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