How many rolls of wallpaper do I need?
Divide total wall square footage (minus doors and windows) plus waste by the coverage per roll. A standard double roll covers about 57 sq ft.
Wallpaper Calculator
Wallpaper is sold by the roll, not the gallon. Enter room dimensions and roll size (default 21-inch × 33 ft double roll) to get a roll count with pattern repeat and waste built in.
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Roll settings
Standard double roll: 21"
Common: 33 ft
0 for no repeat
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Pattern repeat eats rolls
Solid and textured papers without a repeating motif waste the least. Geometric and floral patterns must align strip to strip — enter repeat height in inches and the calculator adds matching waste automatically.
Our wallpaper pattern repeat guide explains how to read repeat symbols on the bolt label.
Always keep one extra roll
Dye lots vary between production runs. If you patch a wall two years later with a roll from a different lot, the colour may not match. Buy one spare roll from the same batch and store it flat.
For a single feature wall, try the accent wall wallpaper calculator. For paint on the other walls, switch to the room paint calculator.
Related guides
Frequently asked questions
How does pattern repeat affect rolls?
Repeating patterns waste paper when strips must align. Enter your repeat in inches — the calculator adds extra waste automatically.
Should I buy an extra roll?
Yes. Keep one extra roll for future repairs and in case of color lot differences. The waste percentage helps cover matching cuts.
Related calculators
Paint Calculator · https://paint-calculator.ca/wallpaper-calculator/