How many rolls of wallpaper?
Wallpaper isn't bought by area — it's bought by the roll, and a pattern repeat can swallow far more than you'd expect. This works it out the way a decorator does, by drops, so you order the right number and the batch matches. Free, no sign-up.
Roll size — standard UK roll by default
A guide, not a guarantee. It assumes every drop runs full height and only deducts doors (you still paper above and below windows). A large pattern repeat, a design that has to be matched across each width and any mistakes all use more — buy from the same batch number and keep a spare roll, as ranges and dye lots change. Paste, lining paper and tools are extra. Nothing you type leaves your browser.
Why decorators count drops, not area.
A "drop" is one full-height strip. We measure the distance around the room, divide by the roll width to get how many drops it takes to go round, then work out how many drops you get from a roll once each one is cut to your wall height. Round up the rolls, because a part-roll left over rarely stretches to a whole extra drop.
The pattern repeat is the catch. If the design has to line up, every drop has to start at the same point in the pattern — so you trim off up to a full repeat from each strip to match it. That's wasted paper, and it's why a big repeat can push you from, say, four drops a roll down to three. Plain or "random match" papers have no repeat, so they go furthest. The figure's on the roll label.
Always buy the same batch. Wallpaper is printed in batches, and the colour can shift very slightly between them. Buy all your rolls in one go with the same batch number, and get one spare — if you run short later, a new batch may not match the wall you've already done.
Feature wall? Switch to one-wall mode and we use the room length as the wall to paper. For an odd-shaped wall, measure its width directly and pop it in as the length with the width set to 0.
Keep every room's details in one place.
Stead remembers your rooms and their sizes, the wallpaper and paint you chose, and when each room was last done — so your next decorating project starts with the numbers, not a tape measure and a guess.