Laminate Flooring Calculator: Planks, Boxes and Cost by Room Size

1. Enter the room length and width in feet, or type a custom area in square feet for irregular rooms.
2. Set the plank size in inches. The default 48 x 5 inches is the most common laminate plank.
3. Confirm planks per box from the product label (default 8).
4. Set a waste allowance. 10 percent is standard; use 15 percent for diagonal installs.
5. Enter the number of doorways to get a transition strip count.
6. Choose whether to include underlayment area (calculated with 10 percent overlap).
7. Optionally enter a cost per square foot for a material estimate.

A laminate flooring calculator turns your room measurements and plank dimensions into a shopping list: how many planks, how many boxes, and how much underlayment you need. It adds a waste factor for cuts and fitting and gives a cost estimate when you enter a price.

Buying the right amount of laminate avoids two problems. Too little means a second trip to the store and a possible dye-lot mismatch. Too much wastes money. The calculator hits the middle ground by including a sensible waste percentage.

For other flooring and construction estimates, see the construction calculators hub.

The calculator uses straightforward area geometry. Every step is shown so you can verify it by hand.

1. Multiply room length by width to get the floor area in square feet.
2. Convert each plank's length and width from inches to square feet by dividing by 144.
3. Divide the room area by the plank area and multiply by the waste factor.
4. Round up to the next whole plank, then round up again to full boxes.

Why Round Up Twice?

You cannot buy a fraction of a plank, so the plank count is rounded up first. Boxes contain a fixed number of planks, so you round up to full boxes. The extra planks in the last box serve as spares.

Room: 12 x 10 feet. Planks: 48 x 5 inches, 8 per box, 10 percent waste.

Step 1 - Room area: 12 x 10 = 120 sq ft.

Step 2 - Plank area: 48 x 5 = 240 sq in / 144 = 1.6667 sq ft per plank.

Step 3 - Planks with waste: 120 / 1.6667 x 1.10 = 79.2, rounded up = 80 planks.

Step 4 - Boxes: 80 / 8 = 10 boxes.

Underlayment: 120 x 1.10 = 132 sq ft (with a 10 percent planning allowance).

Cost at $2.50 per sq ft (an example price): 10 boxes x 8 planks x 1.6667 = 133.33 sq ft bought, so 133.33 x 2.50 = $333.33. Pricing only the 120 sq ft room would say $300 and miss the extra planks you must buy.

As a second check: a 15 x 14 foot room with 48 x 7 inch planks (2.3333 sq ft each), 10 percent waste and 10 per box gives 210 / 2.3333 x 1.10 = 99 planks in 10 boxes.

Laminate planks come in several widths and lengths. The table below lists the most common options. All sizes are adjustable in the calculator.

Always check the product label for exact plank dimensions and the number of planks per box. Sizes can vary slightly between brands.

Several factors change how many planks and boxes you need beyond the raw area calculation.

Layout Pattern and Waste

One manufacturer installation guide (Pergo) says to add 10 percent for a standard installation and 15 percent for a diagonal one. Herringbone or chevron patterns need angled cuts on every plank and may need more, so ask your manufacturer.

Room Shape

L-shaped rooms, alcoves and bay windows force extra cuts at each corner. Use a higher waste percentage for complex outlines, starting at 15 percent.

Plank Width

Wider planks cover more area per piece, so you need fewer total planks. However, wide planks may produce more off-cut waste in narrow hallways.

Underlayment Choice

Foam underlayment is standard for wood subfloors. Cork adds sound insulation for upper floors. A vapor barrier layer is essential over concrete. The calculator adds a 10 percent planning allowance for overlap and trimming; check your product guide, because some films specify an overlap at the seams.

Subfloor Condition

The subfloor must be level within 3/16 inch over 10 feet. Sand high spots and fill low spots before laying underlayment. An uneven subfloor causes planks to gap, creak or unlock over time.

Laminate is one of several floating-floor options. The table compares typical installed costs so you can budget accurately.

All prices are example ranges (2025 US averages) and vary by brand, region and installer. Enter your actual price per square foot in the calculator for a project-specific estimate. For vinyl plank estimates, try the vinyl flooring calculator.

Before Buying Materials

Run the calculator before you visit the store. Knowing the exact plank and box count prevents under-buying (which risks a dye-lot mismatch on a return trip) and over-buying (which wastes money).

Comparing Plank Sizes

Try different plank widths to see how the box count changes. Wider planks mean fewer pieces but may cost more per square foot.

Budgeting a Project

Enter the cost per square foot to get a material total. Add labour and accessories separately for a full budget. For tile or carpet alternatives, see the tile calculator or carpet calculator.

Planning Complex Layouts

Increase the waste percentage for diagonal or herringbone patterns, then check the underlayment and transition strip counts to complete the shopping list.

1. Forgetting the Waste Allowance

Buying exactly the room area leaves no margin for cuts, fitting or damaged planks. Always add at least 10 percent.

2. Using the Wrong Plank Dimensions

Plank sizes vary between brands. Entering the wrong length or width throws off the whole estimate. Check the product label.

3. Ignoring Box Rounding

You buy full boxes, not individual planks. Rounding up to the next box is not wasted money; the extra planks serve as spares for future repairs.

4. Skipping Underlayment

Most laminate requires underlayment. Forgetting it means a second trip and possibly a squeaky or uneven floor.

5. Measuring Once

Measure the room at least twice, in slightly different spots, and use the larger figure. Walls are rarely perfectly straight.

Two installation details do not change the material quantity but are critical for a lasting floor.

Expansion Gap (check Your Guide)

Laminate expands and contracts with temperature and humidity. Leave the gap your installation guide specifies between the flooring and every wall, door frame, pipe and fixed object. Two revisions of one manufacturer guide (Pergo) list 3/8 inch and 1/4 inch, and Wikipedia gives a general range of 1 to 10 mm, so use the number printed with your flooring. Baseboards or quarter-round trim cover the gap.

Acclimation

The Pergo guide says to let unopened cartons lie flat in the install room for 48 to 96 hours before you start, and at least 96 hours in very dry or very humid climates.

Stagger Pattern (6 to 8 Inches Minimum)

Offset the end joints of adjacent rows by at least 6 to 8 inches. This distributes stress, prevents a grid-like seam pattern and gives the floor a more natural look. Many manufacturers recommend a minimum offset in the installation instructions.

The geometry is exact for rectangular rooms and standard plank sizes. The main limits are about real-world conditions, not the math.

Divide your room area by the area of one plank, multiply by your waste factor, round up to whole planks, then divide by the planks per box and round up again. For a 120 sq ft room with standard 48 x 5 inch planks and 10 percent waste, that works out to 80 planks or 10 boxes of 8.

Multiply the room length by its width to get the area in square feet. Divide by the area of one plank (length in inches times width in inches divided by 144). Add your waste percentage and round up to whole planks and boxes.

One manufacturer guide (Pergo) says to add 10 percent for a standard installation and 15 percent for a diagonal one. Rooms with many corners, obstacles or complex patterns may need more, so check your own installation guide.

The most common size is 48 inches long by 5 inches wide (1.6667 sq ft per plank). Wide planks at 48 x 7 or 48 x 8 inches are also popular for a modern look.

Most laminate floors require underlayment for cushioning, sound dampening and moisture protection. Some products have underlayment pre-attached. Check the product specifications.

An expansion gap is a small space left between the flooring and every wall and fixed object. Laminate expands and contracts with temperature and humidity, and the gap prevents buckling. One manufacturer lists 1/4 inch in one guide and 3/8 inch in another, so follow your own guide. Baseboards or trim cover it.

Transition strips bridge the joint between laminate and another floor surface at doorways. T-molding is for same-height floors, reducers are for height changes, and end caps finish an exposed edge.

It varies by brand, but 8 planks per box is common for standard 48 x 5 inch planks. Always check the product packaging for the exact count and the square footage per box.

The plank-count geometry is the same for any click-lock plank product. For vinyl-specific estimates, you can also try the vinyl flooring calculator.

The math is exact for rectangular rooms and the plank size you enter. Real accuracy depends on measuring the room carefully and checking the product label for the exact plank dimensions and box count.

• Pergo: Installation Essentials Guide for Laminate Flooring (3/8 in revision) (add 10 percent for standard and 15 percent for diagonal installs; acclimation of 48 to 96 hours; 3/8 inch expansion space; transition rules).
• Pergo: Installation Essentials Guide for Laminate Flooring (1/4 in revision) (the same guide in a revision that lists a 1/4 inch expansion space).
• Wikipedia: Laminate flooring (layers, floating installation, underlayment, and the general 1 to 10 mm expansion gap).