Flooring Calculator
Work out the floor area, waste allowance, and exact packs of laminate, LVT, or vinyl flooring you need to buy.
Floor area is 20.00 m²; with 10% waste that's 22.00 m². At 2.20 m² per pack, you need 10 packs.
Results update as you type. The pack count rounds up because partial packs aren't sold; modest leftover stock is useful for future repairs.
Formula
Floor area is the simple multiplication
length × width. Add a waste allowance:
area × (1 + waste% / 100). Divide by the
pack's coverage and round up — partial packs don't sell, and a small surplus is invaluable
for future repairs.
When this calculator helps
Buying flooring is one of those jobs where a small measuring error turns into a real headache. This calculator is for the moment before you place the order: you have measured the room, you know the pack coverage off the label, and you want to know exactly how many packs of laminate, LVT or engineered wood to put in the basket. It takes the length and width in metres, works out the floor area in square metres, adds a waste allowance for cuts, and divides by the coverage of one pack — rounding up, because no UK retailer sells you half a pack.
It is built for the questions a DIY-er or a fitter actually asks at the merchant's counter: will eight packs cover the lounge, or do I need nine; how much extra do I order if I am laying the boards diagonally; is one spare pack worth it for future repairs. Because you set the waste percentage yourself, you can size the order tightly for a simple square room or generously for one full of alcoves and a bay window.
How to read your result
The calculator gives you two areas and a pack count. The first area is the bare floor — length times width in square metres. The second is that area with your waste allowance added on top, and it is the one that drives the order, because every cut you make leaves an offcut you usually cannot reuse. The pack count is the area-with-waste divided by the coverage of a single pack, always rounded up to the next whole pack.
If the result lands just over a whole number — say 8.1 packs, rounded to 9 — you will have most of a pack spare, which is normal and useful. Keep the leftover sealed; it is your repair stock from the right dye batch. If the figure sits well below the next pack, you have comfortable headroom and may not need an extra. Treat the pack count as the minimum to buy, not a target to trim down to.
A worked example
Take a rectangular living room that measures 4 metres by 5 metres. The bare floor area is 20 m². Laying laminate square in a tidy room, you allow the standard 10% for waste, which lifts the figure to 22 m². If each pack covers 2.2 m², you divide 22 by 2.2 to get exactly 10 packs — so you would order 10. Now suppose the same room has a bay window and you decide to lay the planks diagonally: bump the waste to 15%, and 20 m² becomes 23 m², which at 2.2 m² a pack is 10.45 packs, rounded up to 11. One extra pack for the more demanding job.
Common mistakes to avoid
Most flooring shortfalls come from skipping the waste allowance or measuring the room as if it were a perfect rectangle when it is not.
- Forgetting to add 5–10% for cuts, then running short on the last row and having to wait for a second delivery.
- Ignoring the plank direction — a diagonal or herringbone lay generates far more offcuts than a straight, square lay, so it needs a bigger allowance.
- Leaving out alcoves, bay windows and the threshold into doorways, which all add area and awkward cuts the simple length-by-width misses.
- Buying packs from two different batches on separate trips — laminate colour and finish drift slightly between production runs, and a patched-in batch can show under daylight.
UK buying notes
UK flooring is sold by the pack with the coverage printed on the side in square metres, so always work from the box label rather than a 'rough' figure on the retailer's website — the nominal number online is often optimistic. Click-laminate and LVT usually need an underlay bought separately and worked out from the same floor area, unless the product has integrated backing. Skirting, scotia and threshold strips are priced by the linear metre, not by area, so measure the perimeter and doorways for those rather than reusing the m² figure.
It is worth adding one extra sealed pack to most orders. Major UK sheds and flooring specialists will refund unopened packs but rarely take back opened ones, so an unused pack is low-risk insurance — and if a board is damaged in a few years, a spare from the same dye batch saves a far bigger job later.
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Frequently asked questions
How much waste should I allow?▾
10% is the standard rule of thumb for laminate and LVT laid square in a rectangular room. Bump to 12–15% for: diagonal lay, herringbone, strong pattern matching, or rooms with awkward features (alcoves, bay windows, lots of obstacles). For tiles in a complex space, allow 15–20%. The waste covers offcuts you can't reuse, plus a small reserve for future repairs.
Where do I find pack coverage?▾
On the side of every flooring pack, usually in m². Typical figures: laminate ~2.0–2.5 m²/pack, LVT (luxury vinyl tile) ~2.6–3.5 m², engineered hardwood ~1.6–2.4 m², ceramic tiles vary widely (often 0.9–1.5 m² per box). Don't trust a 'rough' figure off a website — the box label is the only one that counts.
What's the difference between m² and linear metres?▾
Floor area is m² (square metres). Some carpet and roll vinyl is sold in linear metres at a fixed roll width (typically 4 m or 5 m). For roll goods, calculate: linear metres = ceil(longer-room-dimension / roll-width) × shorter-dimension. This calculator handles tile/plank flooring sold by m² coverage; linear-metre roll goods need a different calculation.
Should I buy an extra pack 'just in case'?▾
Probably yes, especially for laminate or LVT. The 10% waste figure assumes typical losses; if a plank gets damaged in 5 years and you need a replacement, having a sealed pack from the same dye batch saves a lot of grief. Stores often won't take back opened packs but will refund unopened ones — so adding one pack to the order is low-risk insurance.
Does this work for tiled floors?▾
Yes, with a higher waste allowance — bump it to 15–20% for tiles. Tile breakage during cutting is more common than plank or LVT, and matching dye lots is harder. Pack coverage on tiles is usually given per box on the manufacturer label.
Do I need underlay?▾
Underlay is sold separately for laminate and engineered floors (and sometimes LVT). Calculate it from the same floor area — typically one roll covers 8–15 m² depending on type. Some products are 'integrated underlay' with a backing already attached; check the box.