Soil Calculator
Length (m)
Width (m)
Depth (cm)
A soil volume calculator determines how much topsoil, compost, or mulch to order for a garden area at a target depth, converting to bags or tonnes for purchasing.
- 1Volume = Length × Width × Depth (all metres)
- 2Litres = m³ × 1,000
- 3Tonnes ≈ m³ × bulk density (topsoil ~1.1 t/m³)
- 4Add 10% for settling and wastage
4m × 3m bed, 25cm deep=Volume = 3 m³ = 3,000 L; Weight ≈ 3.3t ≈ 75 × 40L bags
| Soil type | Density (kg/m³) |
|---|---|
| Topsoil (moist) | ~1,100 |
| Garden compost | ~600–800 |
| Sandy soil | ~1,400–1,600 |
| Clay soil | ~1,200–1,500 |
| Potting mix | ~500–700 |
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