Wallpaper Roll Calculator
Rolls needed from wall width, height and the pattern repeat — the drop-matching math done right.
A 64 cm repeat can waste a third of every roll — that's why the same room needs 6 plain rolls but 9 patterned ones. Always buy every roll from one batch number; dye lots differ visibly.
Formula
Wallpaper Roll Calculator is a free wallpaper calculator for civil engineers, contractors and quantity surveyors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Wallpaper Roll Calculator
Rolls needed from wall width, height and the pattern repeat — the drop-matching math done right. The calculation implements drop = height + repeat; strips/roll = ⌊roll length ÷ drop⌋; rolls = ⌈strips ÷ strips-per-roll⌉ (Wallcovering industry estimating practice (WA/UK)). A 64 cm repeat can waste a third of every roll — that's why the same room needs 6 plain rolls but 9 patterned ones. Always buy every roll from one batch number; dye lots differ visibly.
How to use Wallpaper Roll Calculator
- 1Enter Total wall width (all walls) in m.
- 2Enter Wall height in m.
- 3Enter Roll width in m (Euro roll 0.53 m; US 0.69 m).
- 4Enter Roll length in m.
- 5Read Rolls to buy, Strips needed, Strips per roll instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Wallpaper Roll Calculator?
- ✓Implements the standard formula — drop = height + repeat; strips/roll = ⌊roll length ÷ drop⌋; rolls = ⌈strips ÷ strips-per-roll⌉
- ✓Reference cited on-page: Wallcovering industry estimating practice (WA/UK)
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Wallpaper Roll Calculator use?+
It computes drop = height + repeat; strips/roll = ⌊roll length ÷ drop⌋; rolls = ⌈strips ÷ strips-per-roll⌉, per Wallcovering industry estimating practice (WA/UK). The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
A 64 cm repeat can waste a third of every roll — that's why the same room needs 6 plain rolls but 9 patterned ones. Always buy every roll from one batch number; dye lots differ visibly.
Does it include wastage?+
Yes — standard wastage/bulking factors are built in and stated in the formula line, so the quantity is an orderable number, not a bare geometric volume.
Is the Wallpaper Roll Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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