Calculating laminate flooring correctly: area, cutting waste and packs
Buying too little forces reorders – often from a different batch
The formula for laminate flooring calculation is: Packs = ⌈(Area × Waste Factor) ÷ Pack Coverage⌉. Rounding up (the ceiling function) is mandatory – any pack you start must be bought in full. For an area of 20 m², 5% cutting waste and a pack coverage of 2.5 m², the result is: 21 m² ÷ 2.5 = 8.4 → 9 packs. One pack too few means a reorder with the risk of a different production batch.
Estimating cutting waste correctly: Cutting waste comes from edge pieces along the walls that have to be cut off. For straight installation parallel to the long wall, 5% is completely sufficient. For diagonal installation at 45°, waste rises to 12–15% because triangular edge pieces occur at every wall. Rooms with an L-shape or many recesses (radiator recesses, door frames) require an additional 5% reserve because many short fitting pieces are needed.
Planning where to start laying: Professionals always start at the brightest wall (usually opposite the window side) and lay in the direction of the light. The first row determines the offset – in classic click installation, the planks are offset by 1/3 or 1/2 of the plank length, which creates an attractive grain pattern and improves stability.
Don't forget the underlay: Laminate needs a suitable impact sound insulation underlay (2–3 mm PE foam or cork). With underfloor heating, the underlay must have a thermal resistance below 0.15 m²K/W. Many modern laminate products already have the impact sound insulation attached and can be installed without a separate underlay.