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Topsoil Calculator — Cubic Metres & Soil Weight

Estimate topsoil volume in cubic metres and mass in kilograms from area, depth and bulk density. Includes a worked example and tonnes conversion.

Editable waste and coverage assumptionsCheck supplier specifications
Project planner
Project planner

Review dimensions, coverage and waste before ordering.

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Your material estimate

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter area to cover, soil depth, bulk density.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

Input reference and sample values

Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.

InputFormat and unitsSample
Area to coverNumeric value. Unit: m². Must be greater than zero.20
Soil depthNumeric value. Unit: cm. Must be greater than zero.15
Bulk densityNumeric value. Unit: kg/m³. Must be greater than zero.1200

Result for these sample inputs

3 m³
Estimated mass (kg)
3600

Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.

The method, explained

Volume = area × depth/100. Mass = volume × bulk density.

A WORKED EXAMPLE

For 20 m² at 15 cm deep, volume is 20 × 15 ÷ 100 = 3 m³. At an entered bulk density of 1,200 kg/m³, the estimated mass is 3,600 kg, or 3.6 metric tonnes. Use the density supplied for the soil you intend to order.

Understanding your result

Volume answers how much space the layer occupies; mass answers how heavy it is under your density assumption. The default density is an editable estimate. Wet soil and compacted soil can differ substantially from a loose, dry product.

What to keep in mind

A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.

Common questions

How do I convert the soil weight to tonnes?

Divide the displayed kilograms by 1,000 to obtain metric tonnes. A metric tonne is different from a US short ton.

Does this include extra topsoil for settling?

No. It models an even layer at the dimensions you enter. Discuss settling and ordering allowances with the supplier before changing the requested quantity.

Which depth should I enter?

Enter the planned layer depth in centimetres. The calculator estimates quantity; it does not choose a suitable growing depth for your plants or project.

Methodology maintained by ClarityKit. How these tools are built and checked.