Garden & Landscaping calculator
Topsoil Calculator
Calculate topsoil volume and approximate tonnes for lawn preparation, grading or planting areas at a specified soil depth.
Calculate topsoil volume and approximate tonnes for lawn preparation, grading or planting areas at a specified soil depth. Use finished project dimensions and product-specific data where available rather than generic defaults. The most sensitive assumption here is settlement and finished depth. Freshly placed topsoil can settle, especially when loose or organic-rich. Order for the intended finished depth and consider the supplier's expected settlement.
What you need to enter
The Topsoil Calculator uses the following project information to calculate the result.
- Length
- Width
- Depth
- Material density
- Extra allowance (%)
Calculator result
Volume and estimated weight
How the Topsoil Calculator works
For topsoil volume for lawns, beds and levelling, the calculator uses volume = L×W×D; mass = volume×density. The mathematics is only one part of the estimate: getting settlement and finished depth right usually matters more to the real-world result than extra decimal places. Unit conversion happens before the calculation.
Topsoil Calculator worked example
Topsoil Calculator example: For a 10 m × 3 m area at 50 mm depth, volume is 1.50 m³. If the selected topsoil material has a bulk density of 1.6 t/m³, that is about 2.4 tonnes before the chosen allowance. Use the numerical result as the starting point, then verify settlement and finished depth against the material, layout or equipment actually being used.
Important calculation assumptions
For topsoil volume for lawns, beds and levelling, freshly placed topsoil can settle, especially when loose or organic-rich. Order for the intended finished depth and consider the supplier's expected settlement.
Frequently asked questions
Do I need exact project measurements for the Topsoil Calculator?
Measure the area to be covered and the finished topsoil depth needed for the lawn, border or grading work. If converting volume to tonnes, use a supplier density that reflects the delivered moisture and compaction condition.
What if my assumption for settlement and finished depth is wrong in the Topsoil Calculator?
Before relying on the Topsoil Calculator, check settlement and finished depth. Freshly placed topsoil can settle, especially when loose or organic-rich. Order for the intended finished depth and consider the supplier's expected settlement.
How should I round the Topsoil Calculator result for purchasing?
For the Topsoil Calculator, the numerical answer still needs a real-world check. Order by volume or supplier tonnage and allow for settlement if the finished level matters. Screened topsoil and blended topsoil can have different densities.