Raised Bed Layer Fill calculator.
Calculate separate fill layers inside a bed while subtracting existing fill and known solid inserts.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Layer depths describe your supplied plan. Existing material is assigned to the bottom layer first; plant spacing and soil recipes are excluded.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Internal base area
- 4 m²
- Existing fill depth
- 0.1 m
- Known solid displacement
- 0.1 m³
- Planned layer depth
- 0.2 m
- Planned layer depth
- 0.2 m
New fill after displacement: 1.1 m³
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Layer depths describe your supplied plan. Existing material is assigned to the bottom layer first; plant spacing and soil recipes are excluded.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.