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
- Measure the room: Use length × width. For complex spaces, split into rectangles and add them together.
- Account for obstructions: Subtract areas you won’t cover (islands, hearths, closets).
- Pick your plank and box: Enter plank length/width and coverage per box (ft² or m²).
- Choose a waste percentage: 10% for straight runs; 12–15% for diagonal; 18–20% for herringbone or lots of corners.
- Review layout basics: The tool estimates rows, last-row width, and underlayment rolls.
Orientation, Stagger & Last Row
For the cleanest look, run planks along the longest wall. Keep end joints staggered at least 8″ from row to row. The calculator shows an estimated last-row width—if it’s under ~2″, consider ripping the first row narrower so the first and last rows end up similar widths.
Waste & Patterns
Waste covers offcuts, board defects, and pattern inefficiencies. Straight installs typically use 10%. Diagonal layouts often require 12–15%, while herringbone can need 18–20% or more depending on board size and room complexity. When in doubt, round up one extra box—you can usually return unopened cartons.
Underlayment & Moisture Barrier
Most floating laminate systems require underlayment for cushioning and sound reduction. On concrete slabs, use a vapor/moisture barrier per the manufacturer’s recommendations. Our calculator estimates underlayment rolls based on the same waste-adjusted area you’ll cover with flooring.
FAQs
What if my room isn’t a perfect rectangle?
Split it into two rectangles and enter Room 2, or subtract obstructions for islands and hearths.
How many extra planks should I keep?
Keeping one or two unopened boxes for future repairs is common. If you provide “planks per box,” we’ll estimate extras after your job.
Do I need transition strips?
Use transitions at doorways, between different flooring types, or where long runs need a break. Enter a count to include them in your plan.
Related Tools
Planning more projects? Try our Wallpaper Calculator, Picket Fence Calculator, and Water Softener Size Calculator.
Important Estimate Disclaimer
The results provided by this calculator are intended as general estimates only and should not be considered precise engineering measurements. Actual material requirements, costs, and quantities can vary significantly based on site conditions, local building codes, soil type, reinforcement requirements, climate exposure, and the intended use of your project.
These calculators are designed to help you plan and budget your project more effectively, but they do not replace professional advice from a qualified contractor, engineer, or building inspector. Always verify your calculations and assumptions with trained professionals before placing material orders or commencing construction.
For more information on the assumptions, formulas, and data used in these tools, see our Data Sources and Methodology pages.
Material estimates, cost figures, and volume calculations are approximate and may not reflect your actual requirements. Always double-check dimensions and project-specific needs, and consider adding a contingency allowance for waste, over-excavation, and unforeseen conditions.
If you are unsure about any aspect of your project — including structural requirements, reinforcement needs, drainage, or load-bearing capacity — consult with a licensed professional before proceeding.