Buying flooring is a two-step area calculation: work out the floor area, then convert it into whole boxes. Floor area is simply length × width, and the number of boxes is that area divided by the coverage printed on each box — boxes = area ÷ coverage × (1 + waste), rounded up. The two things that trip people up are reading the right coverage figure off the packaging (it varies a lot by plank size) and allowing enough waste for cuts, especially with diagonal or herringbone patterns.
Reviewed: June 20, 2026 · Author: Naveen P N, Founder — AI Calculator · Verified against: standard area-coverage estimating for boxed flooring.
The flooring equations
Measure the room and multiply for the area; for an L-shaped or irregular room, break it into rectangles and add the areas. Divide by the coverage one box provides, multiply by the waste factor and round up to whole boxes. Keep the room area and the box coverage in the same unit — both square metres or both square feet — and the box count will be right regardless of which system you use.
Worked example — flooring a room
Scenario: A 5 m × 4 m living room, flooring boxes that each cover 2 m², with a 10% waste allowance for cuts.
You need 11 boxes, giving 22 m² of flooring for a 20 m² room — the extra 2 m² covers offcuts and trims. Switch to large planks that cover 2.5 m² per box and you'd need only 8 boxes before waste; small planks at 1.5 m² push it to 14. For a herringbone layout in the same room, bump the waste to 15% and order 12 boxes to be safe.
Frequently Asked Questions
Area (L×W) ÷ coverage per box, + waste. 20 m² with 2 m² boxes ≈ 11 boxes at 10% waste.
5–10% straight, 10–15% for diagonal/herringbone or rooms with many angles. Keep spares from the batch.
Split it into rectangles, find each area, and add them. L-shape = two rectangles.
At 2 m²/box: 10 (11 with waste). At 2.5 m²: 8. At 1.5 m²: 14. Check the box coverage.
Either — just keep area and box coverage in the same unit. 1 m² ≈ 10.76 sq ft.