How the calculation works
The formulas
Enter measured net room areas and the coverage printed on one pack. Waste is applied before rounding up to whole packs; surplus compares purchased coverage with net floor area.
Required area = Σ(room areas) × (1 + waste/100)
Packs = ceil(required area ÷ pack coverage)
Surplus = packs × pack coverage − net area
Assumptions to check
- This is an area allowance, not a plank-by-plank cutting or pattern plan.
- Pack coverage and prices are user inputs, not live product data.
A worked example
20 m² plus 10% waste is 22 m². At 2.2 m² per pack, buy 10 packs; surplus over the net floor is 2 m².