Sand calculator
Work out how much sand you need, in cubic metres, tonnes and bags.
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 sand do I need?
Multiply the length and width, in metres, by the depth, in metres. A sandpit 2 m by 1.5 m filled 300 mm deep needs 2 × 1.5 × 0.3 = 0.9 cubic metres.
Sand is sold by the tonne and in bags. Its weight depends on the sand and how wet it is, so enter your supplier's figure for the weight of a cubic metre to see tonnes.