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PaintingWallpaper Calculator — How Many Rolls Do I Need?
Add up the walls you’re papering and enter the height to estimate single rolls, with trimming waste already built in.
How this calculator works
We figure wall area (length × height) and divide by about 25 usable square feet per single roll — typical after trimming and matching. Big pattern repeats use more.
What changes how much you need
- A "single roll" yields ~25 usable sq ft even though it’s sold bundled as double or triple rolls — buy by total area.
- Large pattern repeats waste more; add a roll for bold patterns.
- Buy all rolls from the same batch (dye lot) so colors match.
- Don’t subtract small windows and doors — the offcuts rarely reuse cleanly.
Frequently asked questions
How many square feet does a roll of wallpaper cover?
A single roll yields about 25 usable sq ft after trimming and matching, though it’s often sold bundled as double rolls.
Should I buy extra for pattern repeats?
Yes — the bigger the repeat, the more you waste matching it. Add a roll for bold or large-repeat patterns.
Do I subtract doors and windows?
For a safe estimate, no. Offcuts above and below openings seldom line up to reuse.