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Wallpaper Calculator

Rolls needed, accounting for roll size and pattern-repeat wastage.

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Add up every wall you're papering — perimeter of the room, not one wall alone.
Patterned wallpaper needs extra length per strip so the pattern lines up between drops.
Rolls needed3 rolls
Strips needed10
Length per strip250 cm

This is an estimate based on standard trade formulas and typical product coverage rates — actual coverage varies by brand, surface condition, and application method. Always check the specific product's packaging and buy a small extra margin for cuts, breakage, and mistakes. Read the full disclaimer.

Frequently Asked Questions

What's the difference between European and US wallpaper roll sizes?

European "standard" rolls are typically 53cm wide and 10.05m long; US rolls are commonly wider (around 68.5cm) but shorter (about 8.2m). The two aren't interchangeable for calculating quantity — always check the actual roll you're buying, since sizes vary further by manufacturer.

Why does a pattern repeat increase how much wallpaper I need?

Patterned wallpaper has to line up between adjacent strips, so each strip needs extra length cut off at the pattern's repeat point to keep the design continuous — this extra is wasted material. A wallpaper with no repeat (a plain color or texture) wastes almost nothing per strip by comparison.

Should I buy extra rolls beyond the calculated number?

It's common practice to buy one extra roll beyond the calculation, especially for a large or oddly-shaped room, or when the wallpaper might be discontinued — matching dye lots later can be difficult or impossible.