Wallpaper Roll & Pattern Repeat Calculator
Calculate how many wallpaper rolls you need from your wall dimensions and roll size, correctly accounting for pattern repeat and trim waste — not a flat
53cm × 10.05m is a commonly used "standard" European single-roll size — check your specific wallpaper's own label, since roll sizes vary by country and manufacturer.
Rolls needed
9
Strips needed
27
Cut length per strip
2.66 m
Strips per roll
3
This rounds each strip up to a full pattern-repeat length before dividing rolls into strips — the real source of "pattern waste," rather than a flat percentage guess. It doesn't account for doors, windows, or corners you may be able to use offcuts around, so treat the result as a working number to buy against, and always round up to the next whole roll when ordering.
About this tool
How to use it
- Measure and add up the total length of wall you're covering (skip subtracting doors/windows unless they're large, since offcuts often aren't reusable across a pattern match).
- Enter your wall height, and your specific wallpaper's roll width, roll length, and pattern repeat (all printed on the roll label or product page).
- Enter a trim allowance — a small amount added to each strip's length for trimming the top and bottom straight (10cm is a common starting point).
- Press Calculate Rolls Needed, or just keep typing — the result updates live.
- Always round up when buying, and consider one extra roll as a buffer for cutting mistakes or future repairs.
Why it matters
Patterned wallpaper needs to line up from one strip to the next, which means each strip has to be cut to a length that's a whole multiple of the pattern's repeat distance — not just cut to the wall height. That rounding-up is the real reason patterned paper 'wastes' more per strip than plain paper, and it's a genuine, calculable amount rather than a rule-of-thumb percentage.
When to use it
Useful before ordering wallpaper for a room, when comparing how many rolls two different patterns would need for the same wall (a larger pattern repeat generally needs more rolls), or when double-checking a quote from a decorator against your own numbers.
Good to know
This calculates the real waste caused by pattern matching — rounding each strip's length up to the next full pattern repeat — rather than applying a flat 'add 10%' guess some guides use. It doesn't account for offcuts you might successfully reuse around doors, windows, or short wall sections, corners that need extra care, or unusually large repeats that some rolls can't accommodate at all (check the 'too short to fit one strip' warning if that happens). Roll sizes vary meaningfully by country and manufacturer — the 53cm × 10.05m default here is a commonly used general reference, not a universal standard, so always confirm against your specific roll's label.
Common questions
What is a pattern repeat?
It's the vertical distance a wallpaper's pattern takes to repeat itself — printed on the roll label, usually in centimeters or inches. A larger repeat means more of each strip gets rounded up (and wasted) to keep the pattern aligned between strips, so patterns with a large repeat generally need more rolls for the same wall than a small-repeat or plain paper.
Why not just add a flat percentage for waste instead of calculating the repeat?
Because the actual waste depends on your specific wall height and pattern repeat together — a small repeat on a tall wall wastes very little, while a large repeat on a short wall can waste a lot, and a single flat percentage can't capture that relationship accurately. Rounding each strip up to a full repeat, as this tool does, reflects the actual cutting waste rather than a generic guess.
Should I subtract doors and windows from my wall length?
Many decorators don't, because the offcuts from around doors and windows often can't be reused elsewhere once the pattern has to match, so skipping the subtraction is a safer starting estimate — subtract them only if you're confident about reusing the cut pieces.
How much extra should I buy beyond the calculated number?
Many people buy one additional roll beyond the calculated total as a buffer for cutting mistakes, damaged rolls, or future repairs — dye lots can vary between production batches, so having a same-batch spare roll on hand is often more useful than trying to match a new batch later.