Gravel calculator
Work out how much gravel you need for a path, drive or border.
Uses only the sizes you enter.
Show the workings
| Step | Sum | Answer |
|---|---|---|
| Volume | 20 m² × 0.05 m deep | 1 m³ |
| In litres | 1 × 1,000 | 1,000 litres |
Where the figures come from
- Litres in a cubic metre: 1,000 litres per m3. Source: Weights and Measures Act 1985, Schedule 1. Checked 13 November 2026.
How much gravel do I need?
Multiply the length and width of the area, in metres, by the depth, also in metres. A path 5 m by 1 m covered 50 mm (0.05 m) deep needs 5 × 1 × 0.05 = 0.25 cubic metres.
Why we ask for the weight
Gravel is often sold by the tonne or in bulk bags filled by weight. How much a cubic metre weighs depends on the stone, its size and how wet it is, so we do not guess. Ask your supplier for the weight of a cubic metre and enter it to see tonnes and bags.