Enter the wall perimeter, the roll length and width, the pattern repeat and the number of doors and windows. The tool returns the number of strips, the rolls needed after waste and a recommended order quantity.
Calculator
Formula used
Strips = perimeter ÷ strip width · Strips per roll = roll length ÷ (wall height + repeat)
How to use the Wallpaper Quantity Calculator
- Measure the room perimeter (length × 2 + width × 2).
- Check the roll label for length, width and pattern repeat.
- Subtract the number of doors and windows from the strip count.
- Order one extra roll for repairs.
About this tool
The Wallpaper Quantity Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Estimating a feature-wall project.
- Comparing two roll sizes on the same wall.
- Planning a full-room wallpaper with a large pattern.
- Working out waste before ordering a sample.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Does pattern repeat really matter?
Yes. A 24-inch repeat can add 15-20% waste; a 36-inch repeat can add 30%. Always include it in the calculation.
Should I order extra?
Yes, one extra roll is the standard insurance against mis-cuts and future repairs.
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