Wallpaper calculator

Count full wallpaper drops and rolls, rounding each drop up to your pattern repeat.

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Wallpaper calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Wall width

Wall height

More inputs and assumptions

Roll width

Roll length

Pattern repeat (0 for none)

Trim allowance per drop

Answer

…

Count full wallpaper drops and rolls, rounding each drop up to your pattern repeat.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Use one length unit. Assumes straight-match repeat, one rectangular wall and full-height drops. Half-drop patterns, openings, damaged sections and mixed walls require a separate layout.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Scratch calculator

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Updated 2026-09-26

Using Wallpaper calculator

Count full wallpaper drops and rolls, rounding each drop up to your pattern repeat.

Use one length unit. Assumes straight-match repeat, one rectangular wall and full-height drops. Half-drop patterns, openings, damaged sections and mixed walls require a separate layout.

Next: Paint calculator

A worked example

Example inputs: wall width = 4, wall height = 2.4, roll width = 0.5, roll length = 10, pattern repeat (0 for none) = 0.6, trim allowance per drop = 0.1. Rolls needed = 3.

Before you use the result

Use one length unit. Assumes straight-match repeat, one rectangular wall and full-height drops. Half-drop patterns, openings, damaged sections and mixed walls require a separate layout.

Example results for wall width

These examples use Wall height: 2.4; Roll width: 0.5; Roll length: 10; Pattern repeat (0 for none): 0.6; Trim allowance per drop: 0.1. They are reference calculations, not recommended settings.

Wall width	Rolls needed
2	2
4	3
8	6

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ToolOctopus. “Wallpaper calculator.” Updated 2026-09-26. https://tooloctopus.com/wallpaper-calculator.

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