About WallpaperRoll
WallpaperRoll exists because wallpaper math punishes optimism with dye lots.
Wallpaper is the rare project where running one roll short costs more than the whole margin: replacement rolls come from a different dye lot, and the difference shows on the wall forever. The professional rule — measure twice, add margin, buy once — starts with honest roll arithmetic.
The calculators implement the installer math: drops per wall from roll dimensions, cuts per roll from pattern repeat, waste percentages by pattern type, and paste per roll. Every input matches what is printed on the roll label.
We are educators, not installers or retailers. Nothing here sells paper, and your wall measurements never leave your browser.
What makes WallpaperRoll different
- Your numbers never leave your browser. Every calculator on WallpaperRoll runs entirely on your device. We never see, store, or transmit the figures you enter — there are no accounts and no server-side processing of your inputs.
- Published methodology. Each calculator page explains the exact formula it uses and the assumptions behind it, so you can check our work or reproduce it in a spreadsheet.
- Free, forever, without a paywall. WallpaperRoll is supported by advertising. There is no premium tier, no email gate, and no upsell.
Independence
WallpaperRoll is an independent educational project. We are not affiliated with, endorsed by, or acting on behalf of any government agency, lender, insurer, or the organizations whose formulas and public data we reference (such as manufacturer roll standards and hanging-practice guidance). All trademarks and referenced standards belong to their respective owners.
Questions, corrections, or suggestions are genuinely welcome — get in touch.