Estimate how many rolls of wallpaper you need from your wall size and roll dimensions.
Understanding the wallpaper calculation
Enter the total wall width and height and your roll’s dimensions, and this calculator estimates the number of rolls needed, including about 15% extra for pattern matching and trimming.
Standard rolls vary, so use your roll’s actual size.
Getting your answer
- Enter the total wall width and height.
- Enter your roll length and width.
- Read the number of rolls.
The calculation
wall area = width × height
rolls = wall area ÷ (roll length × roll width) × 1.15
A worked example
On the values this calculator opens with, the rolls needed is 8. Underneath, Wall area comes out at 360 ft² and Coverage / roll at 57.8 ft². Change any field and every figure updates as you type.
Frequently asked questions
How many rolls of wallpaper do I need?
Divide the wall area by one roll’s coverage and add extra for pattern repeats and trimming, which the tool does automatically.
Why add extra?
Patterned wallpaper wastes some length matching the repeat, and you want spare for mistakes and repairs.
Do roll sizes vary?
Yes — enter your actual roll length and width for an accurate estimate.