ClarityHow to use this tool
- Enter the area in square metres and depth in metres; 10 cm is 0.1 m.
- Set the extra material allowance as a percentage.
- Calculate the base and extra volumes before checking supplier quantities.
Input reference and sample values
Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.
| Input | Format and units | Sample |
|---|---|---|
| Area to cover | Numeric value. Unit: m². Must be greater than zero. | 20 |
| Depth | Numeric value. Unit: m. Must be greater than zero. | 0.1 |
| Waste allowance | Numeric value. Unit: %. Zero or positive. Maximum: 100. | 10 |
Result for these sample inputs
2.2 m³
- Volume before allowance (m³)
- 2
- Extra allowance (m³)
- 0.2
- Total volume (litres)
- 2200
Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.
The method, explained
Volume = area × depth × (1 + waste/100).
20 m² at 0.1 m depth needs 2 m³. A 10% allowance adds 0.2 m³ for a total of 2.2 m³ (2,200 litres).
Understanding your result
The calculator returns loose volume in cubic metres. Ask your supplier whether its quoted quantity is loose or compacted and which density it uses. Moisture, grain size and compaction change the mass for the same volume.
What to keep in mind
A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.
Common questions
How many tonnes should I order?
Volume alone cannot determine mass. Ask the supplier for bulk density at the relevant moisture and compaction condition.
Can I enter centimetres in the depth field?
Convert centimetres to metres first by dividing by 100.
Methodology maintained by ClarityKit. How these tools are built and checked.