How many rolls do I need for a room?

It depends on the wall area. A 4 m × 3 m room with 2.5 m walls usually needs about 7 standard rolls.

What is a pattern repeat?

The distance before the pattern repeats. Larger repeats waste more paper when matching.

Yes. Keep a spare roll for repairs, and buy all rolls from the same batch.

Enter the room's length, width and height, and the number of doors and windows, to see how many rolls to buy.

Length

Width

Height

Doors

Windows

Waste allowance

Calculate how many wallpaper rolls you need based on room dimensions and roll size — for interior decorating.

Rolls = (room perimeter × wall height × waste factor) ÷ roll area. A 10% waste allowance is applied for standard rooms.

Common questions about Wallpaper Calculator

We use the standard published formula for this calculation, and we show the working so you can check it.

Spotted a mistake? Tell us and we'll check it within a few days. See how we check our calculators.

DIY disclaimer

Estimates only. Buy a little extra, measure your actual space, and check product labels and local building rules.