Flooring Calculator
Calculate floor area, the number of flooring boxes and the cost, including a waste allowance.
About the Flooring Calculator
Enter the room's length and width, a waste allowance, the coverage printed on each box and the price per box. The calculator gives the floor area, how many boxes to buy and the cost.
Add a waste allowance for cuts: around 10% for straight laying and 15% or more for diagonal or patterned layouts such as herringbone. Divide by the coverage per box and round up.
The formula
Boxes = ⌈L × W × (1 + waste) ÷ coverage per box⌉
Worked example
A 5 × 4 m room, 10% waste, 2.2 m² per box at 45
- Floor area: 20 m²
- With waste: 22 m², so 22 ÷ 2.2 = 10 boxes
- Cost: 10 × 45 = 450
Things to keep in mind
- Split L-shaped rooms into rectangles and add the areas.
- Underlay, trims and adhesive are bought separately.
Questions people ask
Do I measure into doorways?
Yes, measure to the middle of the door threshold.
Should I keep spare boxes?
One spare box helps with future repairs from the same batch.
Should flooring acclimatise?
Wood and laminate usually need 48 hours in the room before laying; check the manufacturer's instructions.