BuildMetricLab

Conversions & Units

Cubic Metres to Tonnes

Converts m³ to tonnes for concrete, sand, and gravel by density

Updated 26 June 2026 · Live

What this tool does

Converts m³ to tonnes for concrete, sand, and gravel by density.

Enter {cubic_metres} m³ at a density of {density_kg_m3} kg/m³ to get an estimated mass of {result}.

Inputs
m³
kg/m³
Result

1.000 m³ in Tonnes

1.600 t

Kilograms
1,600 kg
Density Used
1,600 kg/m³

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Formula Used
Mass in tonnes
Volume in cubic metres
Material density
## How the cubic metres to tonnes conversion works This calculator converts a volume in cubic metres (m³) into an estimated mass in tonnes, using the formula: mass (t) = volume (m³) × density (kg/m³) ÷ 1000. You enter the volume you need converted and the density of the material — the calculator does the rest instantly, in your browser, with no sign-up required. Density is the key variable. A cubic metre of concrete, sand, gravel, topsoil or crushed rock will each weigh a very different amount because their densities differ substantially. That is why this tool asks for a density value rather than assuming one fixed number for every material. ### Typical Australian material densities As a rough guide: general concrete mixes are often around 2,400 kg/m³, dry sand around 1,600 kg/m³, gravel and crushed rock roughly 1,500–1,800 kg/m³, and topsoil around 1,000–1,300 kg/m³ depending on moisture and compaction. These figures vary by supplier, moisture content, and how the material has been compacted or handled, so always check your supplier's product data sheet or delivery docket for the specific density of the material you are ordering. ### What this tool does not do This calculator does not know the exact density of your specific material batch, does not account for bulking or compaction differences between loose and compacted states, and does not calculate cost. It performs a single arithmetic conversion based on the volume and density you supply. For material ordering, always confirm final quantities and pricing with your supplier. ### On-site considerations When ordering bulk materials by weight (for example, a tipper load of gravel sold by the tonne) it helps to convert your required volume to tonnes first so you can compare quotes and check delivery weighbridge dockets against what you expected. Moisture content can add measurable weight to sand and aggregate, so a delivered load may weigh slightly more than a dry-density calculation suggests. ### The National Construction Code (NCC) and compliance This is a unit-conversion tool and is not a substitute for compliance checks under the National Construction Code (NCC) or any state building authority requirements. Where a material quantity relates to a structural, drainage, or fire-rated element, verify specifications with a suitably qualified professional or engineer before ordering or construction. ### Before you order Confirm the density figure from your supplier's technical data sheet rather than relying on a generic default, particularly for specialised concrete mixes, manufactured sands, or recycled aggregates, since these can differ significantly from typical values. ### Adjusting the defaults Both the volume and density fields are editable. Change the density to match your specific material, and the calculator will instantly recompute the estimated tonnage. ### Using this tool alongside other BuildMetricLab tools Combine this converter with other BuildMetricLab volume and material calculators — for example, work out the volume of concrete or aggregate you need first, then use this tool to convert that volume into an estimated tonnage for ordering or transport purposes.

Sources & methodology

Converts m³ to tonnes for concrete, sand, and gravel by density. Every result is calculated from the values you enter, and all inputs are editable.

Frequently asked questions

Are cubic metres to tonnes results accurate enough to order materials?

Use them as a starting estimate only. Verifying the final quantity with your supplier or contractor before ordering is good practice — site conditions, wastage and cut-offs all affect the true figure.

What density should I use for concrete, sand, or gravel?

Typical densities are around 2400 kg/m³ for concrete, 1600 kg/m³ for sand, and 1500-1800 kg/m³ for gravel, but these vary by mix, moisture content and compaction. Check your supplier's product data sheet for the exact density of the material you are ordering, and adjust the density field to match.

Is this a substitute for professional advice?

No. This tool is a planning estimator. For works that affect structure, the National Construction Code (NCC), boundary or dividing-fence matters, gas, electrics, drainage to a sewer, or similar, consult a suitably qualified professional.

Can I change the density value used?

Yes — the density field is fully editable. Enter the exact density from your supplier's data sheet (e.g. for a specific concrete mix, sand type, or gravel grade) to get a more accurate mass estimate than the generic default.

Spotted something off?

Calculations or display — let us know.

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