Flooring Calculator
Flooring is sold by the box, but rooms are measured by the foot — and the gap between the two is where budgets break. This flooring calculator converts your room dimensions into the material square footage you actually need, adds a waste allowance matched to your flooring type, and rounds up to whole boxes or cartons. Works for hardwood, laminate, luxury vinyl plank, and carpet, in imperial or metric units.
Longest wall-to-wall distance
Widest wall-to-wall distance
Laying tile? The Tile Calculator adds grout and thinset.
Square feet covered by one box or carton (check the product label)
Flooring needed (with waste)
132ft²
- Boxes / cartons to buyRounded up — flooring is sold in full boxes
- 7
- Waste allowance
- 12ft²
- Net room area
- 120ft²
How it was calculated
- Net area = 12 ft × 10 ft = 120.0 ft²
- Waste (10%) = 120.0 × 10% = 12.0 ft²
- Material = 120.0 + 12.0 = 132.0 ft²
- Boxes = ceil(132.0 ÷ 20) = 7
How it works
Room area comes first: length × width gives the net square footage of the floor.
Every flooring type needs a cutting-waste allowance — boards get trimmed at walls, doorways, and angles. Hardwood and laminate typically need 10%, luxury vinyl plank about 7% thanks to its click-lock efficiency, and carpet around 12% because seams and pattern matching consume more material. Material needed = net area × (1 + waste rate).
Boxes are rounded up, never down: boxes = ceil(material needed ÷ coverage per box). A partial box cannot be bought, so the calculator always rounds to the next whole carton.
Installing ceramic or porcelain tile? This page covers sheet and plank goods; the Tile Calculator adds layout-specific waste, thinset, and grout.
Worked examples
12 × 10 ft bedroom in laminate
A 12 ft × 10 ft bedroom is 120 ft². Laminate carries a 10% waste allowance: 120 × 1.10 = 132 ft² of material. At 20 ft² per box, 132 ÷ 20 = 6.6 → round up to 7 boxes. The waste allowance is 12 ft² — enough for end cuts and one or two miscut boards.
15 × 12 ft living room in luxury vinyl plank
A 15 ft × 12 ft living room is 180 ft². Luxury vinyl plank needs about 7% waste: 180 × 1.07 = 192.6 ft². With 24 ft² cartons, 192.6 ÷ 24 = 8.03 → 9 cartons. Waste is 12.6 ft²; keep one spare carton for future repairs.
How to measure
- Measure each room at its longest and widest points — flooring is ordered for the full rectangle, and cuts fill the rest.
- Measure in feet and inches, then convert; a 12 ft 6 in room is 12.5 ft, not 12.6.
- For L-shaped rooms, split the floor into two rectangles, run the calculator for each, and add the box counts.
- Check the coverage printed on the box — "20 ft² per carton" varies by brand and plank size.
- Measure closets and alcoves separately if they use the same flooring; small areas still need cuts.
Assumptions & limitations
Planning estimate
- Waste percentages (hardwood 10%, laminate 10%, luxury vinyl 7%, carpet 12%) are a rule of thumb for rectangular rooms — diagonal layouts, many doorways, or irregular shapes need more.
- Box coverage is taken from your input; always verify against the product label before ordering.
- Carpet is often priced by the square yard (9 ft²); this calculator works in square feet throughout.
- Estimate only — subfloor prep, underlayment, and transitions are not included.
Frequently asked questions
Order 7–12% beyond the net room area, depending on material: about 10% for hardwood and laminate, 7% for luxury vinyl plank, and 12% for carpet. Diagonal installations and rooms with many corners or doorways deserve the high end of that range. The leftover is not trash — it covers end cuts, notched boards around door frames, and the occasional miscut. Keep at least one full box after the job for future repairs.
Flooring is only sold in full cartons, so 6.6 boxes means buying 7. Rounding down would leave you short mid-installation, and dye lots vary between production runs — a second trip to the store can mean visibly mismatched boards. The calculator always rounds up so one purchase covers the whole room.
You can get a rough material area here, but tile deserves its own math. The Tile Calculator accounts for tile size, layout (straight, diagonal, herringbone), plus thinset mortar and grout quantities that this page does not cover. Use that page for any ceramic, porcelain, or stone tile project.
Yes — measure the full bounding rectangle (longest length × widest width) rather than subtracting nooks. Flooring cuts around obstacles still consume boards, so the bounding-rectangle method with the waste allowance is the safer estimate. For L-shaped rooms, split the space into two rectangles and calculate each separately, then add the results.
Divide the square-footage result by 9 — 132 ft² of carpet becomes 14.67 yd². Carpet retailers price and often sell by the square yard, so this conversion helps you compare quotes. Remember the waste allowance is already in the headline figure, so convert the headline, not the net room area.