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Laminate flooring calculator
Put your room length, width, box coverage and waste in: a 12 ft by 10 ft room is 120 sq ft — 6 boxes exact, 7 boxes with 10% waste.
★ CONSTRUCTION · FLOORING · LAMINATE
Laminate Flooring Calculator: 7 Boxes for 12x10 ft Room
On the defaults — a 12 ft by 10 ft room, 20 sq ft boxes, 10% waste — you need 7 boxes of laminate flooring. This is the laminate tool: measure the room once, allow for the cuts, and order the boxes once — a half-floored room waits for no second delivery.
What does laminate flooring needed 7 boxes mean?
It means seven boxes cover a 12 ft by 10 ft room once cutting waste is allowed for. The room itself is 120 square feet, since 12 times 10 is 120; with 10% waste that becomes 132 square feet of laminate, and at 20 square feet per box the exact count is 6.6 boxes, rounded up to 7 whole boxes because boxes are sold by the box, not by the fraction. The waste box is not spare stock exactly — it is the box the room consumes in end cuts and breakage, so a room floored without waste runs short at the last row.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Room area | length × width | 120 sq ft — 12 × 10. |
| Area with waste | area × (1 + waste ÷ 100) | 132 sq ft — 120 × 1.10. |
| Boxes | area with waste ÷ box coverage, rounded up | 7 boxes — 132 ÷ 20, rounded up. |
Three things to check before you trust the number
First, check the box coverage you are actually buying: 20 sq ft is the figure on the box, but a different product covers a different area, and the count follows the box, not the room. Second, remember the count follows the area, not the length: a 12 ft by 10 ft room is 120 sq ft, and a room measured by one wall under-orders. Third, judge the waste honestly: laminate is cut at the ends of rows, so 10% fits a rectangular room, but a room with angles, closets and doorways can want 15%, since every angle consumes planks. Underlayment and trim are bought separately — see the subfloor calculator for the sheets under the floor.
Worked example
12 ft long, 10 ft wide, 20 sq ft per box, 10% waste. Area: 12 × 10 = 120 sq ft. With waste: 120 × 1.10 = 132 sq ft. Boxes: 132 ÷ 20 = 6.6, rounded up to 7 boxes. In practice that means buying 7 boxes, and expecting the last box to go on the end cuts and the breakage. If the same room used 25 sq ft boxes instead, the need would fall to 6 boxes with waste, but the room floored would be identical.
Every branch, checked
With a 14 ft long room instead of 12 ft, the area rises to 140 sq ft and the need to 8 boxes with waste. With a 12 ft wide room, the area rises to 144 sq ft and the need also reaches 8 boxes with waste, since 158.4 sq ft still needs an eighth box. With 25 sq ft boxes, the area stays 120 sq ft but the need falls to 6 boxes with waste. With 0% waste, the area stays 120 sq ft and the need falls to 6 boxes. Room size, box coverage and waste each move the count on their own, so a wrong box figure is as costly as a wrong measurement.
The reverses, worked backwards
The length behind 7 boxes is 12 ft: at 10 ft the need is 6 boxes (100 sq ft room, 110 sq ft with waste, 20 sq ft per box, 10% waste); at 14 ft it is 8 boxes (140 sq ft room, 154 sq ft with waste, 20 sq ft per box, 10% waste). The width behind 7 boxes is 10 ft: at 8 ft the need is 6 boxes (96 sq ft room, 105.6 sq ft with waste, 20 sq ft per box, 10% waste); at 12 ft it is 8 boxes (144 sq ft room, 158.4 sq ft with waste, 20 sq ft per box, 10% waste). The waste behind 7 boxes is 10%: at 0% the need is 6 boxes (120 sq ft room, 120 sq ft with waste, 20 sq ft per box, 0% waste); at 20% it is 8 boxes (120 sq ft room, 144 sq ft with waste, 20 sq ft per box, 20% waste). Each reverse moves one input and holds the rest, so the step is exactly one dimension or one waste change.
What the defaults assume
The defaults assume a 12 ft by 10 ft rectangular room, 20 sq ft laminate boxes, and 10% cutting and breakage waste. They do not assume underlayment, transition strips or skirting — a room with doorways needs its transitions counted separately, and the underlayment is bought by the roll, not by the box.
Who uses this
- A homeowner flooring one room: the 7-box order settles the store trip before the first plank is laid.
- A DIY builder refitting a bedroom: the same maths on the room alone gives the boxes, not a whole house.
- A contractor quoting a job: room area, box coverage, waste — the quote follows the same three steps, and the waste line shows the client why.
- A landlord budgeting a room refit: the room size off the plans, multiplied out, gives the box line on the refit budget.
Accuracy & limitations
The arithmetic is exact for the inputs entered; the judgement is the box coverage and the waste allowance. Real rooms have closets, doorways and angles, and the box on the shelf overrides any planning figure; a room measured gross over-orders, and a coverage figure read off a different product under-orders. Treat 7 boxes as the planning order for a 12 ft by 10 ft room at 20 sq ft per box, and raise the waste to 15% for a room with many angles.
Cite this calculator
Bright Side Kit, “Laminate Flooring Calculator: 7 Boxes for 12x10 ft Room”, https://brightoolbox.com/laminate-flooring-calculator/, accessed 3 November 2026. Students and researchers: cite the calculator name, the page URL and the date you used it, and quote the defaults (12 ft × 10 ft room, 20 sq ft per box, 10% waste) so the 7-box result can be checked.
Frequently asked questions
How many laminate boxes do I need for a 12x10 ft room?
7 boxes at 20 sq ft per box with 10% waste. The area is 120 sq ft; with waste that is 132 sq ft, and 132 ÷ 20 = 6.6, rounded up to 7.
How do I work out laminate flooring from a room size?
Multiply length by width for the area, add waste, then divide by the box coverage and round up. A 12 ft by 10 ft room is 12 × 10 = 120 sq ft, or 7 boxes at 20 sq ft with 10% waste.
How much waste should I allow for laminate flooring?
10% for a rectangular room, 15% for a room with angles, closets and doorways. Waste is the end cuts and breakage, not spare stock.
Does this count underlayment too?
No — this calculator counts laminate boxes only. Underlayment is bought by the roll, and transition strips and skirting are counted separately.
Should I buy the exact boxes or round up?
Round up: boxes are sold by the box, and the spare box is the cutting stock. A room floored to the exact box leaves nothing for a miscut plank.
What if my room is not a rectangle?
Split it into rectangles, work out each area, and add them before dividing by the box coverage. The square footage calculator handles the area step room by room.