Wallpaper Calculator

Room perimeter Meter(m)

Room height Meter(m)

Opening width total Meter(m)

Roll width Meter(m)

Roll length Meter(m)

Pattern repeat Centimeter(cm)

Spare rolls

Price per roll optional

Strips needed: -

Strips per roll: -

Rolls needed: -

Wall area (ref): -

Material cost: -

Notes: -

Estimate strips, rolls and cost with the drop/strip method (better for pattern repeats than simple area).

Effective perimeter = perimeter − openings
Drop length = height + repeat; strips/roll = floor(roll length ÷ drop)
Strips needed = ceil(perimeter ÷ width); rolls = ceil(strips ÷ strips/roll) + spare

Plain: repeat ≈0; small pattern ~10 cm; large ~40 cm. Keep one spare roll from the same lot. Runs locally in your browser.