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Laminate Flooring Calculator

Enter the room size, box coverage, and waste percentage to size your laminate order.

How it is calculated

The tool works out how many full boxes cover the room including a waste allowance: area = length × width, needed = area × (1 + waste ÷ 100) and boxes = ⌈needed ÷ box coverage⌉. Length and width are in feet, the coverage printed on one box is in square feet and waste is a percentage. It also shows the floor area and the area you actually buy, boxes × box coverage. All fields must be filled: leaving the waste field empty gives no result, so type 0 if you want none. Length, width and coverage must be above zero. The tool treats the room as one rectangle, so L-shaped or alcove rooms should be calculated in parts.

Worked example

A room 14 ft by 12 ft with boxes covering 20 sq ft and 10% waste. Area: 14 × 12 = 168.00 sq ft. With waste: 168 × 1.10 = 184.8 sq ft. Boxes: 184.8 ÷ 20 = 9.24, rounded up to 10 boxes. You buy 10 × 20 = 200.00 sq ft, which leaves 32 sq ft above the room area for cuts and spares.

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Common mistakes

  • Using the box price or the number of planks instead of the coverage in square feet printed on the box. The coverage per box differs by product.
  • Measuring in metres or inches. The tool expects feet, so a 4.2 m wall must be entered as about 13.8.
  • Leaving waste empty or at 0. Cuts at walls and the end pieces of rows are always lost, so 0% undersells the order; 5 to 10% is a common choice for simple rooms.
  • Calculating a room with closets, alcoves or an L-shape as one rectangle. Split it into rectangles, calculate each and add the boxes, or measure the full bounding area.
  • Rounding the box count down. Since the tool rounds up, trust its box count rather than a rounded-down number from the area figure.

About this calculator

This calculator finds the floor area of your room (length × width), adds a waste allowance to cover cuts, staggered seams, and mistakes — typically 5-10% for a simple rectangular room, more for rooms with alcoves, diagonal layouts, or lots of doorways — then divides by the coverage area printed on each box of laminate and rounds up to the number of full boxes you need to buy.

DIY homeowners and flooring contractors use this to order the right quantity before starting a job: under-ordering risks a mismatched dye lot if you have to buy more later, since laminate batches vary slightly in color and pattern between production runs, while over-ordering wastes money on boxes that often aren't returnable once opened. Rounding up to full boxes, rather than exact square footage, reflects how laminate is actually sold at retail.

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  • Editorial team

    Rounding happens per run, so splitting a layout into parts and adding the box counts can order more than you need. Two identical 14 by 12 ft rooms at 20 sq ft a box and 10 percent waste give 10 boxes each, 20 in total. If the same laminate runs through both, add the areas first, type 336 as the length and 1 as the width, and you get 19. Do you lay it as one run, or room by room?

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