Wallpaper Calculator
Calculate the number of wallpaper rolls needed for your room. Enter room dimensions and wallpaper specifications to get accurate estimates. Accounts for pattern repeats, openings, and recommended waste allowance.
Reviewed by the SparkCalc editorial team
How We Calculate This
Wall area = perimeter × height - openings. Strips per wall = width / wallpaper width (21"). Coverage = strips × usable length per strip. Adds 10% waste factor.
Sources: Wallcovering Installers Association — Wallcovering Estimator · Wallcovering Installers Association — Consumer Wallcovering Resources
Frequently Asked Questions
What is the difference between single and double rolls?
A single roll covers about 30 sq ft, a US double roll covers about 56 sq ft. Most US wallpaper is sold in double rolls. European rolls are typically 10 meters long and cover about 57 sq ft.
How does pattern repeat affect the amount needed?
Pattern repeat adds waste because each strip must align. Larger repeats (21"+) can add 15-25% waste. For no pattern or random match, waste is minimal.
How much extra should I order?
Order 10-15% extra for cutting waste, mistakes, and future repairs. This calculator includes 10% waste. For beginners or complex patterns, add more.
Should I paper behind furniture?
Yes, paper the whole room. You may rearrange furniture later. Stopping and starting creates visible seams and alignment issues.
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