How to Calculate Soil

What is Soil?

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.

Formula

Soil volume = Area × Depth | Soil weight = Volume × Density | Amendment ratio based on soil test recommendations

Step-by-Step Guide

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

Worked Examples

Input

4m × 3m bed, 25cm deep

Result

Volume = 3 m³ = 3,000 L; Weight ≈ 3.3t ≈ 75 × 40L bags

Frequently Asked Questions

What is Soil Volume?

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. Use this calculator for accurate, instant results.

How accurate is the Soil Volume calculator?

The calculator uses the standard published formula for soil volume. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Soil Volume calculator use?

This calculator works with inches, percentages, watts. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Soil Volume calculator use?

The core formula is: Volume = Length × Width × Depth (all metres). Each step in the calculation is shown so you can verify the result manually.

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