Boxes, underlayment and cost for laminate, vinyl plank or engineered hardwood floors.
Estimates are planning aids, not a professional quote. Double-check quantities and product coverage — and any local code or permit requirements — before you buy.
⚠ Floating floors must have a manufacturer's expansion gap (usually about 1/4–3/8 in) around the whole perimeter and at every fixed object. Skip it and the floor buckles when it expands — the gap is hidden later by quarter round or baseboard.
⚠ Never lay a floor over bare or damp concrete without a vapor barrier — moisture wicking up will ruin laminate and swell hardwood. Test the slab for moisture and use a barrier-backed underlayment on any slab.
⚠ Acclimate the flooring in the room for the time the manufacturer specifies (often 48–72 hours) before installing, so the planks are at the room's temperature and humidity. Rushing this is the most common cause of gaps and buckling.
| Flooring | $301–$407 |
| Membrane & Fabric | $55–$75 |
| Fasteners & Hardware | $5–$7 |
| Total | $361–$489 |
Excludes tools, delivery, tax and permit fees. Labor not included — this is a DIY materials estimate.
These are affiliate links: we may earn a commission if you buy through them, at no extra cost to you. It never changes what the calculator recommends — the shopping list comes from your dimensions, not from what pays.
About this calculator
Enter a room's length and width and pick laminate, luxury vinyl plank or engineered hardwood, and the Flooring Calculator returns exactly how many boxes to buy — with the right waste for a straight or diagonal layout — plus underlayment, transition strips, quarter round and a cost estimate. It divides the area by the coverage of one box so you order whole boxes and don't come up a plank short.
Turn underlayment and quarter round on or off, set the number of doorway transitions, and the takeoff updates instantly. Buy a spare box from the same batch and keep it — it's the only sure way to match a repair down the road.
Step by step
A step-by-step walkthrough to go with your plan above. Follow the product instructions and any local code or permit requirements as you work.
Bring the boxes into the room and let them sit flat for 48–72 hours (or whatever the manufacturer specifies) so the planks reach the room's temperature and humidity. Installing cold or dry planks is the top cause of later gaps and buckling.
Clean the subfloor and check it's flat — no more than about 3/16 in dip over 10 ft — grinding high spots and filling lows. It must be dry; test a concrete slab for moisture before going any further.
Lay the underlayment across the room, butting (not overlapping) the seams and taping them, or use a vapor barrier over concrete. Skip this step if your planks already have an attached pad.
Dry-lay to figure the layout so you don't end on a thin sliver, then set the first row along the straightest wall with spacers holding the expansion gap all around. Lock in a straight, square starting row — everything follows it.
Click each plank into the row and the previous course, staggering the end joints at least 6 inches so seams don't line up. Tap joints tight with a tapping block and mallet, keeping spacers at the walls.
Scribe and rip the final row to width, leaving the expansion gap, and pull it tight with a pull bar since there's no room to swing the block. Undercut door casings so planks slide underneath for a clean look.
Install transition strips at doorways and where the floor meets other surfaces, fastening the track and snapping in the cap. They protect the plank ends and bridge small height differences.
Pin quarter round or base shoe to the baseboard (not the floor, so the floor can still move) to cover the expansion gap around the room. Miter the corners, fill the nail holes, and the floor is done.
Equip the job
Hand-picked categories that match the shopping list above. Links open a current selection so you can compare brands and prices.
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Keep planning
Interior & Finishing
Answers
Buy your room's square footage plus a waste allowance: about 10% for a straight layout and 15% for a diagonal or herringbone one, which creates more angled cuts. The waste covers offcuts, mistakes and the occasional damaged plank, and leaves you a little spare. This calculator adds the waste and rounds up to whole boxes automatically.
Divide the area you're covering (with waste) by the square footage one box covers, then round up. A box of laminate covers around 20 sq ft and many vinyl planks around 24, but it varies by product — always check the number on the box. For a 12×10 room in laminate, that's about 7 boxes. Enter your size and the calculator does it for you.
It depends on the product. Many luxury vinyl planks come with an attached pad and shouldn't get a second underlayment — doubling up makes the floor too soft and can void the warranty. Bare planks and most laminate do need underlayment for cushioning, sound and, over concrete, a vapor barrier. Match it to your flooring's instructions; toggle it off if the pad is attached.
Yes — keep at least one full unopened box from your batch after the install. Planks shift slightly in color and texture between production runs, so a board bought later to fix a scratch or water damage rarely matches. A spare box from the same lot is cheap insurance and saves tearing up a whole floor for one repair.