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Wallpaper Estimator

Rolls of wallpaper needed for a room.

Free to use, no sign-up required. Wallpaper Estimator is one of 198 tools built into Xenition, alongside a chat that can use them for you.

Works out how many rolls of wallpaper a room needs by counting the vertical strips around the walls and how many fit on each roll.

How to use Wallpaper Estimator

  1. Enter the Room perimeter (2 × (length + width) for a rectangular room) and the Wall height in metres.
  2. Enter the Roll width and Roll length from the label; the defaults are 0.53 m by 10 m, a common standard roll.
  3. Leave “Add 1 spare roll for pattern matching” ticked or untick it.
  4. Read Rolls to buy, with Strips needed and Strips per roll shown as the working.

How it works

Strips = perimeter ÷ roll width, rounded up. Strips per roll = roll length ÷ wall height, rounded down, since a short offcut cannot be a drop. Rolls = strips ÷ strips per roll, rounded up, plus one if the spare is ticked.

Example

An 18 m perimeter, 2.4 m walls and 0.53 × 10 m rolls: 18 ÷ 0.53 rounds up to 34 strips, each roll gives 4 strips, and 34 ÷ 4 rounds up to 9 rolls, or 10 with the spare.

Questions about Wallpaper Estimator

Why do I need a spare roll for patterned paper?

Each drop has to line up with the pattern of the one beside it, which wastes paper at the top of every strip. A larger pattern repeat wastes more, so one extra roll from the same batch is a common safeguard.

Should I subtract doors and windows?

This tool counts full-height strips around the whole perimeter and does not subtract them. The paper saved above a door is usually lost to trimming anyway.

Use it from chat

You do not have to open Wallpaper Estimator to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.

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