Laminate Flooring Calculator

For bedrooms and guest rooms, AC1 or AC2 is sufficient. For living rooms, dining rooms, and hallways, choose AC3. For high-traffic areas, home offices, or any commercial space, choose AC4 or AC5. The AC rating (abrasion class, defined by ISO 10874) measures the wear layer's resistance to abrasion, impact, and staining — higher ratings mean longer lasting floors under heavier use. Confirm the AC rating printed on the product label matches your room's traffic before purchasing planks.

Yes — underlayment is required for all click-lock (floating) laminate installs. It cushions the floor, reduces noise, and helps bridge minor subfloor imperfections. Thickness ranges from 2 mm (basic) to 3 mm (premium sound dampening). Note: many modern laminate products come with underlayment pre-attached to the planks — check the product label before purchasing separate underlayment. Per NALFA's laminate installation FAQ, floating installs require underlayment padding, with a 6-mil vapor barrier added over concrete.

A 6-mil polyethylene moisture barrier is required whenever you install laminate over a concrete subfloor. Concrete releases moisture vapor that can cause laminate to swell, buckle, or delaminate over time. Over wood subfloors, a moisture barrier is optional, with added value in bathrooms or below-grade areas. Some underlayments have a built-in vapor barrier — confirm this before buying separately. Per NALFA's laminate installation FAQ, always use a 6-mil vapor barrier over a concrete subfloor.

This calculator adds a waste allowance to your measured area — a smaller allowance for straight layouts and a larger one for diagonal layouts, because angled cuts at every wall produce triangular offcuts that cannot be reused. Straight-run cuts, by contrast, often leave end pieces long enough to start the next row. Always round up to the next full carton — you cannot buy partial cartons — and confirm the carton coverage on the product label before ordering.

Possibly. Laminate adds 6–12 mm of height (plank) plus 2–3 mm of underlayment, for a typical total of 8–15 mm. If your door currently has less clearance than that, the door will not swing freely after installation. Check the gap under each door before installing. If the total new floor height (shown in your results) exceeds 12 mm, you may need to trim the door bottoms. Plan on undercutting door jambs and trimming door bottoms before laying the first row, not after.

Click-lock (floating) laminate planks snap together without adhesive and float over the subfloor on top of underlayment. It is a widely chosen DIY method — no adhesive or fasteners required, making installation and removal more straightforward than glue-down or nail-down. Glue-down laminate is adhered directly to the subfloor with full-spread adhesive and requires no underlayment. Glue-down is more stable and quieter underfoot but is harder to remove and requires the subfloor to be perfectly flat and clean. Floating click-lock is the typical residential laminate approach because it needs no adhesive and installs faster; glue-down is chosen when a firmer, quieter floor is worth the added labor.

It varies by product. Most cartons cover 20–24 sqft. To find the plank count, divide the carton coverage by the individual plank area (width × length ÷ 144). For example, a 7.5" × 48" plank covers 2.5 sqft per plank — a 22 sqft carton contains about 9 planks. Always check the carton label for the stated coverage figure and enter it in the calculator. The carton label lists both the coverage and the piece count for your specific product.

Often yes, but with conditions. The existing floor must be solid, flat, and firmly attached. Avoid installing over thick carpet, multiple layers of flooring (floor height becomes too high), or any flooring with moisture damage. Adding laminate over existing flooring increases the total floor height — use the door-clearance check in this calculator to verify your doors will still open freely. Check your flooring manufacturer's installation instructions for acceptable substrates before laying over any existing finished floor.

Break the L-shape into two rectangles, measure each section separately (length × width), then add the areas together. For irregular walls, measure to the longest point on each side and round up. Always measure twice for accuracy. Most laminate flooring calculators, including ours, let you enter two sections separately for L-shaped rooms. Measure twice and round up before ordering cartons.

8mm laminate is budget-friendly and suitable for bedrooms and low-traffic areas. 10mm offers a good balance of durability and cost for living spaces and hallways. 12mm offers greater durability and rigidity than thinner options — it spans minor subfloor imperfections better and feels more solid underfoot, with the trade-off of higher cost per sqft. Note that thicker planks raise the floor height more, which matters for door clearance. Use the door-clearance check in this calculator (plank plus underlayment thickness) before purchasing thicker planks.

Generally, no — adding extra underlayment under pre-attached underlayment creates too much compression and can cause the click-lock joints to fail over time. Most manufacturers specifically prohibit additional underlayment when their plank already has one attached. Check your product's installation guide before adding anything beneath it. Stacking extra foam under attached-pad laminate over-compresses the click-lock joints and is prohibited by most manufacturers.

Use transition strips to bridge gaps between laminate and other flooring at doorways. T-molding connects same-height floors (e.g., laminate to laminate in adjacent rooms). Reducer strips connect laminate to a lower floor (e.g., laminate to tile). Thresholds connect to exterior doorways. Measure the height difference and width at each transition and order the matching profile. Install T-molding and reducer profiles at all doorways and changes in finished-floor height.

Yes, laminate can be installed on concrete, but a vapor barrier is essential. Concrete is porous and releases moisture that will buckle and warp laminate over time. Use a polyethylene film (6 mil minimum) or a combination underlayment with a built-in vapor barrier rated for concrete subfloors. Test concrete moisture first — if moisture exceeds your product's specs, address the source before installing. Per NALFA's laminate installation FAQ, always use a 6-mil vapor barrier over a concrete subfloor.

Underlayment rolls list their coverage on the label. Divide your room's total square footage by the roll coverage, then round up to the next whole roll, and order one extra roll to cover seam overlap and waste at walls. For L-shaped rooms, calculate each section separately then add. This calculator already includes a seam-overlap allowance in its underlayment sqft estimate.

This laminate flooring calculator starts with your net room area (length × width), adds a waste allowance (larger for diagonal layouts than straight, because angled cuts waste more), and divides the gross area by your carton's coverage to give a whole-carton count. It also checks door clearance (your floor height increase vs. current door gap), outputs an underlayment sqft estimate, and flags whether a moisture barrier is required based on your subfloor type. Enter your plank dimensions and carton coverage from the product label for a precise count, and confirm acclimation and expansion-gap steps in your product's installation instructions before ordering.