Calculate How Much Soil You Need
Formula Used
Rectangle area: length × width.
Circle area: 3.1416 × radius × radius.
Triangle area: 0.5 × base × height.
Trapezoid area: ((side A + side B) ÷ 2) × height.
Average depth: (starting depth + ending depth) ÷ 2.
Base soil volume: total area × average depth.
Order volume: base volume × (1 + waste percent) ÷ (1 − compaction percent).
Bags needed: round up order volume ÷ bag volume.
Bulk yards: cubic feet ÷ 27.
Estimated weight: order volume × soil density.
How to Use This Calculator
Select the area shape first. Enter the related dimensions only. Use rectangle fields for beds, lawns, pads, and backfill zones with straight sides. Use circle fields for round planters. Use custom area when you already know the measured surface area.
Enter starting and ending depth when the soil layer slopes. Keep both depths the same for a level layer. Add waste for edging, spills, grading corrections, and uneven surfaces. Add compaction when loose soil will settle after watering or rolling.
Enter bag size, bulk price, bag price, and delivery fee. Submit the form. The result appears above the form. Use CSV or PDF buttons to save the estimate.
Example Data Table
| Project |
Shape |
Dimensions |
Depth |
Waste |
Compaction |
Likely Order Type |
| Raised garden bed |
Rectangle |
8 ft × 4 ft |
12 in |
10% |
8% |
Bags or small bulk load |
| Lawn top dressing |
Custom area |
600 sq ft |
2 in |
12% |
5% |
Bulk soil |
| Round planter |
Circle |
6 ft diameter |
10 in |
8% |
10% |
Bags |
| Backfill strip |
Rectangle |
30 ft × 2 ft |
18 in |
15% |
15% |
Bulk soil |
Why Soil Quantity Matters
Soil orders look simple, but small errors can become expensive. A shallow garden bed may need only a few bags. A large lawn repair can need many cubic yards. Construction backfill also changes after compaction. This calculator helps you plan before you buy. It turns length, width, diameter, area, and depth into practical soil quantities.
Important Planning Factors
Depth is the biggest driver. A two inch dressing is very different from a twelve inch raised bed. Shape also matters. Rectangular beds, round beds, triangular areas, and custom measured areas can be handled. Waste should be added for spills, uneven ground, edging gaps, and grading corrections. Compaction should be included when loose soil settles after watering, rolling, or foot traffic.
Bags Versus Bulk Loads
Bagged soil is useful for small areas and clean jobs. It is easy to carry and store. Bulk soil is usually better for larger projects. It is delivered by the cubic yard. Bulk loads can reduce handling time, but they need room for unloading. The calculator compares both options when prices are entered. It also estimates bag count, bulk volume, and approximate weight.
Using Results on Site
Use the final volume as an ordering guide, not a survey replacement. Check low spots before ordering. Measure each separate bed when the site has different depths. For raised planters, measure the inside dimensions. For trenches, use the true trench width and planned fill depth. For lawns, keep depth consistent across the repair area.
Better Soil Decisions
A good soil estimate protects time, money, and project quality. Too little soil causes delays and extra delivery charges. Too much soil creates storage and disposal problems. This tool gives a clear starting point for landscaping, gardening, grading, and light construction work. It supports practical choices by showing formulas, conversions, waste, compaction, costs, and example data in one place.
Common Measurement Tips
Measure twice when edges are irregular. Round up depth when soil will be leveled after spreading. Keep units consistent while entering values. Mark long beds into smaller rectangles if the layout bends. For circular beds, use the average diameter. When soil quality is critical, confirm bulk density and bag volume from the supplier before final material purchase.
FAQs
How do I calculate soil for a rectangular bed?
Multiply length by width to find area. Then multiply area by depth. Add waste and compaction adjustments. The calculator does these steps and converts the answer into bags, cubic feet, cubic yards, liters, and cubic meters.
Should I use starting and ending depth?
Use both when the ground slopes or the layer is uneven. The calculator averages them. For a level bed, enter the same value in both depth fields.
What waste percentage should I add?
Many small projects use 5% to 15%. Irregular edges, spills, grading errors, and low spots need more. Large rough backfill areas may need a larger allowance.
What does compaction mean?
Compaction is settling after soil is watered, walked on, rolled, or loaded. Loose soil often reduces in height. The calculator increases the order amount to offset that loss.
When should I order bulk soil?
Bulk soil is often better when the estimate reaches about one cubic yard or more. Bags are easier for small beds, planters, and repair areas.
How many cubic feet are in one cubic yard?
One cubic yard contains 27 cubic feet. The calculator uses this conversion when showing bulk order volume.
Can this calculator estimate soil weight?
Yes. Enter a soil density in pounds per cubic foot. The calculator multiplies density by order volume and shows weight in pounds, tons, and kilograms.
Can I save the result?
Yes. After calculation, use the CSV button for spreadsheet data. Use the PDF button for a simple printable estimate.