Enter your wall size and roll dimensions to find out how many rolls of wallpaper you need — accounting for pattern repeat, waste, and total cost.
Wallpaper is hung in full-height vertical strips, so the math is about strips, not raw square footage. You work out how many strips you can cut from one roll, how many strips it takes to go around the room, and divide. Pattern repeat eats into each roll because you have to trim strips to line the design up — this calculator factors that in for you.
1. Strips needed = total wall width ÷ roll width (rounded up).
2. Usable strip length = wall height + pattern repeat allowance (so the pattern lines up).
3. Strips per roll = roll length ÷ usable strip length (rounded down).
4. Rolls = strips needed ÷ strips per roll (rounded up).
With a plain paper, every inch of the roll is usable. But with a large pattern repeat, each strip has to start at the same point in the design, so you trim and discard up to one repeat's worth of paper per strip. A big repeat can easily push you from 5 rolls up to 6 or 7 — always check the repeat on the label before buying.
| Roll type | Typical size | Notes |
|---|---|---|
| 🇺🇸 US single roll | ~21 in × 33 ft | Often sold as double rolls |
| 🇬🇧 UK / Euro roll | ~53 cm × 10 m | The common standard |
| 🖼️ Peel & stick | Varies widely | Check the specific product |
Always round up to whole rolls and grab at least one extra, ideally with the same batch (lot) number — colors shift slightly between print runs, so a later top-up roll may not match the walls you've already hung.