Formula and example
How it is calculated
Required area = area × (1 + allowance/100); rolls = round up(required area / area per roll)
Worked example
20 m² with a 10% allowance gives 22 m². At 2 m² per roll, eleven rolls are needed.
Things to check
- Actual waste depends on the shape, laying pattern and cuts. Whole rolls are always rounded up.
- Use one currency consistently. Examples use euros; the calculation works with any currency.