How much wallpaper and laminate does a room need: a calculator
Room size, windows and doors, roll width and pattern repeat – and you see the strips, rolls and packs of glue. For the floor: packs of laminate with a trimming reserve. Metric units.
Perimeter 2 × (4 + 3) = 14 m − openings 2.4 m = 11.6 m ÷ 1.06 = 11 strips. Strip 2.7 + 0.1 = 2.8 m; 10.05 ÷ 2.8 = 3 strips per roll. 11 ÷ 3 → 4 + 1 spare = 5 rolls. Glue: 31.5 m² ÷ 30 = 2.
Prompt sent to the chat: «Calculate the wallpaper for a renovation. Room 4 × 3 m, ceiling 2.7 m, windows – 1 of 1.5 m, doors – 1 of 0.9 m, roll 1.06 × 10.05 m, pattern matching: none. The calculator gave 11 strips and 5 rolls with a spare. Check the calculation and work out the other rooms the same way from the flat plan – I will attach a photo of the plan with the sizes.»
Take a photo of the flat plan – the AI counts all the rooms. Free on the Starter plan.
Calculate my flat from the planHow many rolls of wallpaper a room needs: a table
Wide wallpaper 1.06 × 10.05 m, one 1.5 m window and one 0.9 m door, no pattern matching, one spare roll. The figures come from the same calculator.
| Room | Floor area | Ceiling 2.5 m | Ceiling 2.7 m |
|---|---|---|---|
| 3 × 3 m | 9 m² | 510 strips, 3 per roll | 510 strips, 3 per roll |
| 3 × 4 m | 12 m² | 511 strips, 3 per roll | 511 strips, 3 per roll |
| 4 × 4 m | 16 m² | 613 strips, 3 per roll | 613 strips, 3 per roll |
| 4 × 5 m | 20 m² | 615 strips, 3 per roll | 615 strips, 3 per roll |
For a 12 m² room (3 × 4 m), take the number of rolls in the 3 × 4 row. With a ceiling up to 3.25 m a wide roll gives 3 strips, so 2.5 and 2.7 m need the same number of rolls. For 0.53 m rolls the count almost doubles.
How not to miscount the wallpaper
- 1
One batch
The shade can differ between batches. The batch number is on the label – take every roll with the same one.
- 2
The repeat eats length
With pattern matching each strip is longer, so a roll gives fewer strips. The repeat is on the label in centimetres.
- 3
Count strips, not area
Counting by room area understates the rolls: offcuts shorter than a strip are not used.
- 4
Trimming allowance
Add 10 cm to the height – 5 cm at the top and at the bottom. The calculator already does it.
- 5
A spare roll
It comes in for the pieces above the door and under the window, and to replace a spoilt strip.
How much wallpaper glue you need
The coverage is printed on the pack – in square metres or in rolls. The calculator divides the area to paste by that figure.
Roll 0.53 × 10.05 m
That is the glue one roll needs, by the area of the web.
Roll 1.06 × 10.05 m
A wide roll has twice the area and needs twice the glue.
Match your wallpaper
Non-woven, vinyl and paper wallpapers need different glue. The right type is on the roll label.
The calculator and a plan-based count are free
Starter – 0 ₽
The calculator on the page works without signing up. A photo of the plan and a count of all rooms in the chat are a text request, included in the free plan with 30 units of energy. For a big renovation there is Lite at ₽690 (150 energy) and Basic at ₽990 (200 energy).
FAQ
How do I work out how much wallpaper a room needs?
The room perimeter minus the width of windows and doors, divided by the roll width, is the number of strips. The roll length divided by the wall height plus allowance is the strips per roll. Divide the strips by the strips per roll and add one spare roll.
How many rolls of wallpaper does a 12 m² room need?
For a 3 × 4 m room with a 2.7 m ceiling, one window and one door, it is 5 wide rolls of 1.06 × 10.05 m including the spare. The exact number depends on the repeat and the openings: enter your own sizes.
How much wide wallpaper do I need?
About half as many rolls as with 0.53 m ones: the strip is wider and the roll length is the same. Pick the 1.06 × 10.05 m or the 1.06 × 25 m roll in the calculator.
How much glue does a roll of wallpaper need?
A wide roll is about 10.7 m² of web, a standard one about 5.3 m². The coverage per pack is printed on it: enter it in the calculator and it counts the packs.
How do I calculate laminate for a room?
Multiply the floor area by the reserve – 5–7% for a straight layout, 10–15% for a diagonal one – and divide by the area per pack. Round up to a whole pack.
Can I count a whole flat at once?
Yes, in the chat: send a photo of the plan with sizes or list the rooms. The AI counts wallpaper and laminate for each room and adds up the total.
Buy exactly as much as you need
No spare rolls gathering dust and no trip for a missing one from a different batch.
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