Flooring Calculator
Boxes of laminate, luxury vinyl or hardwood for a room, figured with the waste allowance your layout actually needs. Enter the room, the coverage printed on the box, and the pattern you are laying. Results update as you type.
Your flooring
Buy all boxes from the same production run (check the lot or dye lot number on the box) so colour and sheen match across the floor.
Worked example
A 5 m by 4 m room, boxes of 2.5 m², straight lay
Room area: 5 × 4 = 20 m². With 10 percent waste: 20 × 1.10 = 22 m² to cover.
Boxes: 22 ÷ 2.5 = 8.8, rounded up to 9 boxes, which cover 9 × 2.5 = 22.5 m². These are the default results above.
Laying the same room diagonally at 15 percent waste: 20 × 1.15 = 23 m², 23 ÷ 2.5 = 9.2, so 10 boxes covering 25 m².
How this calculator works
The math is boxes = room area × (1 + waste) ÷ coverage per box, rounded up to the next whole box, because flooring is only sold by the full box. The area those boxes cover is the box count times the coverage per box, which shows your true leftover for closets, future repairs and mistakes.
Waste is not padding for its own sake. Every row ends in a cut, boards with defects get culled, and angled patterns cut far more off-cuts that cannot be reused. Straight layouts waste about 10 percent, diagonal about 15 percent, and herringbone about 20 percent because nearly every piece is cut at an angle. Rooms with many alcoves, fireplaces or angled walls waste more than a plain rectangle at the same pattern; measure those as separate rectangles and add the areas, or raise the waste figure.
Common questions
How do I measure a room that is not a rectangle?
Break it into rectangles, measure each one, and add the areas. An L-shaped room is two rectangles. Enter the total area by using one rectangle with the same total (for example, enter a length and width that multiply to your total), or run the calculator once per section and add the box counts, rounding up once at the end rather than per section so you do not overbuy.
Why does the box coverage on the box look different from the store sign?
Trust the box. Coverage per box changes between product lines and even between colours in the same line, and shelf signage is often for a different size. Enter the square metres printed on the exact product you are buying.
Should I buy an extra box beyond the result?
Keeping one spare box is cheap insurance for future repairs, since a product line can be discontinued and a later batch will not match exactly. The calculator result already includes waste for installation; the spare box is for the years after, and many stores accept returns of unopened boxes if you decide against it.
Does underlay change the amount of flooring I need?
No, the flooring quantity is the same, but underlay is bought separately, usually in rolls covering 10 to 20 m² each. Divide your room area by the roll coverage and round up. Some vinyl and laminate products have underlay attached; check the box before buying rolls you do not need.
Estimates only, verify before you buy materials. Acclimatize flooring in the room before installing and follow the manufacturer instructions for expansion gaps, moisture and subfloor preparation.