Question 1

How do I convert m3 to tonnes?

Accepted Answer

Multiply cubic meters by density in tonnes per cubic meter. Formula: tonnes = m3 x density (t/m3). The calculator returns metric tonnes, not US short tons.

Question 2

How many tonnes is 1 m3 of gravel?

Accepted Answer

Using the gravel preset density of 1.8 t/m3, 1 m3 x 1.8 = 1.8 metric tonnes before moisture or compaction adjustments.

Question 3

How do I convert soil m3 to tonnes?

Accepted Answer

For topsoil, use 1.4 t/m3. Formula: soil tonnes = m3 x 1.4, so 10 m3 of topsoil is about 14.0 metric tonnes before moisture changes.

Question 4

How many tonnes is asphalt per m3?

Accepted Answer

Asphalt uses a density of 2.3 t/m3. Formula: asphalt tonnes = m3 x 2.3, so 1 m3 is about 2.3 metric tonnes.

Question 5

How many tons is a cubic meter of road base?

Accepted Answer

Road base uses 2.0 t/m3, so 1 m3 x 2.0 = 2.0 metric tonnes. If you need US short tons, 2.0 metric tonnes is about 2.20 US short tons.

Question 6

How do I convert stone m3 to tonnes?

Accepted Answer

Use the crushed stone density of 1.6 t/m3. Formula: stone tonnes = m3 x 1.6, so 5 m3 of crushed stone is about 8.0 metric tonnes.

Question 7

How many tonnes is 1 m3 of concrete?

Accepted Answer

Standard concrete uses 2.4 t/m3. Formula: concrete tonnes = m3 x 2.4, so 1 m3 is about 2.4 metric tonnes.

Question 8

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 9

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 10

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 11

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 12

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.

Material	kg/m³	lb/ft³	Notes
Dry sand	1,500	94	Clean dry sand; damp sand can be noticeably heavier.
Gravel	1,800	112	Typical loose aggregate for drainage, base, and backfill.
Crushed stone	1,600	100	Angular aggregate; density varies by stone type and grading.
Road base	2,000	125	Dense graded base with fines, usually heavier than clean gravel.
Topsoil	1,400	87	Loose screened soil; organic content and moisture change weight.
Clay soil	1,800	112	Can become much heavier when wet and difficult to compact uniformly.
Standard concrete	2,400	150	Typical normal-weight concrete, not lightweight concrete.
Asphalt	2,300	144	Compacted asphalt mix for pavement estimating and haul checks.

m3 to Tonnes Calculator

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