About this site
Nine estimating sheets for wallpaper rolls, mural panels, decorative wall panels, and wainscoting, built the way an installer counts and owned by nobody who sells paper.
Why it exists
Search for a wallpaper calculator and nearly every result belongs to a retailer or a brand. Those tools are built to put a quantity in a cart, and they simplify in the same three places: they divide area by a fixed coverage instead of counting drops, they skip or bury the pattern repeat, and they never explain that a roll priced as a single is sold as a double. Each of those simplifications tends to make the number smaller than it should be, and running out of a discontinued dye lot two rolls short is the worst outcome a wallpaper job can have.
This site does the arithmetic the long way and shows it. Every page draws the roll being used up, prints the working under the count, and puts the area method beside the strip method so you can see them disagree on your own walls.
What the sheets are
- Wallpaper Calculator — multi-wall strip method.
- Accent Wall Calculator — single-wall strip method.
- Wallpaper Mural Calculator — panel grid.
- Peel and Stick Wallpaper Calculator — strip method with peel presets.
- Wallpaper by the Yard Calculator — linear yardage.
- Ceiling Wallpaper Calculator — plane strip method.
- European Wallpaper Roll Calculator — metric strip method.
- Wall Panel Calculator — panel grid with gaps.
- Wainscoting Calculator — linear run and height.
Each one has its own inputs and its own formula. A ceiling is a plane, a mural is a set of panels, grasscloth is sold by the yard, and wainscoting is boards and a rail: forcing all of them through one roll calculator is how the wrong quantity gets ordered.
What it will not do
- Sell you anything, or link you to a cart.
- Quote a price. Prices change weekly. The arithmetic does not.
- Promise the count. Every figure is an estimate that depends on the label in your hand. Check the roll's width and length and its repeat against the label before ordering, and buy the whole order from one dye lot.
- Estimate stairs. A stair run is a raked, stepped layout that needs its own geometry.
Sources
Roll dimensions and packaging habits come from what manufacturers and retailers print on labels and in their own estimating notes. Where they disagree, the guides say so and name both practices. Waste allowances follow the trade range of about 10% for plain jobs and 15–20% for large repeats. Nothing on the site is drawn from a survey or a customer count, because we do not have one.
Corrections
If a figure here disagrees with a label you are holding, tell us which page. Corrections from people mid-job are the most valuable thing this site receives.