Laminate Flooring Calculator
This free laminate flooring calculator shows how many boxes you need for a room. Enter the length, width, box coverage, and a waste factor to get the boxes to buy.
How many boxes of flooring?
How the laminate flooring calculator works
The laminate flooring calculator multiplies the room length by the width to get the floor area, adds a waste factor for cutting and mistakes, then divides by the coverage printed on each box and rounds up to whole boxes. The formula is floor area × (1 + waste) ÷ coverage per box. Box coverage varies by product – most cover 18 to 25 square feet – so always use the figure on your carton.
The waste factor is the number to get right. A simple, square room with a straight layout wastes little, so 10% is the residential standard. Diagonal, herringbone, or rooms with lots of closets, angles, and doorways need 15% or more because so many planks are cut to fit. Narrow hallways also waste more due to frequent end cuts.
Worked example
For a 12 ft by 12 ft room, the floor area is 144 square feet. Adding a standard 10% waste factor brings it to about 158 square feet. If each box covers 20 square feet, that is 7.9 boxes, which rounds up to 8. Always round up and keep a spare plank or two from the same batch, since dye lots vary and a discontinued line can be impossible to match later.
Waste factor, subfloor, and acclimation
Beyond the box count, two things decide whether a floating floor lasts. Laminate must acclimate: leave the unopened boxes flat in the room for at least 48 hours so the planks adjust to its temperature and humidity before you lock them together. And the subfloor must be flat, clean, and dry, with a 6-mil vapor barrier over concrete.
For product and subfloor standards, the ANSI-accredited North American Laminate Flooring Association publishes what you can install laminate over and how to prep it, and this flooring methodology reference walks through the area-and-waste math in detail.
Ordering tips
Measure each room and closet separately, then add the areas together before applying waste. Buy all boxes from the same production run so the pattern and shade match, and check the coverage on the label rather than assuming – a box that covers 17 square feet instead of 20 changes the count. Underlayment is sold separately unless your planks have it pre-attached.
Frequently asked questions
How many boxes of laminate flooring do I need?
Enter the room length and width, the coverage per box, and a waste percentage. The calculator returns the boxes to buy. A 12 by 12 room at 10% waste with 20-sq-ft boxes needs about 8 boxes.
What waste factor should I use for laminate?
Use 10% for a standard straight layout in a square room, and 15% or more for diagonal or herringbone patterns, or rooms with many angles, closets, and doorways.
How much does a box of laminate cover?
Most boxes cover 18 to 25 square feet, but it varies by brand and plank size. Always use the coverage figure printed on your carton for an accurate count.
Do I need to acclimate laminate flooring?
Yes. Leave the unopened boxes flat in the room for at least 48 hours so the planks adjust to its temperature and humidity, which prevents gapping and buckling later.
Should I buy extra laminate flooring?
Yes. Round up to whole boxes and keep one or two spare planks from the same batch. Dye lots vary, and matching a discontinued product for a future repair is often impossible.