Soil & Topsoil Calculator
Estimate topsoil, garden mix or veggie mix volume for your project. See cubic metres first, plus indicative weight and ordering equivalents.
Calculate Your Soil
Editable presets only — confirm the required depth for your project
Total Volume
Volume: Length × Width × Depth (converted to metres). For circles: π × radius² × depth. For triangles: ½ × base × height × depth.
Weight: Volume × the selected indicative density. Confirm the exact product conversion with the supplier; see Methodology & Sources.
20 kg equivalent: Estimated kilograms ÷ 20, rounded up. This is a mass comparison, not a retail pack count.
1 m³ bulk-bag equivalent: Volume ÷ 1.0, rounded up. Confirm the supplier's actual bulk-bag size.
Calculate Soil Volume From Your Measurements
Choose a shape, enter the measured dimensions and use the depth required by your project. LandscapeCalc converts the depth from millimetres and returns cubic metres without silently adding an allowance.
Separate Areas With Different Depths
If a project has shallow and deep sections, calculate them separately and add the cubic-metre results. This keeps the working visible and avoids using one average depth that hides important variation.
Soil Type Affects Only the Secondary Weight
Topsoil, garden mix, turf underlay and other products can have different bulk densities. The selected coefficient creates an indicative tonnes estimate; the cubic-metre volume remains based only on geometry. Moisture, organic content, screening and compaction can move the delivered weight materially.
Use a Supplier Specification for Ordering
Confirm the exact product, sale unit and conversion with the landscape yard. The calculator does not determine soil suitability, finished level, settlement or compaction. The Methodology & Sources page lists every coefficient and limitation.
Soil Weight Reference
See how the indicative conversion works for a one-cubic-metre starting volume.