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Wallpaper Roll Estimator
Calculate exactly how many rolls of wallpaper you need, factoring in pattern repeat.
Instant result
Plain-English why
Copyable takeaway
What this means
This calculates the number of strips needed, accounts for pattern repeat waste per strip, and calculates how many strips fit in a roll. It always adds 1 spare roll.
Formula used
strips = ceil(perimeter / width). strips_per_roll = floor(usable_roll_len / effective_strip_len).
Worked example
For a 4.5x3.5m room with 2.4m ceiling and 53cm pattern repeat, you need 11 rolls plus 1 spare = 12 rolls.
Common questions
Can I use this internationally?
Yes. Currency selectors are display-only unless a tool explicitly says otherwise; no currency conversion is performed.
How exact is the result?
It follows the published Technofatty formula for this tool, but real life can add fees, rules, timing quirks, and context.
Plain-English summary
You need 11 rolls, plus 1 spare roll included. Net wall area: 31.4m².
This section translates the result into a short, direct takeaway rather than leaving the page at a bare number.
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