About the flooring waste calculator
Flooring is sold by the box, and every box covers a fixed area printed on the label. The amount you need is the room area plus a waste allowance for end cuts, defects and pattern matching. Pattern matters: a straight lay wastes far less than a herringbone.
Pick the pattern to use a suggested allowance, or type your own percentage — for example, if the manufacturer's instructions recommend a specific overage.
How to use it
- Measure the room. Include closets and areas under appliances that will be floored.
- Choose the installation pattern, or enter a custom waste percentage.
- Enter the coverage per box from the packaging.
- Add a price per box or per square foot/metre for a cost estimate.
Formula
Area to buy
A_buy = A × (1 + waste % ÷ 100)Boxes
boxes = ⌈ A_buy ÷ coverage per box ⌉Spare
spare = boxes × coverage − A- Suggested allowances: straight lay 5–10 %, brick bond ≈10 %, diagonal 10–15 %, herringbone/chevron 15–20 %. These are common trade rules of thumb, not manufacturer requirements.
Worked example: A 15 ft × 12 ft room, straight lay, 20 ft² per box
- Area = 180 ft²
- +10 % = 198 ft²
- 198 ÷ 20 = 9.9 → 10 boxes (200 ft²)
- Spare after install ≈ 20 ft²
Result: Buy 10 boxes.
Assumptions and limitations
- Rooms with many doorways, angled walls or stairs need more waste than the suggested values.
- Underlayment, transitions and trims are not included.
Frequently asked questions
What is the waste factor for laminate flooring?
Around 5–10 % for a straight lay in a simple room is common. Check the manufacturer's instructions — some recommend a specific overage.
Why does herringbone need so much extra?
Every board meeting a wall is cut at an angle, and pattern alignment produces more offcuts that cannot be reused.
Should I keep spare flooring?
Yes. Keeping a box or a few boards from the same production lot makes repairs far easier later.
Sources and further reading
Results are estimates for planning purposes. See our disclaimer for details.