Wallpaper Calculator
Estimate the drops, rolls, waste and coverage needed to wallpaper a room from its wall length and height, roll dimensions and pattern repeat — with an optional cost estimate.
Input
Metric enters walls in metres and rolls in centimetres; imperial uses feet and inches.
metres in metric, feet in imperial. Sum of all wall lengths to be papered.
metres in metric, feet in imperial.
centimetres in metric, inches in imperial. Standard European roll is 53 cm; US rolls are commonly 20.5 in.
centimetres in metric, inches in imperial. Standard European roll is 1005 cm (10.05 m); US rolls are commonly 396 in (33 ft).
centimetres in metric, inches in imperial. Vertical distance the pattern repeats — 0 for a plain or non-repeating wallpaper.
Extra drops for cuts around doors/windows, pattern matching and touch-ups.
Optional. Leave blank to skip the cost estimate.
Output
| Metric | Value |
|---|---|
| No data yet | |
One-line overview of drops (with wastage) and rolls to buy.
More ways to use this tool
REST API
curl -X POST https://api.iotools.cloud/v1/tool/wallpaper-calculator \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"unitSystem": "metric",
"perimeter": "16",
"wallHeight": "2.4",
"rollWidth": "53",
"rollLength": "1005",
"patternRepeat": "0",
"wastagePct": "10",
"pricePerRoll": "25"
}'Swap in your own key from your account. The tool's fields are the body — no wrapper.
Ask an AI agent
Use the IOTools `wallpaper-calculator` tool (Wallpaper Calculator) on this input:
YOUR_INPUT_HEREPaste this at any agent connected to the IOTools MCP server, then add your input.
Embed widget
<iframe
src="https://iotools.cloud/embed/wallpaper-calculator/"
width="100%" height="520" frameborder="0" scrolling="no" loading="lazy"
title="Wallpaper Calculator — iotools.cloud"
sandbox="allow-scripts allow-forms allow-same-origin allow-downloads allow-popups allow-popups-to-escape-sandbox"
allow="clipboard-write"
style="width:100%;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden"></iframe>
<script src="https://iotools.cloud/embed.js" async></script>Drop this into your own page — free, no key required, just a link back.
| Cost per API/MCP call | From 5 credits |
|---|---|
| Need more credits? | View pricing |
Also available with
Guides
The Wallpaper Calculator works out how many drops (vertical strips) and rolls you need to paper a room, from the wall length and height, your roll's dimensions, and its pattern repeat — the number that decides how much length is wasted matching the pattern between drops.
How to use it
- Pick your unit system — metric (metres, centimetres) or imperial (feet, inches).
- Enter the room perimeter (the total length of wall to be papered) and the wall height.
- Enter your roll width and roll length — check the label on the roll; a standard European roll is 53 × 1005 cm, a standard US roll is about 20.5 × 396 in.
- Enter the pattern repeat if the wallpaper has one (0 for a plain paper). Every drop has to start at the same point in the pattern, so a repeat rounds each drop's usable length up to the next multiple of it — wasting a bit more per drop the larger the repeat.
- Adjust the wastage % for cuts around doors and windows, pattern matching and touch-ups, and optionally enter a price per roll for a cost estimate.
The result table gives the wall length, the drop length, the number of drops needed (with and without wastage), how many drops fit on one roll, and the number of rolls to buy — plus the total coverage and cost of that purchase.
Why does a bigger pattern repeat mean more rolls?
Every drop must line up with the one next to it, so each drop's cut length has to round up to a whole multiple of the repeat rather than stopping exactly at the wall height. A large repeat (a big floral print, for example) can waste most of a roll's length per drop and push you to buy more rolls than the wall height alone would suggest — the calculator accounts for this automatically instead of assuming zero waste.
Does this account for doors and windows?
Not as a separate deduction — the offcut lost above a door or beside a window is usually still usable elsewhere as a short drop, so it doesn't reliably shrink the roll count the way it would for something used up outright, like paint. The wastage % input is what absorbs those cuts; raise it for a room with several openings.
Everything runs in your browser; no dimensions are sent to a server. For paint quantities on the same walls, see the Paint Coverage Calculator; for flooring instead of walls, see the Floor / Tile Area Calculator.