Flooring Calculator
Estimate boxes of laminate, vinyl plank, or hardwood flooring.
Waste of 10% suits simple rooms; use 15% for diagonal installs or rooms with many angles. Box coverage is printed on the carton.
Flooring is sold by the box, priced by the square foot, and installed with waste — three different units that make mental math treacherous. Our flooring calculator above sorts it out: enter your room size, the coverage printed on your chosen product’s box, and a waste factor, and you’ll get total square footage and the exact number of boxes to buy.
The Calculation
Floor area = Length × Width
Total to order = Floor area × (1 + Waste factor)
Boxes = Total to order ÷ Coverage per box, rounded up to full boxes
Box coverage varies more than people expect — laminate boxes commonly cover 18–26 sq ft, vinyl plank 19–36 sq ft, and hardwood 15–25 sq ft. There is no standard; always read the carton or product page and put the real number into the calculator.
Why Waste Happens (and How Much to Allow)
Every row of plank flooring ends at a wall, and the cut-off piece can only start the next row if it’s long enough (typically at least 12–16 inches, to keep joints staggered). Add doorways, closets, vents, and the occasional miscut, and material disappears fast.
- 10% — standard installs: rectangular rooms, planks laid parallel to the long wall.
- 15% — complex installs: diagonal layouts, herringbone, rooms with many jogs and closets, or very long planks in small rooms.
- Add 5% more if you’re a first-timer — miscuts are part of learning, and a spare box today is cheaper than a discontinued product hunt next year.
Leftover boxes are not waste, by the way: keep one unopened box stored flat. Floors get damaged; matching planks get discontinued.
Measuring Irregular Rooms
For L-shaped or multi-space projects, split the floor plan into rectangles, calculate each, and add the areas before applying waste. Include:
- Closets (they get flooring too — the most commonly forgotten area)
- Doorway thresholds into adjoining rooms
- Under appliances in kitchens — run flooring under the fridge and stove; floating floors under a dishwasher need care (trapped floors can’t expand), so check your product’s instructions.
Measure at the widest points, and round each dimension up to the next inch.
A Note on Direction and Layout
Plank direction changes both looks and waste. The convention: run planks parallel to the longest wall or toward the main light source. Running planks the long way in a long room reduces the number of rows and often reduces waste slightly. Diagonal and herringbone layouts look spectacular and cost you that extra 5% — every wall cut happens at an angle, and herringbone adds pattern-matching offcuts.
Most floating floors also require an expansion gap (usually 1/4–3/8 inch) at every wall, covered by baseboard or quarter-round — our baseboard calculator can help with that part of the shopping list.
Frequently Asked Questions
How many boxes for a 12×14 room? 168 sq ft × 1.10 waste = 185 sq ft. With 20 sq ft boxes, that’s 10 boxes.
Should underlayment be included in the calculation? Underlayment is sold in rolls (often 100 sq ft); order the same total square footage as your flooring, without the waste factor — overlaps are minimal.
Do I use the same waste factor for tile-look vinyl? Yes — waste is driven by geometry (cuts and stagger rules), not by what the plank looks like.
Can I return unopened boxes? Usually yes at big-box retailers, which makes rounding up nearly risk-free. Specialty and clearance flooring is often final sale — one more reason to get the count right up front.
Estimates are for planning purposes. Coverage per box varies by product — always check your specific carton.