Buy the right amount of flooring the first time.
Enter your room size and box coverage to see exactly how many boxes to buy, how much waste to add for cuts, your total square footage and the full cost. Works for laminate, hardwood, vinyl plank and tile.
The room
Add 10% for a straight lay, 15% for diagonal or herringbone patterns, or 5% for simple square rooms.
Check the box label for coverage. A typical laminate or vinyl plank box covers 18 to 24 sq ft.
Before you order
Boxes by waste factor
How pattern choice changes your order
Cost breakdown
Compare waste factors side by side
The same room at three common waste levels, so you can see the cost of a busier install pattern.
| Waste factor | Area with waste | Boxes | Sq ft purchased | Leftover | Total cost |
|---|
Estimating flooring, explained
How to Measure a Room for Flooring
Start by finding the area of the room. For a simple rectangle, multiply the length by the width, so a 15 by 12 ft room is 180 square feet. For rooms with alcoves, closets or an L shape, split the space into rectangles, measure each one, and add the areas together. Always include doorways and closets you plan to floor.
Round each measurement up to the nearest few inches rather than down, and measure at the widest points. It is far cheaper to have a little extra material than to run one box short and discover the dye lot has sold out. The area you calculate here is the bare floor, before any waste is added.
Why the Waste Factor Matters
No installation uses every square inch of every plank. Cuts at the walls, around corners and at doorways all leave offcuts you cannot reuse, so you buy more than the raw floor area. The waste factor is the percentage of extra material you add to cover those losses. A straight lay in a plain rectangular room typically needs about 10%.
Busier layouts waste more. Diagonal and herringbone patterns call for around 15% because every board meets a wall at an angle, producing more unusable offcuts. A very simple square room with few obstructions can sometimes get by with 5%. When in doubt, round up: the leftover boxes become your repair stock.
Turning Square Footage Into Boxes and Cost
Flooring is sold by the box, and each box covers a set number of square feet. To find how many boxes you need, divide your area including waste by the coverage per box, then round up to the next whole box, because you cannot buy a partial one. Multiply the number of boxes by the price per box to get your material cost.
Because you always round up, you end up with some leftover flooring. That extra is a feature, not a mistake. Keep at least one unopened box so a damaged plank can be replaced years later with a perfect match. This calculator reports boxes, total square footage purchased, leftover material and total cost so you can order with confidence.
Common questions
How much extra flooring should I buy?
Add a waste factor to your room area: about 10% for a standard straight lay, 15% for diagonal or herringbone patterns, and 5% for a plain square room. This covers cuts and offcuts, and leaves a little material for future repairs.
How do I calculate how many boxes of flooring I need?
Multiply the room length by the width to get the area, add your waste factor, then divide by the coverage per box and round up to the next whole box. For example, 180 sq ft plus 10% waste is 198 sq ft, and at 20 sq ft per box that is 10 boxes.
Why should I keep leftover flooring?
Keeping at least one unopened box gives you an exact match for repairs later. If a plank is scratched or water damaged, you can swap it without a visible difference, since the same product from a different dye lot may not match perfectly.
What is a dye lot and why does it matter?
A dye lot is a single production batch of flooring. Boards from the same lot share consistent color and finish, while boards from different lots can vary slightly. Buy all your flooring at once from the same dye lot so the whole floor looks uniform.
Estimates for planning only. Always confirm box coverage on the actual product label, measure your room carefully including closets and doorways, and buy a little extra from the same dye lot for future repairs.