40 or 70/30) improves nutrient content for planting.
Frequently Asked Questions
How much topsoil do I need for a raised garden bed?
Multiply your bed's length, width, and height (in feet) to get cubic feet, then divide by 27 for cubic yards — or simply enter those dimensions into the calculator above.
Is topsoil the same as garden soil or potting soil?
No, topsoil is typically used for larger-scale lawn and landscaping projects, while garden soil and potting soil are specially formulated blends with added nutrients, better suited for container gardening and specific plant needs.
Should I buy bagged or bulk topsoil?
For projects needing more than about 1 cubic yard, bulk delivery is typically much more cost-effective than buying multiple bags.
How deep should topsoil be for a new lawn?
Most experts recommend 4 to 6 inches of quality topsoil for establishing a new lawn from bare ground, tapering to 2-4 inches if applying over existing soil.