Flooring Calculator
sq ft
10%
sq ft
sq ft
$
Boxes Needed7
Area With Waste132 sq ft
Approx. Planks70
Total Cost$280.00
Laminate, engineered hardwood, and vinyl plank flooring are sold by the box, so the real question when ordering is how many full boxes to buy. This calculator takes the room area in square feet, adds a waste allowance for cuts and mistakes, divides by the coverage printed on each box, and rounds up to whole boxes — then estimates plank count and total cost.
Formula
boxes = ceil(area × (1 + waste/100) / sqftPerBox); cost = boxes × pricePerBox
- area
- Room floor area in square feet
- waste
- Waste allowance percentage for cuts and breakage
- sqftPerBox
- Coverage of one box in square feet
- pricePerBox
- Price of one box in dollars
How it works
- Enter the room area in square feet (length times width) and a waste percentage that covers offcuts, pattern matching, and the occasional damaged plank.
- Enter the square feet each box covers; the calculator inflates the area by the waste factor and divides by the box coverage, always rounding up to a whole box.
- Optionally enter the coverage of a single plank and a price per box to see the approximate plank count and the total flooring cost.
Worked example
A 120 sq ft room with a 10% waste allowance, flooring sold in boxes that cover 20 sq ft at $40 per box.
- Area with waste = 120 × (1 + 10 ÷ 100) = 132 sq ft.
- Boxes = ceil(132 ÷ 20) = ceil(6.6) = 7 boxes.
- Total cost = 7 × $40 = $280.00.
You need 7 boxes, covering the 132 sq ft with waste, for about $280.00.
Frequently asked questions
- How much waste should I add for flooring?
- A 5% to 10% allowance is typical for straight rooms; use 10% to 15% for diagonal layouts, busy patterns, or rooms with many corners and obstacles that force more cuts.
- Why does the calculator always round up to whole boxes?
- Flooring is sold only in full, sealed boxes. Even if you need a fraction of a box, you must buy the whole box, so the result is rounded up to the next whole number.
- How does this differ from a tile calculator?
- A tile calculator counts individual tiles and accounts for grout gaps, while a flooring calculator works in boxes of planks sold by square-foot coverage and uses a waste percentage instead of a grout spacing.
- Should I keep any leftover flooring?
- Yes. Keeping at least one extra board or part of a box is wise so you can replace a damaged plank later with material from the same dye lot, which is hard to match afterward.