How the gravel calculation works
Volume = length × width × depth in metres. Estimated weight = volume × density.
Worked example
A 6 m × 3 m area at 10 cm depth is 1.8 m³. At 1.6 t/m³, the estimated weight is about 2.88 tonnes.
Guide: using this calculator accurately
For the full explanation, worked examples, measurement tips and FAQs, read the Gravel Guide →.
How to measure an area for gravel
Measure the length and width of the area and decide the finished gravel depth. For driveways or paths with changing widths, split the project into manageable sections.
Why gravel depth matters
Depth determines how much material is required. The right depth depends on the application, base preparation, aggregate size and local construction practice.
Understanding gravel density
A cubic metre is a volume, not a fixed weight. Different aggregates have different bulk densities, and moisture and compaction can change the actual delivered weight.
Ordering gravel by tonne or cubic metre
Some suppliers sell aggregate by weight and others by volume. Use the supplier's stated density or conversion factor instead of assuming one density fits every gravel product.
Common gravel-calculation mistakes
Do not treat loose gravel as having the same density as compacted gravel. Also avoid using a very thin depth simply because it reduces the order quantity; the finished application needs an appropriate layer.
Frequently asked questions
Is the gravel weight exact?
No. It is an estimate based on the density you enter. Ask the supplier for the product's typical bulk density.
How much gravel do I need for a driveway?
The calculator can estimate volume and weight, but driveway construction also depends on excavation, sub-base, drainage, aggregate type and required thickness.
Can I calculate several sections?
Yes. Calculate each rectangular section and add the volumes or weights.