Sand and Aggregate Calculator
Enter the area, the depth and the compaction allowance.
This result is an estimate only. Double-check important figures before relying on them.
How it is calculated
- Volume = area × depth ÷ 100
- Volume to order = volume × (1 + compaction %)
- Weight = volume to order × bulk density
To size a concrete pour, use the concrete calculator.
Worked example
10 m² at 10 cm deep with a 15% allowance and 1.6 t/m³:
- Volume = 1 m³, to order 1.15 m³
- Weight = 1.84 tonnes
Why your number may differ
Moisture, grading and how well you compact the material change the volume and weight. Confirm with your supplier.
Frequently asked questions
How much sand or gravel do I need?
Multiply the area by the depth to get the volume, then add an allowance because the material compacts when laid.
How do I convert volume to weight?
Multiply the volume by the bulk density. Dry sand is about 1.6 tonnes per cubic metre, but damp sand is heavier.
Who sells it by tonne or by cubic metre?
Suppliers differ. Ask how they measure, and whether the load is delivered in tonnes or cubic metres.