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Flooring Calculator

Find flooring boxes and cost.

Result

How it is calculated

boxes = ceil(area × 1.1 / coverage per box) and cost = boxes × price per box. The 1.1 adds a fixed 10% allowance for cuts and waste. Rounding up to a whole box is needed because boxes are sold sealed. The area and the coverage per box must be in the same unit, such as m² or sq ft, and the answer is in whole boxes.

You enter the floor area itself, not the room's length and width, so multiply them first. The coverage per box must be above zero and the area cannot be negative. The 10% is fixed and cannot be changed, so diagonal layouts, patterned boards or very awkward rooms may need more. Cost is only the flooring, with no underlay, trim, adhesive or delivery.

Worked example

A room is 18.5 m², each box covers 2.2 m² and costs $45. With the waste allowance, the area to buy is 18.5 × 1.1 = 20.35 m². Boxes = 20.35 / 2.2 = 9.25, rounded up to 10 boxes. Cost = 10 × 45 = $450.00. Those 10 boxes cover 22 m², so there is some left for repairs.

Try this example →

Common mistakes

  • Entering the room's length or perimeter instead of its area: the field expects the area, for example 4.5 m × 4.1 m is 18.45 m².
  • Mixing units, such as a room in square feet and a box coverage in square metres: both must use the same unit.
  • Adding your own waste on top of the 10% already included, which orders about 10% more than needed.
  • Not removing areas you will not floor: the whole area you enter is treated as flooring, so fitted kitchen cabinets or a built-in bath should be taken out first.

About this calculator

This calculator turns a floor area into the number of flooring boxes you need to buy and the total cost. You enter the area, the coverage per box and the price per box, and it adds a fixed 10% waste allowance for cuts and offcuts. For a room, multiply length by width first.

DIYers planning a laminate, vinyl, or hardwood install use it to avoid a second trip to the store for one extra box, and contractors use it to quote material costs quickly before a job. It works whatever the box coverage or price per box happens to be for the product you've chosen.

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Comments (1)

  • Editorial team

    When comparing products, price per box can mislead. Work out price divided by coverage, then run each product, because whole-box rounding changes the totals. For 18.5 m², a 2.2 m² box at 45 costs 450, while a 1.8 m² box at 38 costs 456, a narrower gap than the 3% per-m² difference. Which flooring type are you pricing?

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