How to estimate window box soil cost
Calculate volume first, convert that volume to tons using material density, then multiply by price per ton. The default example returns 37 USD.
Density and price per ton drive the result
Bulk material cost changes with density, moisture, compaction, supplier rounding, delivery minimums, and local price per ton. Use supplier numbers when you have them.
Cost is not only volume
Two materials can cover the same area at the same depth but cost different amounts because density, tonnage, delivery, and unit price differ.
Soil and topsoil example estimates
Examples are before waste and settling. Final grade, moisture, and material type can change the quantity.
| Project example | Area and depth | Cubic yards |
|---|---|---|
| Lawn topdress | 500 sq ft at 1 in | 1.54 cu yd |
| Light leveling | 500 sq ft at 2 in | 3.09 cu yd |
| New planting bed | 300 sq ft at 4 in | 3.70 cu yd |
| Deeper soil fill | 300 sq ft at 6 in | 5.56 cu yd |
| Low area fill | 500 sq ft at 12 in | 18.52 cu yd |
Soil coverage by depth
Coverage assumes 1 cubic yard, which is 27 cubic feet. Waste, compaction, settling, and irregular grade are not included.
| Depth | Coverage from 1 cu yd | Coverage from 2 cu yd |
|---|---|---|
| 1 in | 324 sq ft | 648 sq ft |
| 2 in | 162 sq ft | 324 sq ft |
| 3 in | 108 sq ft | 216 sq ft |
| 4 in | 81 sq ft | 162 sq ft |
| 6 in | 54 sq ft | 108 sq ft |
| 12 in | 27 sq ft | 54 sq ft |
Common density planning values
Use supplier-provided density for final tonnage. These broad values are planning placeholders, not product specifications.
| Material | Broad planning density | Notes |
|---|---|---|
| Gravel / crushed stone | 2,600-3,000 lb/cu yd | Varies by gradation, moisture, and compaction. |
| Sand | 2,400-3,000 lb/cu yd | Moisture can noticeably change weight. |
| Topsoil / dirt | 1,800-2,600 lb/cu yd | Moisture and organic matter change density. |
| Mulch | 400-1,000 lb/cu yd | Usually ordered by volume, not weight. |
| Compost | 800-1,500 lb/cu yd | Depends on moisture and material mix. |
Before you calculate
- Measure inside bed dimensions for raised beds, not the outside lumber footprint.
- Use different estimates for topsoil, compost amendments, and fill dirt if the project uses layers.
- Account for settling when filling deep beds or low areas.
Common mistakes
- Using lawn topdressing depth for raised bed fill.
- Forgetting that bagged soil is sold by volume and bulk soil may settle.
- Ignoring existing soil, amendments, and final grade.
Formula
cost = ((area * (depth / 12) / 27) * (1 + wastePercent / 100) * densityPerCubicYard / 2000) * pricePerTon
Assumptions
- Depth is entered in inches.
- Density and price per ton vary by quarry, moisture, gradation, and compaction.
- Delivery, base prep, fabric, grading, disposal, and labor are separate.
Example
Estimated window box soil cost: 37 USD
How to estimate window box soil cost
- Measure project area and planned depth, then estimate material volume.
- Enter supplier density so the calculator can convert volume into tons.
- Enter price per ton and include waste or delivery buffer if applicable.
- Multiply estimated tons by the price per ton to get a planning cost.
- Confirm local price, delivery minimums, moisture, compaction, and tax or fees with the supplier.
Before you buy materials
- Compare cubic-yard bulk delivery with bagged soil volume before buying.
- For garden beds, verify the material mix rather than buying only by volume.
FAQ
How do I estimate window box soil cost?
Convert area and depth to cubic yards, convert cubic yards to tons using density, add waste, then multiply by price per ton.
What is the example window box soil cost?
Using the default inputs, the example planning estimate is 37 USD.
Why does density matter?
Density converts volume into tons. Since bulk material is often priced per ton, density can change the cost even when the cubic-yard volume is the same.
Does this include delivery?
Only if delivery is included in the entered price or added separately. Supplier delivery minimums, taxes, and access fees can change the final quote.
Related calculators
This calculator is for planning estimates only. Verify final quantities with product labels, project conditions, and a qualified professional when accuracy matters.