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Wallpaper Calculator

Works out how many rolls of wallpaper a room needs, accounting for the pattern repeat that is wasted on every drop.

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Enter your figures and press Calculate.
In short Wallpaper Calculator is a free online tool on inputtesthub.com that works out how many rolls of wallpaper a room needs, accounting for the pattern repeat that is wasted on every drop. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Wallpaper Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Wallpaper Calculator

The Wallpaper Calculator works out how many rolls of wallpaper a room needs, accounting for the pattern repeat that is wasted on every drop. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Ordering wallpaper for a bedroom.
  • Working out the cost of a patterned paper versus a plain one.
  • Checking a decorator’s roll count.

Details

Standard European roll10.05 m × 53 cm
Covers, plain≈ 5 m²
Free matchNo repeat wasted
Large repeatCan cost a whole extra roll

The maths behind it

This tool uses Drops needed = perimeter ÷ roll width. Length per drop = wall height + pattern repeat. Drops per roll = roll length ÷ length per drop, rounded down. Every intermediate value is shown on screen, so the result can be checked by hand.

Doors and windows are not deducted from the roll count on purpose. You still cut a full drop and trim around the opening, so the paper is used either way — deducting the opening is how people end up one roll short.

Frequently asked questions

Are there any usage caps on the Wallpaper Calculator?
There is no cost and no cap. The Wallpaper Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Is what I paste into the Wallpaper Calculator stored?
No. The Wallpaper Calculator runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What formula does the Wallpaper Calculator use?
It uses Drops needed = perimeter ÷ roll width. Length per drop = wall height + pattern repeat. Drops per roll = roll length ÷ length per drop, rounded down. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What is the Wallpaper Calculator used for?
Typical uses: ordering wallpaper for a bedroom. Working out the cost of a patterned paper versus a plain one. Checking a decorator’s roll count. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Any caveats I should know about?
Doors and windows are not deducted from the roll count on purpose. You still cut a full drop and trim around the opening, so the paper is used either way — deducting the opening is how people end up one roll short.
What are the reference figures here?
Standard European roll is 10.05 m × 53 cm. Covers, plain is ≈ 5 m². Free match is No repeat wasted. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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