Laminate Flooring Calculator
Estimate how many boxes of laminate or LVP flooring and rolls of underlayment you need for your room.
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Laminate Plank Layout
Enter room dimensions, carton coverage, a layout-specific waste allowance, and underlayment roll coverage. Cartons and rolls are rounded up to whole units.
How to Use the Laminate Calculator
Installing floating floors is one of the most popular DIY projects. Because flooring is sold by the box rather than by the plank, you need to know your total square footage and the box's coverage capacity.
- Measure the room: Measure the maximum length and width of the room in feet. Don't subtract for small obstacles like cabinets.
- Check box coverage: Look at the product label for the flooring you want to buy. It will explicitly state "Coverage: X sq ft". Enter that number into the calculator.
- Set waste and underlayment: Choose a layout-specific waste allowance and enter the square-foot coverage of the selected underlayment roll.
Laminate Calculation Formula
We calculate room area, apply the selected layout-waste allowance, and divide by exact carton coverage. Underlayment uses its own roll coverage.
Step 1: Room Area
Area = Length × Width
Step 2: Add Waste Factor
Total Material Needed = Area × (1 + Selected Waste %)
Step 3: Convert to Boxes
Boxes Needed = Total Material Needed ÷ Box Coverage Sq Ft
Step 4: Underlayment
Rolls = Room Area ÷ Selected Roll Coverage
Laminate Example Calculation
You are putting new LVP in a 15-foot by 12-foot bedroom. The boxes at the store cover 23.5 square feet each.
- Room Area: 15 × 12 = 180 sq ft.
- Add 10% Waste: 180 × 1.10 = 198 sq ft.
- Boxes Needed: 198 ÷ 23.5 = 8.42 (Round up to 9 boxes).
- Underlayment example: At 100 sq ft per roll, 180 ÷ 100 = 1.8 (buy 2 rolls).
Conclusion: You will need 9 boxes of flooring and 2 rolls of underlayment.
Tips for Installing Laminate
- Acclimate the flooring: If you need other materials for this project, check out our Tile Calculator. Laminate and wood flooring will expand and contract based on humidity. Always leave the unopened boxes in the room where they will be installed for 48 hours prior to installation so they can acclimate.
- Leave an expansion gap: Never butt laminate planks tightly against the wall. You must leave a 1/4-inch expansion gap around the entire perimeter of the room. This gap will be hidden later by your baseboards or quarter-round molding.
- Undercut the door jambs: Do not try to cut your planks in complicated shapes to fit around wooden door frames. Instead, use an oscillating multi-tool to cut the bottom of the door frame off, and slide the flooring directly underneath it for a perfect finish.
Transparent estimate
Accuracy, assumptions, and sources
Reviewed September 29, 2026
Calculates floor area, boxes, and underlayment from editable waste and package coverage.
What this estimate assumes
- Default flooring waste is 10%.
- Box and underlayment coverage should be copied from the selected product.
What it cannot know
- Closets, transitions, pattern direction, room irregularity, damaged planks, and manufacturer installation rules affect quantity.
Reference links
Found a questionable result? Report the inputs and result so the calculation can be rechecked.
Frequently Asked Questions
How much square footage is in a box of laminate?
Unlike tile which is sold by the individual piece, laminate and Luxury Vinyl Plank (LVP) are sold by the carton. An average carton contains between 20 and 24 square feet, but you must check the specific box at the store to get the exact coverage.
Do I really need a 10% waste factor?
Ten percent is a common planning allowance, not a universal requirement. Room shape, plank direction, pattern, minimum joint offset, damage, and reusable cuts should determine the value. The calculator lets you adjust it.
Does my laminate require underlayment?
Many modern laminate and LVP products come with a foam underlayment pad already glued to the back of the plank. If your plank says 'Attached Pad', you do not need to buy separate rolls of foam underlayment unless you are installing over a concrete slab (which requires a vapor barrier).
Which way should I run the planks?
Visually, rooms look larger when the planks run parallel to the longest wall. Structurally, if you have a wood subfloor, it is best to run the laminate planks perpendicular to the floor joists to prevent the floor from sagging.