Laminate Flooring Calculator

Quickly estimate boxes, waste, rows, last-row width, and underlayment rolls for your room.

Fast estimate: enter room size, box coverage, and pattern. For L-shaped rooms, obstructions, metric, plank layout, or underlayment settings, open Advanced.

Quick Estimate (4 Fields)

Tip: box coverage is printed on the carton (ft² or m²).

Pattern sets a recommended waste % (editable in Advanced).

Advanced (optional)

Default is U.S. feet/inches. Switching updates labels and calculations.

Typical: 10% straight • 12–15% diagonal • 18–20% herringbone

Tip: Only add Room 2 if it does not overlap Room 1.

Obstructions (optional)

Areas you won’t cover, like a fireplace hearth or island.

Plank Details (for rows / last-row width)

Layout Preferences

Typical: 3/8″ around perimeter.

Underlayment

Layout Preview

Shaded stripes represent plank rows across the installation width. Arrow shows plank orientation.

Laminate Flooring Calculator — Boxes, Waste & Underlayment in Minutes

Use this free Laminate Flooring Calculator to estimate how many boxes of laminate to buy, how much waste to allow, and how many underlayment rolls you’ll need. Enter your room size (add a second rectangle if your space is L-shaped), subtract any obstructions, choose your plank size and box coverage, and the calculator instantly returns a purchase-ready tally.

How the Calculator Works

  1. Measure the room: Use length × width. For complex spaces, split into rectangles and add them together.
  2. Account for obstructions: Subtract areas you won’t cover (islands, hearths, closets).
  3. Pick your plank and box: Enter plank length/width and coverage per box (ft² or m²).
  4. Choose a waste percentage: 10% for straight runs; 12–15% for diagonal; 18–20% for herringbone or lots of corners.
  5. Review layout basics: The tool estimates rows, last-row width, and underlayment rolls.

FAQs

How many boxes of laminate do I need?
Enter your room size, plank size, box coverage, and waste percentage. The calculator multiplies net area by your waste, then divides by coverage per box and rounds up.

What waste percentage should I use?
10% works for most straight layouts. For diagonal installs use 12–15%, and for herringbone 18–20%. Complex rooms with lots of corners may also need more.

Do I need a moisture barrier?
On concrete slabs, a vapor/moisture barrier is recommended, even if your laminate has an attached pad. Check the flooring manufacturer’s instructions.

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Important Estimate Disclaimer

Results are provided for general planning and budgeting purposes only. Actual coverage may vary based on surface condition, layout complexity, waste allowance, and product specifications.

Refer to our Methodology and Data Sources for calculation assumptions.

Surface preparation, substrate irregularities, and installation methods may increase required material quantities.