Wallpaper Calculator
Interior · Updated July 2026
Enter your room's perimeter, wall height, and roll coverage to find how many rolls of wallpaper you need — with pattern waste included.
Your project
Results
Estimates only. Add extra for waste and confirm with your supplier.
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How much wallpaper do I need?
Calculate wall area (perimeter × height), then divide by the usable coverage per roll. Plan to use only about 85% of each roll due to pattern matching.
How many rolls of wallpaper
Calculate wall area (perimeter × height) and divide by the usable coverage per roll. Plan to use only about 85% of each roll — pattern matching and trimming waste the rest — and buy from one batch number.
Patterns need extra
Large pattern repeats waste more paper because each strip must line up with the last. For a bold repeat, add an extra roll or two beyond the base estimate.
How to use this calculator
- 1Add up all wall lengths for the perimeter.
- 2Enter wall height and roll coverage.
- 3Read the number of rolls.
Frequently asked questions
How many square feet in a roll of wallpaper?
A standard American double roll covers about 56 sq ft, though usable coverage is lower with patterned paper.
How many square feet in a roll of wallpaper?
A standard American double roll covers about 56 sq ft, though usable coverage is lower with patterns.
How much extra wallpaper for pattern matching?
Expect to lose about 15% per roll, and more for large pattern repeats.
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