How to estimate flooring
Flooring is sold in boxes or packs that cover a fixed area, printed on the label (for example 20.5 ft² per box or 2.22 m² per pack). The number of boxes you need depends on three things: the floor area, the coverage per box and the waste allowance for cuts, mistakes and pattern matching.
area needed = floor area × (1 + waste % ÷ 100)
boxes = area needed ÷ coverage per box, rounded up
Example: a living room of 250 ft² with laminate that covers 20 ft² per box. With 10% waste you need 275 ft², which is 13.75 boxes, so you buy 14 boxes. At $45 per box the material costs $630.
Metric example: a 24 m² bedroom, 10% waste and packs of 2.22 m²: 26.4 ÷ 2.22 = 11.9, so 12 packs.
How much waste should I allow?
| Situation | Typical waste allowance |
|---|---|
| Laminate or vinyl plank, straight lay, simple room | 5–10% |
| Rooms with many corners, doorways or pipes | 10–15% |
| Tile, standard straight pattern | 10% |
| Diagonal or herringbone patterns | 15–20% |
| Large-format tiles or natural stone | 10–15% |
Start with 10% unless the pattern or room shape is complex. Leftover boxes are useful for future repairs, and many stores accept unopened boxes back. Buying everything at once also ensures all boards come from the same batch, which matters for colour consistency.
Measuring the room
- Measure the length and width of the room at the widest points and multiply them. Use the square meter calculator for triangles, circles or unit conversion.
- For L-shaped rooms, split the floor into rectangles and add them up.
- Include closets and alcoves that will get the same floor; subtract fixed kitchen islands or built-in units you will not floor under.
- Measure in the unit used on the box. Mixing square feet and square metres is a classic error, so make sure the area units match.
Beyond the boxes
- Underlayment. Laminate and many floating floors need an underlay, sold by the roll; use the same area plus a small overlap.
- Trims and transitions. Measure the perimeter for skirting boards or quarter-round, and count doorways for threshold strips.
- Adhesive and grout. For tile you also need thinset and grout; coverage per bag is printed on the packaging.
- Acclimatisation. Wood and laminate should rest in the room for 24 to 48 hours before installation.
- Painting the walls too? Our paint calculator estimates the amount of paint for the same room.
Ordering and acclimatizing
Order all your flooring in one go, so every box comes from the same production batch; colors can vary slightly between batches. Check the boxes on delivery for damage and matching batch numbers. Laminate and engineered wood usually need to acclimatize in the room for 24 to 48 hours before installation, flat and still in their packaging, so they adjust to the temperature and humidity. Keep one or two spare boxes after the job: if a board gets damaged later, you can replace it with an identical one. And keep the receipt, because many stores accept unopened boxes for a refund.
Frequently asked questions
How many boxes of flooring do I need for 500 square feet?
Add waste first: 500 × 1.10 = 550 ft². Divide by the coverage per box; with 22 ft² per box you need 25 boxes.
Should I round up the number of boxes?
Always. You can’t buy part of a box, and running short in the middle of a job often means a different production batch with a slightly different colour.
How much extra flooring should I buy?
Generally 10%. Use 5% for simple rectangular rooms with straight-laid planks and 15–20% for diagonal patterns, herringbone or rooms with many angles.
Does the waste allowance apply to tiles too?
Yes. Tiles need cutting at the edges and around obstacles, and some may break. A 10% allowance is standard; more for diagonal layouts.
Can I use square metres?
Yes. Switch the area units to m², then enter both the room area and the coverage per pack in square metres.
Last reviewed: 2026-10-06. Results are estimates for information only.