Wallpaper Calculator: The Complete Guide
Estimate how many rolls of wallpaper to buy. Enter the total length of your walls and their height to get the number of standard rolls needed, with a margin for pattern matching.
Who the Wallpaper Calculator is for
Decorators planning a wallpapering job who need a roll count before buying.
How to use the Wallpaper Calculator
- Type your values into the fields above — pick your currency or units where the calculator offers them.
- Results update automatically as you type; there's no submit button and nothing is sent to a server.
- Adjust any input to compare scenarios, then copy the result with a single click.
How it works
Wall area = total wall length × height. Rolls = area × 1.15 (for trim and pattern waste) ÷ the usable area of a standard roll (about 5 m²).
Features
- Standard rolls needed
- 15% waste included
- Imperial or metric
- Wall area shown
Buying wallpaper rolls
A standard wallpaper roll covers about 5 square metres once you account for trimming and matching the pattern. Calculate your total wall area, add roughly 15% for waste, and divide by the roll's usable coverage. Large pattern repeats waste more, so buy an extra roll and keep it for repairs.