How to Calculate Wallpaper Rolls Needed, Accounting for Pattern Repeats

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Running short on wallpaper can leave a project half-finished, so accurate estimation matters. The article explains a four-step method: calculating drops from wall and roll width, determining cut length by adding the pattern repeat to wall height, finding how many drops fit on one roll, and then totaling the rolls required. It provides a JavaScript function that automates these calculations, converting the pattern repeat from inches to feet. The author advises accounting for straight versus drop matches, buying an extra roll as a safety margin, and subtracting doors and windows from the total wall area. A free, client-side wallpaper roll estimator tool is also promoted by the author.

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