How to estimate wallpaper
Find wall area from room perimeter and height, subtract openings, add waste, and divide by usable roll coverage.
Before you buy
Use usable rather than nominal roll coverage. Pattern repeats, matching, and wall irregularities can increase requirements.
Why does pattern repeat matter?
Matching a repeating design often requires cutting off extra material from each strip.
Last reviewed: October 2026. This tool performs calculations locally in your browser.