Cubic Metres to Tonnes Ballast Converter
Instantly calculate the weight of concrete ballast, gravel, and aggregate in metric tonnes based on volume in cubic metres. Accurate for construction, driveways, and landscaping projects.
Calculate Your Ballast Weight
Enter the volume of ballast or aggregate in cubic metres and select the material type below to get an instant, accurate conversion to metric tonnes.
Weight Converter
Enter your volume to see the estimated weight in tonnes
Calculate volume: Length (m) × Width (m) × Depth (m)
Density varies based on aggregate size, moisture, and compaction
Estimated Weight
Converted based on standard material densities
Ballast Density Reference Chart
Standard average densities for different types of ballast and construction aggregate. Use this to verify your manual calculations or adjust the estimator above.
| Aggregate Type | Density (Tonnes/m³) | Density (kg/m³) | Common Use |
|---|---|---|---|
| Standard Ballast (Gravel/Sand Mix) | 1.60 | 1,600 | General concrete mixing, foundations |
| Concrete Ballast (All-in) | 1.75 | 1,750 | Heavy-duty concrete, structural slabs |
| Pea Gravel / 10mm Gravel | 1.50 | 1,500 | Decorative landscaping, drainage, pathways |
| Sharp Sand / Grit Sand | 1.60 | 1,600 | Mortar mixing, paving bases, bedding |
| MOT Type 1 Aggregate | 2.00 | 2,000 | Sub-bases for driveways, roads, patios |
Ballast Weight FAQ
Everything you need to know about converting ballast and aggregate volume to weight for your construction or landscaping project.
On average, one cubic metre of standard ballast weighs between 1.50 and 1.75 metric tonnes. Concrete all-in ballast is typically around 1.75 t/m³, while lighter gravels like pea gravel are around 1.50 t/m³.
Yes. Aggregate and ballast can absorb and retain moisture. Wet ballast can weigh 5% to 15% more than dry, loose ballast depending on the saturation level and the proportion of sand in the mix.
To calculate the volume in cubic metres (m³), measure the length, width, and desired depth of the area in metres, then multiply them together: Volume = Length × Width × Depth. For example, a driveway area 5m long, 3m wide, and 0.05m (5cm) deep requires 0.75 m³ of ballast.
Coverage depends on the depth and type. At a standard depth of 50mm (0.05m), 1 tonne of standard ballast (approx. 1.60 t/m³) will cover approximately 12.5 square metres. MOT Type 1 aggregate will cover slightly less area per tonne due to its higher density.