Wallpaper Calculator
How many rolls for your room — with the pattern-match waste built in, so you buy once from one dye lot instead of scrambling for a mismatched top-up.
Wallpaper is easy to under-order because the pattern repeat quietly eats into every roll. This calculator accounts for it: net wall area, strips per roll after pattern alignment, and the roll count rounded up — so you buy the right amount from one dye lot the first time.
For paint instead, use the Paint Calculator; to total the wall areas across a whole room or floor, the Square Footage Calculator helps.
FAQ
- How many rolls of wallpaper do I need?
- It depends on wall area, roll size, and the pattern repeat. The calculator nets out doors and windows, works out how many full-height strips you get per roll once the pattern is aligned, and divides your total strips by that — rounding up to whole rolls.
- Why does the pattern repeat matter so much?
- A repeat forces you to trim each strip so the design lines up with its neighbor, wasting part of every strip. A large repeat can mean a full extra roll or two. A 'random match' or 'free match' paper has a 0 repeat and the least waste.
- Should I order extra?
- Yes — always buy all rolls at once from the same batch (check the run/lot number) and keep at least one spare. Color varies between print runs, so a later top-up roll may not match.
Related tools & guides
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Real-room inspiration that uses this tool's outputs.