Screed calculator
Work out how much screed a floor needs, in cubic metres and bags.
Uses only the sizes you enter.
Show the workings
| Step | Sum | Answer |
|---|---|---|
| Volume | 3 m × 3 m × 0.065 m | 0.585 m³ |
| In litres | 0.585 × 1,000 | 585 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 screed
Multiply the floor's length and width, in metres, by the depth of screed, also in metres. A floor 3 m by 3 m with 65 mm (0.065 m) of screed needs 3 × 3 × 0.065 = 0.585 cubic metres.
Bagged screed says how much one bag makes. Enter that yield in litres to see the number of bags. The right depth depends on the screed and what is under it: the maker's data sheet gives it.