Wallpaper Calculator — Free Online Wallpaper Calculator
Calculate how many rolls of wallpaper your walls need. 100% free, no signup.
Rolls needed
0
Wall area0 ft²
With pattern waste0 ft²
Roll coverage0 ft²
How many rolls of wallpaper do I need?
Multiply the total wall width by the height to get the area, add 10–15% for pattern matching (more for large repeats), then divide by the usable coverage of one roll. A standard US double roll covers about 56 ft²; European rolls vary, so check the label.
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Frequently asked questions
How much extra for pattern matching?
Add about 10% for a small/random pattern and 15–20% for a large repeat, since more is trimmed to line up the design.
Do I subtract doors and windows?
For a rough estimate you can ignore them as a safety margin; for large openings, subtract their area from the wall area first.
Want to preview the wallpaper?
Download RoomGPT free and see new wallpaper and full redesigns on a photo of your real room.