m3 to Tonnes Calculator

This calculator converts between volume (cubic meters) and weight (tonnes) for construction materials. It works bidirectionally - enter either value and the other is calculated automatically.

How to Use

1. Select your material type: Choose from aggregates (sand, gravel), soils (topsoil, clay), concrete types, or asphalt. Each has a preset density.
2. Adjust for moisture: If your material is damp or wet, select the appropriate moisture state. This increases the effective density by 10-15%.
3. Adjust for compaction: If you need the compacted weight/volume, select "Compact". This increases effective density by 15%.
4. Enter volume OR weight: Type in either the volume in m3 or the weight in tonnes. The calculator instantly converts to the other unit.
5. View effective density: The results show the effective density calculation including all adjustments applied.

Common Material Densities

• Sand: 1.5 t/m3
• Gravel: 1.8 t/m3
• Crushed Stone: 1.6 t/m3
• Road Base: 2.0 t/m3
• Topsoil: 1.4 t/m3
• Clay: 1.8 t/m3
• Standard Concrete: 2.4 t/m3
• Asphalt: 2.3 t/m3

Formula

m3 to tonnes: Weight (tonnes) = Volume (m3) x Effective Density (t/m3)
Tonnes to m3: Volume (m3) = Weight (tonnes) / Effective Density (t/m3)

Effective Density = Base Density x Moisture Multiplier x Compaction Multiplier