How do I account for pattern repeat?

Add 15–20% waste for large repeats so strips line up; small or random patterns need only 10%.

How much does one roll cover?

A standard double roll covers about 25 usable square feet after trimming and matching.

Do doors and windows reduce rolls?

Slightly, but keep the offcuts — they cover short sections above and below openings.

Wallpaper Calculator

How many rolls of wallpaper for the room?

Wallpaper rolls needed equals wall area plus pattern waste, divided by the usable coverage per roll (about 25 sq ft for a standard double roll after trim).

Wallpaper Calculator

Wall perimeter(ft)

Wall height(ft)

Pattern waste(%)

Your result

Rolls to buy

Wall area with waste404.8 sq ft

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How it's calculated

1Multiply wall perimeter by height for wall area.
2Add 10–20% for pattern repeat and matching.
3Divide by usable coverage per roll (~25 sq ft).
4Round up and buy from one batch number.

Key takeaways

Large pattern repeats waste more paper.
A double roll covers about 25 usable sq ft.
Buy all rolls from the same batch to match color.

Wallpaper Calculator FAQ

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