Aggregate calculator
Work out how much aggregate you need for an area: any kind, at any depth.
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 to work out aggregate
Area times depth gives the volume: multiply the length and width, in metres, by the depth, in metres. Then use your supplier's weight for a cubic metre to turn it into tonnes. Different aggregates weigh different amounts, so we do not guess.