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Calculators / Construction / Patterned wallpaper rolls
Patterned wallpaper rolls calculator
Estimate full wallpaper drops and rolls for a straight-match repeating pattern.
On this page
Pattern-adjusted drop length3.2m
Required full drops23
Full drops per roll3
Estimated rolls8
Calculator controls
How to calculate
Estimate full wallpaper drops and rolls for a straight-match repeating pattern.
Pattern-adjusted drop length =
ceil(h/r)*r mRequired full drops =
ceil(P/w)Full drops per roll =
floor(l/(ceil(h/r)*r))Estimated rolls =
ceil((ceil(P/w))/(floor(l/(ceil(h/r)*r))))Worked example
- Total wall width (m): 12
- Required drop including trim (m): 2.6
- Roll width (m): 0.53
- Roll length (m): 10.05
- Vertical pattern repeat (m): 0.64
- Pattern-adjusted drop length: 3.2 m
- Required full drops: 23
- Full drops per roll: 3
- Estimated rolls: 8
Assumptions and limits
A positive vertical repeat is required. Half-drop matches, opening deductions, corner trimming, unequal walls and batch allowances are excluded. Enter height with trimming already included.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate full wallpaper drops and rolls for a straight-match repeating pattern. Drop length rounds up to a whole repeat; leftover roll lengths are not joined to make a full drop.
When this tool is useful
Drop length rounds up to a whole repeat; leftover roll lengths are not joined to make a full drop.
Understanding your inputs
| Input | Example |
|---|---|
Total wall width (m) P | 12 |
Required drop including trim (m) h | 2.6 |
Roll width (m) w | 0.53 |
Roll length (m) l | 10.05 |
Vertical pattern repeat (m) r | 0.64 |
Frequently asked questions
What does this model leave out?
A positive vertical repeat is required. Half-drop matches, opening deductions, corner trimming, unequal walls and batch allowances are excluded. Enter height with trimming already included.
How do I reproduce the example?
Enter the displayed example values in their labelled units. Apply the formula before rounding; change one input at a time to compare scenarios.