Show the formula and working
This laminate flooring calculator works out how many packs of laminate and rolls of underlay you need for a room, and what the flooring will cost, for homeowners and DIY fitters in the UK and Europe. Enter the room size, the coverage printed on one pack and a wastage level, and it rounds up to whole packs. Measurements work in metres or feet.
Quick answer: multiply room length by width, add wastage (10% suits most rooms), divide by the coverage of one pack and round up. The laminate flooring calculator shows a 4.5 m by 3.6 m living room needs 17.82 m² with wastage, which is 9 packs of 2.22 m² and 2 rolls of underlay.
What Is a Laminate Flooring Calculator?
A laminate flooring calculator is a tool that converts a room’s floor area into the number of laminate packs to buy, after adding an allowance for cutting waste and rounding up to whole packs.
The formula is: room area equals length times width. Area needed equals room area times one plus the wastage percentage. Packs equal area needed divided by the coverage of one pack, rounded up. Underlay rolls equal room area divided by roll coverage, rounded up, because underlay is laid wall to wall with very little waste.
Laminate is sold by the pack, not by the square metre, so the rounding step matters. The difference between the area you need and the area you buy is your real margin for mistakes. For background on how the boards are made, see the Wikipedia article on laminate flooring.
How Do You Use the Laminate Flooring Calculator?
- Measure the room length at its longest point, into any alcove or doorway you will floor, and enter it.
- Measure and enter the room width the same way. Switch to feet if your tape measure reads imperial.
- Type in the coverage per pack in m², printed on the pack label or product page. The laminate flooring calculator starts at 2.0 m² as an example.
- Choose wastage: 5% for a simple room, 10% for most rooms or 15% for many corners or a diagonal lay.
- Enter the coverage of one underlay roll, or 0 if your laminate has underlay attached.
- Add the price per pack if you want a cost, then read the packs, underlay rolls and working.
How Much Extra Laminate Should You Buy?
Buy about 10% more than the room area for most rooms, 5% for a plain rectangle and 15% for rooms with many corners or a diagonal lay.
Manufacturers give similar advice. Pergo says around 5% extra is usually enough for a standard room, with 10% for smaller rooms that need more cuts. Egger suggests 10% for waste and mistakes and 15% for patterned or tile effect boards. The laminate flooring calculator offers the same three levels, so you can match the setting to your room.
Waste comes from the cut at the end of every row, the narrow strip along the last wall and cuts around door frames and pipes. Long boards in a short room waste more, because each end cut is a bigger share of the board.
Rounding up to whole packs usually adds a little more on top. Check the flooring bought line in the results: if it is already well above the area with wastage, you probably do not need an extra pack.
Laminate Flooring Calculator Results by Room Size
These results come straight from the laminate flooring calculator with 10% wastage, packs of 2.22 m² and underlay rolls of 10 m². Use them to sense check your own numbers.
| Room size | Room area | Area with 10% wastage | Packs (2.22 m²) | Underlay rolls (10 m²) |
|---|---|---|---|---|
| 3 m x 2.5 m | 7.5 m² | 8.25 m² | 4 | 1 |
| 3.6 m x 3 m | 10.8 m² | 11.88 m² | 6 | 2 |
| 4.5 m x 3.6 m | 16.2 m² | 17.82 m² | 9 | 2 |
| 5 m x 4 m | 20 m² | 22 m² | 10 | 2 |
| 6 m x 4.5 m | 27 m² | 29.7 m² | 14 | 3 |
How Do You Measure an Irregular Room for Laminate?
Split the room into rectangles, multiply length by width for each, and add them together; then enter a length and width that give the same total, or run the laminate flooring calculator once per rectangle and add the packs.
- L shaped rooms: measure the two rectangles separately, without counting the overlap twice.
- Bay windows: treat the bay as a rectangle from the wall line to the deepest point of the bay.
- Doorways: measure to the centre of the door, where a threshold profile will sit.
- Fitted kitchens: most people stop at the plinths, but measure under any freestanding appliance.
- Hallways: measure each straight section and add a little extra wastage for the many cuts.
Do not reduce your measurements for the expansion gap. The boards are cut to leave the gap, so the full wall to wall size is correct.
What Expansion Gap Does Laminate Flooring Need?
Laminate needs an expansion gap of about 8 to 10 mm around every wall, pipe and fixed object, which is what Quick-Step specifies for its laminate floors.
Quick-Step also says a floor can run up to 13 m without an expansion joint in a room that is roughly square and has stable temperature and humidity. Larger floors need a break. Its laminate installation guide recommends keeping end joints at least 30 cm apart between rows, and a last row at least 5 cm wide.
The gap is hidden by skirting board or scotia beading. Our skirting board calculator works out the lengths needed for the room. Brands differ, so always follow the fitting instructions for your floor.
Worked Example: Tom Lays Laminate in a 4.5 m by 3.6 m Living Room
Tom in Nottingham is laying oak effect laminate in his living room, which measures 4.5 m by 3.6 m. The packs cover 2.22 m² each and cost £42. The room is a plain rectangle with one door, so he chooses 10% wastage. His underlay comes in 10 m² rolls. He enters everything into the laminate flooring calculator.
- Area: 4.5 m x 3.6 m = 16.2 m²
- With wastage: 16.2 x 1.10 = 17.82 m²
- Packs: 17.82 / 2.22 = 8.03, rounded up to 9
- Flooring bought: 9 x 2.22 = 19.98 m²
- Underlay: 16.2 / 10 = 1.62, rounded up to 2 rolls
- Cost: 9 x £42 = £378.00
The ninth pack is only just needed, since 8 packs give 17.76 m². Tom buys 9, which leaves him nearly 2.2 m² spare for repairs.
What Are the Most Common Laminate Buying Mistakes?
The most common mistake is buying exactly the room area with no wastage, which almost always leaves you one pack short on the last row.
- Mixing batches: check the batch code on every pack, as shades can differ.
- Skipping acclimatisation: Quick-Step asks for packs to rest unopened in the room for 48 hours at 15 to 22°C.
- Forgetting profiles: you need threshold strips at doorways and scotia or skirting at the walls.
- Wrong underlay: on concrete, use underlay with a damp proof membrane, as the fitting instructions require.
- Underfloor heating: check the board is approved for it. Our underfloor heating calculator sizes the system.
Also think about the room before you buy. Standard laminate has a fibreboard core, so check whether your chosen range is rated for kitchens or bathrooms. For a wet room or a bedroom where you prefer something softer, compare the cost with our vinyl flooring calculator or carpet calculator, then come back to the laminate flooring calculator to finalise the order.
Laminate Flooring Calculator FAQs
How many packs of laminate do I need for a 4 m by 3 m room?
A 4 m by 3 m room is 12 m². With 10% wastage you need 13.2 m², so with 2.22 m² packs that is 6 packs. Enter your own pack coverage in the laminate flooring calculator, as pack sizes vary.
Should I add 10% or 15% wastage for laminate?
Use 10% for most rooms with a few cuts and one or two doors. Choose 15% for rooms with many corners, bay windows, pipes or a diagonal lay, and 5% only for a simple rectangle with short boards.
How much underlay do I need for laminate?
You need underlay equal to the room area, as it is laid edge to edge with little waste. Divide the room area by the coverage of one roll and round up. Skip it if your boards have underlay already attached.
Do I deduct the expansion gap when measuring?
No. Measure wall to wall. The boards are cut to leave the gap, and the cut pieces count as wastage. Deducting the gap could leave you short of flooring at the end of the job.
Can I return unopened packs of laminate?
Many UK retailers accept unopened packs within a set period, but policies differ. Check before you order. A spare pack is useful for future repairs, because the same shade may be hard to find later.
Does the laminate flooring calculator work in square feet?
Yes. Switch to imperial to enter the room in feet and pack coverage in square feet. The laminate flooring calculator converts it and still rounds up to whole packs and underlay rolls.
Checked October 2026. Sources: Quick-Step laminate installation guide and FAQ, Quick-Step installation instructions, Pergo help centre, Egger UK flooring guide, Wikipedia: Laminate flooring.