Wallpaper Calculator

The pattern repeat is where the money goes

A plain paper gives four 2.5 m drops from a 10 m roll. Add a 64 cm repeat and each drop must be cut to a matching point, so you get three — a 25% increase in rolls for the same wall. Straight-match papers waste less than offset (drop-match) ones, and a large repeat on a low ceiling is the worst combination of all.

What this page needs from you

This page asks for room perimeter in m, wall height in m, roll width in m, roll length in m and pattern repeat in m. Further fields refine the estimate. From those it returns rolls needed. Every figure updates as you type, and nothing you enter leaves your browser.

Running short costs more than over-ordering

A second delivery carries its own charge, materials from a different batch may not match, and a job halted halfway often has to be redone at the join. Ordering slightly long is cheap insurance against all three.

Measure twice, and allow for waste

A 5% error on one dimension becomes 10% on an area and 15% on a volume, which is why checking the tape matters more than the arithmetic. On top of the measured quantity, allow the trade standard of 10% for cuts and breakage, and 15 to 20% for diagonal layouts, complex shapes or anything cut around obstacles.