Question 1

How do I convert m3 to tonnes?

Accepted Answer

To convert cubic meters (m3) to tonnes, multiply the volume by the material density. Formula: tonnes = m3 x density (t/m3). For example, 1 m3 of sand at 1.5 t/m3 density equals 1.5 tonnes. Our calculator includes preset densities for common construction materials.

Question 2

Why does moisture affect the weight?

Accepted Answer

Wet materials absorb water, which adds to their weight. A damp material weighs about 10% more than dry material, and wet material weighs about 15% more. This is important when ordering materials that have been stored outdoors or will be delivered in wet conditions.

Question 3

What is compaction factor?

Accepted Answer

Compaction reduces air gaps between particles, increasing the amount of material per cubic meter. Loose material has more air gaps than compacted material. A compaction factor of 1.15 means compacted material is 15% denser than loose material. This affects both volume-to-weight and weight-to-volume calculations.

Question 4

How accurate is this calculator?

Accepted Answer

The calculator uses typical material densities and is accurate to within 5-10% for most applications. Actual density varies based on moisture content, particle size, compaction, and material source. For critical applications, request the specific density from your supplier.

Question 5

What density should I use for mixed materials?

Accepted Answer

For mixed materials, use a weighted average density based on the proportions. Alternatively, select the closest single material match. You can also use the custom density option if you know the specific density of your mix.

Question 6

Can I use this for any material?

Accepted Answer

Yes! While we provide preset densities for common construction materials (sand, gravel, concrete, soil, asphalt), you can enter any custom density between 0.1 and 10 t/m3. This makes the calculator useful for any material where you know the density.

m3 to Tonnes Calculator

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