Wallpaper Calculator by Room Perimeter
wallpaper calculator. Get instant, accurate results. Enter values for instant results with step-by-step formulas.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Rolls = (Perimeter × Height - Openings) / (Roll Width × Roll Length) × (1 + waste%/100)
Calculate wallpaper rolls needed including waste for pattern matching.
Worked Examples
Example 1: 14×14 ft bedroom, standard ceiling
Problem:56 ft total wall perimeter, 8 ft ceiling height, 40 sq ft of doors/windows, 27\" × 27 ft rolls
Solution:Wall area = 56 × 8 - 40 = 448 - 40 = 408 sq ft\nRoll coverage = (27/12) × 27 = 2.25 × 27 = 60.75 sq ft\nRolls = ceil(408 / 60.75 × 1.15) = ceil(7.73) = 8 rolls
Result:8 rolls needed
Example 2: Larger living room, 9 ft ceilings
Problem:70 ft perimeter, 9 ft ceiling height, 65 sq ft of doors/windows, same 27\" × 27 ft rolls
Solution:Wall area = 70 × 9 - 65 = 630 - 65 = 565 sq ft\nRoll coverage = 2.25 × 27 = 60.75 sq ft\nRolls = ceil(565 / 60.75 × 1.15) = ceil(10.69) = 11 rolls
Result:11 rolls needed
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy