Wallpaper Calculator
How many rolls of wallpaper a room needs, with doors and windows deducted and the pattern repeat accounted for properly: the repeat decides how long each drop has to be cut, and that decides how many drops fit on a roll.
Roll, pattern and openings
Wall 1
- Area to paper
- 7.51 m²
- gross 10.80 − openings 3.29
- Drops needed
- 9
- 4.50 m ÷ 0.530 m roll width
- Cut length
- 2.43 m
- wall 2.40 + trim
- Drops per roll
- 4
- 10.05 m roll ÷ 2.43 m
Drops needed
9
Rolls to buy
3
Drops per roll
4
Waste
27%
Roll by roll
Rolls to buy comes from packing every drop cut length into whole rolls, dropping the longest first — the leftover on each roll is the offcut you keep for patching.
- Roll 19.73 / 10.05 m
- Roll 29.73 / 10.05 m
- Roll 32.43 / 10.05 m
- Wall area
- 7.51 m²
- Wallpaper bought
- 15.98 m²
- % of rolls wasted
- 27.4%
Drops across each wall
Each wall is drawn to scale with its drops, the pattern repeats above the first drop, and the openings the paper runs behind.
Dashed violet lines divide the wall into drops; amber lines mark each pattern repeat above the first, which is the waste a straight or offset match forces you to buy. Amber and blue openings are doors and windows that the drops run behind and are trimmed around.
About this tool
It works out the drops each wall needs from the roll width, deducts doors and windows from the wall area, then rounds every drop cut length up to a whole pattern repeat — the step most quick calculators skip, and the reason a straight or half-drop match needs noticeably more paper. Drops are packed into whole rolls with a first-fit-decreasing pass, so rolls to buy reflects real offcuts rather than a rough division. Metric and imperial both work. Everything is computed in your browser; nothing is sent anywhere.
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is Wallpaper Calculator really free?
Yes. Wallpaper Calculator is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does Wallpaper Calculator upload my data?
No. Wallpaper Calculator runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and Wallpaper Calculator is ready to use on desktop or mobile.
Does Wallpaper Calculator work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
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