Wallpaper Calculator
Work out how many rolls of wallpaper you need. Enter the room size, plus the roll size and any pattern repeat.
Standard UK roll is 10.05 m × 0.53 m. A pattern repeat means each drop is cut to the next full repeat, so more repeat = more waste. Rolls are not reduced for doors/windows, that keeps a safety margin and matches how decorators order.
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See OptiFlow Merchant →Estimate only, always confirm quantities with your merchant before ordering.
How to use the wallpaper calculator
Enter your wall dimensions and the calculator estimates how many standard rolls you need, allowing for the pattern repeat and trimming waste. A standard UK roll is roughly 10.05 m long and 0.53 m wide, which yields a set number of full drops depending on your ceiling height.
Frequently asked questions
How many rolls of wallpaper do I need?
Work out how many full drops you get from one roll at your wall height, then how many drops your walls need in total, and divide. Add a roll for pattern matching on patterned papers.
How does pattern repeat affect quantity?
A larger pattern repeat means more trimming waste per drop, because each length is cut to line up the pattern, so patterned papers need more rolls than plain.
Should I buy extra wallpaper?
Yes, add at least one roll, and buy every roll from the same batch number so the colour matches exactly.