Wallpaper Roll Calculator
How many rolls of wallpaper you need, including pattern repeat. Results update as you type.
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Results
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About the Wallpaper Roll Calculator
Work out how many rolls of wallpaper a room needs, including the extra length lost to a pattern repeat. Choose all four walls or a single feature wall, and enter the roll width and length from the label.
You can use metric or imperial measurements and add a price to estimate cost.
Choose your currency (₹, $, €, £ and more) and every amount updates. The calculation runs in your browser, so the numbers you enter are not uploaded.
Wallpaper Roll Calculator example
Room length: 4.5
Room width: 3.5
Wall height: 2.6
Roll width: 53
Roll length: 10.05
Pattern repeat: 32
Price per roll: 1800Rolls needed: 11
Strips (drops) needed: 31
Strip length incl. trim and repeat: 2.88 m
Wall width covered: 16 m
Spare strips in the last roll: 2
Estimated cost: ₹19,800How it is calculated
Wallpaper is hung in vertical strips called drops. The number of drops is the wall width divided by the roll width, rounded up. Each drop is the wall height plus 10 cm for trimming, rounded up to the next pattern repeat. The strips that fit on one roll are the roll length divided by the drop length, rounded down. Rolls needed is drops divided by strips per roll, rounded up.
Strips (drops) = wall width ÷ roll width, rounded upStrip length = wall height + 10 cm trim, rounded up to the pattern repeatStrips per roll = roll length ÷ strip length, rounded downRolls = strips ÷ strips per roll, rounded up
What to enter
- Roll width. Blank = 53 cm (metric) or 21 in (imperial).
- Roll length. Blank = 10.05 m or 33 ft.
- Pattern repeat. 0 or blank for a plain or random pattern.
Assumptions and limits
Default roll: 53 cm wide and 10.05 m long (21 in × 33 ft). Rolls sold elsewhere can differ, so use the label.
How to use the Wallpaper Roll Calculator
- Fill in the fields above. Required fields are marked, optional ones can be left blank and fall back to the defaults described on this page.
- Use “Try an example” to see a worked case, then replace the numbers with your own.
- Read the results as you type. The large card is the main answer and the smaller cards are the related figures.
- Copy a single value or everything, or share a link that keeps your inputs.
Wallpaper Roll Calculator FAQ
How does the wallpaper roll calculator work?
Wallpaper is hung in vertical strips called drops. The number of drops is the wall width divided by the roll width, rounded up. Each drop is the wall height plus 10 cm for trimming, rounded up to the next pattern repeat. The strips that fit on one roll are the roll length divided by the drop length, rounded down. Rolls needed is drops divided by strips per roll, rounded up.
What is a pattern repeat?
It is the vertical distance before the design repeats. Large repeats waste more paper because neighbouring strips must line up, so check the repeat on the label.
Why are doors and windows not deducted?
You still need full strips above and below them, and a strip cannot be cut across the roll, so deducting area usually leaves you short.
Is this wallpaper roll calculator free and private?
Yes. It is free with no sign-up, and the calculation happens on your device, so your numbers are never sent to a server.
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