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Vinyl Plank Flooring Calculator

Enter the room size, waste percentage, and box coverage to get the boxes needed.

How it is calculated

The tool works for one rectangular room in feet. area = length × width, then needed = area × (1 + waste ÷ 100), and boxes = ceil(needed ÷ box coverage). Box coverage is the square feet printed on one carton. Waste is a percentage and defaults to 0 if you leave it empty, so you must add the allowance yourself. It also reports the square feet you actually buy, boxes × box coverage. Length, width and box coverage must be greater than zero and waste cannot be negative. The tool does not subtract closets or cabinets, handle L-shaped rooms (split them into rectangles and add the areas) or recommend a waste percentage for your layout.

Worked example

A room is 14 ft × 12 ft with 10% waste, and each box covers 23.64 sq ft. Area: 14 × 12 = 168.00 sq ft. With waste: 168 × 1.10 = 184.8 sq ft. Boxes: 184.8 ÷ 23.64 = 7.82, rounded up to 8. Result: 8 boxes, which is 8 × 23.64 = 189.12 sq ft purchased, about 4.3 sq ft more than the 184.8 needed.

Try this example →

Common mistakes

  • Leaving the waste field empty. Without it the tool uses 0%, which gives the bare floor area and no spare planks for cuts and bad pieces.
  • Entering the room in metres or the box coverage in square metres. Both inputs are in feet and square feet, so convert first.
  • Entering the waste as 0.10 instead of 10. The field is in percent, so 0.10 means one tenth of one percent.
  • Using the same waste for every layout. A diagonal or herringbone install, or a room with many doorways and cabinets, needs a higher allowance than a plain rectangle.
  • Measuring an L-shaped room as one rectangle of its longest sides. Split it into rectangles and add them up, since the full bounding box overstates the area.

About this calculator

This calculator divides your room's floor area by the coverage a single box of vinyl plank flooring provides (printed on the box, commonly 20–30 sq ft per box depending on brand and plank size), then adds a waste allowance — typically 5–10% for a straight layout, up from there for diagonal installs or rooms with lots of cuts around cabinets and doorways — before rounding up to a whole number of boxes, since a partial box can't be purchased.

DIY homeowners and flooring installers use this before placing an order because underestimating means an expensive, sometimes impossible mid-project run back to the store to match a dye lot that may already be discontinued, while overestimating wastes money on unopened boxes. Getting the waste percentage right for the specific room layout — a simple rectangular room needs far less allowance than one with bay windows, closets, or a herringbone pattern — is what separates a good estimate from a rough guess.

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Comments (1)

  • Editorial team

    Take a 12 by 10 ft room with 10 percent waste and 23.64 sq ft boxes: the area is 120.00 sq ft, the tool asks for 6 boxes and you end up holding 141.84 sq ft. Buy every box in one order so they share a production batch, since colour can drift between runs, and keep the unopened spare for later repairs. Which layout, straight or diagonal, did you plan, and what waste allowance did you settle on?

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