Construction/Home calculator
Topsoil Calculator - Volume, Tonnes and Cost
Estimate topsoil volume, tonnes, and cost for lawns, beds, or landscaping areas from area dimensions, depth, density, and waste.
FormulaTopsoil tonnes = length x width x depth(m) x density kg/m3 x (1 + waste %) / 1000
Formula
Topsoil quantity estimate
Topsoil weight varies strongly with moisture and composition. Confirm bag, bulk, or truckload conversions with the supplier.
Topsoil tonnes = length x width x depth(m) x density kg/m3 x (1 + waste %) / 1000
5 m x 4 m at 15 cm, 10% waste, and 1,200 kg/m3 gives about 3.96 tonnes.
SourcesThis calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
Sources and assumptions
Source notes
This calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
- Effective year
- Current rules
- Last verified
- 2026-06-18
Topsoil weight varies strongly with moisture and composition. Confirm bag, bulk, or truckload conversions with the supplier.
Assumptions
- Length and width are entered in meters, depth in centimeters.
- Density is editable because dry and wet topsoil can differ significantly.
- Waste covers settlement, spreading loss, and measurement buffer.
Not included
- Soil testing, compost blending, compaction, drainage, bulk bag sizing, delivery rounding, labor, and plant-specific growing requirements.
FAQ6 common questions for this calculator.
FAQs
How deep should topsoil be?+
Depth depends on the project. Lawns, raised beds, and leveling work may require different depths.
Why does wet topsoil weigh more?+
Moisture adds weight without changing the measured area, so tonnes can increase for the same volume.
How does the Topsoil Calculator calculate the result?+
For the Topsoil Calculator, it uses the Topsoil quantity estimate: Topsoil tonnes = length x width x depth(m) x density kg/m3 x (1 + waste %) / 1000. 5 m x 4 m at 15 cm, 10% waste, and 1,200 kg/m3 gives about 3.96 tonnes.
What information do I need to use the Topsoil Calculator?+
For the Topsoil Calculator, enter area dimensions, depth, density, and waste. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.
How accurate is the Topsoil Calculator?+
Topsoil Calculator is a material estimate based on the dimensions, unit system, and allowance values entered. It uses the Topsoil quantity estimate, but cuts, openings, site conditions, pack sizes, and code requirements can change the final quantity.
What should I check before using the Topsoil Calculator result?+
For the Topsoil Calculator, check area dimensions, depth, density, and waste, unit system, waste allowance, openings, site conditions, and supplier pack size. Use the estimate as a planning quantity before ordering materials.
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Construction/Home guide
How to use the Topsoil Calculator
Estimate topsoil volume, tonnes, and cost for lawns, beds, or landscaping areas from area dimensions, depth, density, and waste. The page also explains the topsoil quantity estimate and shows a practical example: 5 m x 4 m at 15 cm, 10% waste, and 1,200 kg/m3 gives about 3.96 tonnes.
- 1
Enter your details
Enter area dimensions, depth, density, and waste, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the topsoil quantity estimate: Topsoil tonnes = length x width x depth(m) x density kg/m3 x (1 + waste %) / 1000.
- 3
Compare scenarios
Change one or more inputs to see how they affect the topsoil Calculator result before you use the estimate.