Wallpaper Calculator

Estimate wallpaper rolls, usable drops per roll, wall coverage, and pattern-repeat waste from room dimensions and roll size.

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Wallpaper planning tool Estimate rolls, strips, and pattern waste before you order. The result updates as you type.

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Switch the cost display currency without changing the wallpaper maths.

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Room dimensions

Room length (ft) Room width (ft)

Ceiling height (ft)

Doors & windows

Number of doors Number of windows

Roll specifications

Roll width (in) Roll length (ft)

Pattern repeat (in, 0 = none) Unit price (optional)

Enter values Provide room dimensions and roll specifications to estimate wallpaper needed.

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Wall Covering Estimating

Wallpaper roll count, strip count, and pattern-repeat planning

A wallpaper calculator helps you estimate how many rolls a room needs before you order. It uses room dimensions, roll width, roll length, and pattern repeat to translate wall perimeter into strip count and then into a practical roll quantity with repeat waste taken into account.

About this calculator

Reviewed March 2026

Methodology

Calculates room perimeter from length and width, derives gross wall area from ceiling height, subtracts standard opening deductions, estimates strips needed from roll width, adjusts strip length for pattern repeat, and converts usable strips per roll into a final roll count.

Limitations

Assumes a simple rectangular room and uses standard planning deductions for doors and windows
Does not model half-drop matching, sloped ceilings, stairwells, feature walls, or irregular openings
Actual manufacturer roll yield and hanging guidance may differ from a general planning estimate

Disclaimer

Use this as a wallpaper-order planning estimate only. Confirm the final roll count against the wallpaper product label, match type, and supplier guidance before ordering.

Sources

Graham & Brown measuring guide — Manufacturer measuring guide used as context for room measurement workflow and strip-planning assumptions.
Graham & Brown hanging wallpaper guide — Manufacturer installation guide used as context for pattern matching, trimming, and practical hanging considerations.
Graham & Brown wallpaper buying guide — Manufacturer buying guide used as context for wallpaper ordering, roll selection, and practical extra-roll advice.

See our calculation methodology and editorial standards for how this estimate is produced.

How wallpaper roll estimates work

Wallpaper is usually ordered by roll, but the real planning problem is strip count. The room perimeter determines how many strips you need, while the roll width determines how many inches of wall each strip covers. A wallpaper calculator therefore uses both perimeter and roll width rather than just total square footage.

The roll length then determines how many full drops each roll can yield. If the wallpaper has a pattern repeat, each strip may need to be cut longer than the wall height so the pattern lines up, which reduces the number of usable drops per roll and increases the total roll count.

Why pattern repeat changes the order

If a wallpaper has a repeat, each strip must be cut to a repeat-friendly length rather than to the exact wall height. When the wall height does not divide neatly into the repeat interval, some of each strip becomes unavoidable trim waste.

That is why a wallpaper roll calculator often shows a bigger effect from pattern repeat than from small door and window deductions. Openings reduce wall coverage, but pattern repeat changes the usable strip yield from every roll.

How to use the result

Use the roll count as your ordering baseline, then compare it with the product label, match type, and supplier advice. A small extra allowance is usually sensible when the room has awkward corners, a feature wall, or a large repeat that makes cutting waste more expensive.

Order all wallpaper from the same batch or dye lot where possible. Even a perfect roll estimate cannot solve colour variation between batches, and future repairs are much easier if one spare roll is kept back from the original order.

Frequently asked questions

How many rolls of wallpaper do I need for a room?

Start with the room perimeter and wall height, then account for roll width, roll length, and any pattern repeat. A wallpaper calculator converts that into strips needed, strips per roll, and the final roll count.

Why does pattern repeat affect wallpaper quantity?

Pattern repeat forces each drop to be cut to a repeat-friendly length rather than to the exact wall height. That reduces the number of usable drops each roll can produce and often increases the total rolls needed.

Do doors and windows eliminate the need for extra wallpaper?

Not always. Openings reduce net wall area, but strip count still follows the room perimeter and roll width, so the saving is often smaller than people expect.

Should I order an extra wallpaper roll?

Usually yes. One spare roll from the same batch is a practical safeguard for trimming mistakes, damaged drops, and future repairs.

Wallpaper Calculator

Wallpaper roll count, strip count, and pattern-repeat planning

How wallpaper roll estimates work

Why pattern repeat changes the order

How to use the result

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