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Wallpaper calculator

Enter the total wall perimeter, height and the roll details from its label. Add the pattern repeat and openings for a more useful estimate.

Planning estimate, not a wall-by-wall cutting plan. Door and window area is deducted proportionally; it does not model their position, corners or pattern alignment. Check the roll label and add a practical allowance.

How many wallpaper rolls do I need?

The estimate divides your adjusted wall run into strips, rounds each drop up to a full pattern repeat, adds a 10 cm trim allowance and counts how many drops fit in each roll. Add extra material for cuts, corners and mistakes.

Also planning paint? Use the paint calculator.

Frequently asked questions

How many wallpaper rolls do I need?

The estimate divides your adjusted wall run into strips, rounds each drop up to a full pattern repeat, adds a 10 cm trim allowance and counts how many drops fit in each roll. Add extra material for cuts, corners and mistakes.

Are my room measurements uploaded?

No. The calculation runs in your browser and does not send your measurements to a server.

Why does a pattern repeat increase the number of rolls?

Each strip may need to start at the same point in the design. The cut length is rounded up to a full repeat, so fewer strips may fit on each roll.

Does the estimate account for doors, windows and corners exactly?

No. Entered opening area is converted into equivalent wall width. The estimate cannot place openings, corners or pattern matches; measure each wall and check the manufacturer guidance before buying.