Raised-bed soil volume uses the inside planting dimensions, not the outside lumber footprint. Soil blend proportions should reflect the plants, drainage, existing material, and product guidance rather than a universal recipe.
Raised-bed soil volume = inside length × inside width × soil depth. Convert cubic feet to cubic yards for bulk orders, then multiply total volume by each chosen blend percentage if you are planning a multi-component soil mix.
Published: September 30, 2026
Last reviewed: September 30, 2026
Published by BuildYard. The guide reflects BuildYard's calculation methodology and editorial standards and does not replace project-specific professional advice.
Volume = inside length × inside width × soil depth.
For tapered or irregular beds, divide the bed into simpler zones.
Divide cubic feet by 27 for cubic yards when ordering bulk soil.
For bags, use the package's stated cubic-foot volume.
Multiply total required volume by each selected blend percentage.
Make sure component percentages total 100 percent.
Existing soil, settling, freeboard, and plant root balls can change actual fill demand.
Keep any settlement allowance visible instead of hiding it in the geometry.
Calculate playground surfacing volume from use-zone area and required installed depth while separating safety design from quantity math.
Read guide →Landscaping & YardEstimate pine-straw bales from net bed area and supplier-stated coverage while accounting explicitly for depth and refresh conditions.
Read guide →Landscaping & YardEstimate garden soil cubic feet, cubic yards, and bags from bed area, fill depth, and product package volume.
Read guide →Inside-dimension example before any project-specific settling allowance.
| Step | Calculation | Result |
|---|---|---|
| Depth | 18÷12 | 1.5 ft |
| Volume | 8×4×1.5 | 48 cu ft |
| Cubic yards | 48÷27 | 1.78 yd³ |
Current manufacturer data, supplier specifications, drawings, field measurements, applicable codes, permit requirements, and qualified professional guidance can take priority over a general-purpose planning estimate.