Laminate Flooring Calculator

About the Laminate Flooring Calculator

Laminate is one of the most popular floors for do-it-yourself fitting. The planks click together, float on an underlay without glue or nails, and a reasonably handy person can lay a bedroom in a day. The planning, though, is worth doing properly before the first pack is opened, because two things catch people out: running short of planks from the same batch, and arriving at the far wall to find the last row is a sliver a couple of centimetres wide.

This laminate flooring calculator handles both. It works out the number of planks from the room area, the plank size and a waste allowance, rounds up to whole packs, and then plans the rows across the room. It tells you how wide the last row will be once the expansion gaps are taken off, and if that row would be too narrow, it tells you how wide to rip the first and last rows so they are equal.

How to Use the Laminate Flooring Calculator

Choose metres or feet for the room.

Enter the room's length and width. The width is measured across the direction the planks will run — the rows are counted across it.

Enter the plank length and plank width from the packaging, in millimetres (or inches in feet mode). Use the visible face size; the tongue is not counted.

Enter the planks per pack.

Adjust the waste allowance if needed; 10% suits most rooms.

How the Planks Are Worked Out

  planks    =  room area × (1 + waste %) ÷ plank area, rounded up
  packs     =  planks ÷ planks per pack, rounded up
  rows      =  (room width − 2 × gap) ÷ plank width, rounded up
  last row  =  what is left after the full rows

Step-by-Step Example

A 5 × 4 m room, planks 1285 × 192 mm, 8 per pack, 10% waste, 10 mm gaps.

  Floor area:    5 × 4                          =  20.00 m²
  Plank area:    1.285 × 0.192                  =  0.2467 m²
  Planks:        20 × 1.10 ÷ 0.2467             =  89.2  →  90 planks
  Packs:         90 ÷ 8                         =  11.25 →  12 packs
  Rows:          (4000 − 20) ÷ 192              =  20.73 →  21 rows
  Last row:      0.73 × 192                     ≈  140 mm wide

A 140 mm last row is nearly three-quarters of a plank, which is fine. In a room 3.5 m wide the same planks would leave a last row of just 24 mm — the calculator then suggests ripping both the first and last rows to 108 mm instead.

Why the Last Row Matters

Laminate is laid in rows from one wall to the other, and the room is almost never an exact number of planks wide. Whatever is left over becomes the final row, cut lengthways. If it is very narrow, it is fragile, difficult to click into place against the wall and looks like a mistake.

The usual rule is to keep the last row at least a third of a plank wide. When it would be narrower, take the narrow strip plus one full plank width and split it between the first and last rows. Both edges end up the same width, and both look deliberate. It costs nothing extra in material — it only means ripping the first row before you start rather than discovering the problem at the end.

Waste, Offcuts and Staggering

Laminate wastes relatively little in a straight lay, because the offcut from the end of one row is used to start the next. The 10% allowance covers those end cuts, the occasional plank damaged in fitting, and the lengthways cut on the final row.

The offcut trick also gives a natural stagger. End joints in neighbouring rows should be at least 300 mm (12 in) apart, and should not line up every other row in a regular brick pattern. If an offcut is shorter than about 300 mm, set it aside and start the row with a fresh plank instead.

Allow 15% or more for a diagonal layout, or for rooms with bays, pillars, radiator pipes, many doorways or long runs of cupboards.

Expansion Gaps and Preparation

Laminate is a floating floor. It is not fixed to the subfloor, and its wood-fibre core swells and shrinks with humidity. It needs a gap — typically 8 to 10 mm — at every wall, pipe and door frame, hidden afterwards by skirting or beading. Large rooms and long runs may need an expansion profile part-way across; the manufacturer's instructions give the maximum run.

Leave the packs flat in the room for about 48 hours before fitting so the planks adjust to its temperature and humidity. Lay the planks on an underlay suited to laminate, with a damp-proof membrane over concrete, and check the subfloor is flat — most makers allow only about 2 to 3 mm of unevenness over a metre.

Which Way to Run the Planks

Planks usually look best running towards the main light source — parallel to light from the main window — because the joints between rows then cast little shadow. In long, narrow rooms and corridors, running them along the length makes the space look longer and needs fewer cuts. Whichever way you choose, measure the width across the planks for the row plan.

Understanding Your Result

Packs needed gives the whole packs to buy and the planks inside them.

Area shows the floor area and what the packs cover in total.

Rows shows how many rows fit across the room and the width of the last one.

First and last rows tells you whether to rip the first row, and to what width.

Worth knowing covers gaps and staggering.

When Should You Use This Calculator?

Before buying laminate, to order enough packs from one batch.

Before laying the first row, to see whether it needs ripping.

When choosing between plank widths, to compare pack counts and row plans.

Checking a fitter's quote.

Common Mistakes

Discovering a sliver at the last wall. Plan the rows first.

Forgetting the expansion gap. The floor buckles in humid weather.

Lining up the end joints. Stagger them by at least 300 mm.

Skipping acclimatisation. Planks move after fitting.

Buying exactly enough. Keep spare planks for repairs.