Wallpaper calculator
Plan vertical wallpaper strips from your wall measurements and actual roll size. This conservative estimate supports free/random and straight matches, with a clear allowance for trimming and pattern alignment.
Your wallpaper estimate
ESTIMATEDA conservative cutting estimate for one product. Every strip uses the maximum wall height. Windows, doors and offcuts do not reduce the count. Paste, tools, labor, tax and delivery are excluded.
The example calculates when JavaScript is enabled.
How to use this calculator
- Measure each wall’s width and maximum height. Keep openings included and add any required corner-width allowance yourself.
- Enter the actual purchased roll dimensions, usable width and combined top-and-bottom trimming allowance.
- Choose free/random or straight match. For straight match, enter the vertical repeat from the label. Check unsupported designs with the supplier.
- Calculate and review strips per roll before buying. Add extra spare rolls if wanted. Unit changes convert measurements, never your currency or price.
A strip must fit on the roll.
Each wall needs its width divided by the usable roll width, rounded up separately. All strips use the tallest wall plus your total trim allowance. Free-match paper uses that cut length directly.
For straight match, the cut length rounds up to a whole pattern repeat. This tool also reserves one full repeat at the beginning of every roll, then counts only complete strips in the remaining length. That deliberately conservative reserve allows for roll-start pattern alignment; it may overestimate a cutting plan checked by an installer.
Try the worked example.
Limits worth checking before you buy.
Why not subtract windows and doors or use total wall area?
A short area above a window does not necessarily replace a full-height strip, and patterned offcuts may not match elsewhere. This calculator leaves openings included, rounds strips per wall and does not reuse partial widths. A supplier can refine the estimate from a detailed cutting layout.
Does this support half-drop, offset patterns or murals?
No. Those designs may require alternating drops, separate roll sequences, panel alignment or other product-specific planning. Do not select straight match as a substitute. Check the label and ask your supplier for a cutting plan. Order matching batches and verify the purchased roll dimensions.
Sources and assumptions
Graham & Brown’s wallpaper FAQ explains free, straight and offset matching, pattern repeats and batch numbers. The strip-count method and full-repeat startup reserve shown here are this calculator’s explicit conservative assumptions; the manufacturer’s own product instructions take priority.