Formula and example
How it is calculated
Volume = length × width × thickness/100 × (1 + allowance/100), with thickness in centimetres
Worked example
5 m × 4 m × 0.15 m gives 3 m³. A 5% allowance increases this to 3.15 m³.
Things to check
- This calculates quantities only. Load capacity, reinforcement, ground conditions and the required concrete specification need separate planning.
- Use one currency consistently. Examples use euros; the calculation works with any currency.