Find the box coverage
Read how much area one box of your chosen format covers. Do not enter the size of one piece or the number of pieces. When changing format, check coverage again even if the product name looks similar.
A 5 × 4 m floor has an area of 20 m². With a 10% allowance, the target is 22 m². At 1.8 m² per box, dividing 22 by 1.8 gives approximately 12.22 boxes.
Always round the required boxes up
You need 13 whole boxes to reach that target. Together they contain 13 × 1.8 = 23.4 m². Buying 12 boxes would provide only 21.6 m², which is below the planned 22 m² target.
The 1.4 m² between the target and purchased area comes from rounding. It is separate from the original 2 m² allowance. Seeing both explains why the purchased area is greater than the measured floor area.
Compare prices using matching units
Enter the price of one box to estimate the flooring cost. In this example, that price is multiplied by 13. Do not enter a price per square metre into a field that expects a price per box.
Before paying, check the product reference, selling conditions and additional materials required. The calculator does not confirm stock or returns policies. Keep your measured area, allowance and box coverage so you can repeat the calculation if the product changes.
- Check the unit printed alongside the price.
- Use coverage for the exact product format.
- Compare purchased area as well as the number of boxes.
Frequently asked questions
Does a bigger box mean a lower cost?
Not necessarily. You need each box price and the whole number required. The amount left over after rounding can also differ.
Can I add several rooms together?
Yes, when they use the same product and allowance approach. Check the cutting plan first: adding areas does not guarantee that all offcuts can be reused.