Read the roll label
Roll width, roll length, pattern repeat and match type can all change the quantity. Use the details for the exact wallpaper you plan to buy.
Free decorating tool
Wallpaper Calculator
Estimate how many rolls you need from your wall sizes, the roll dimensions and the pattern repeat. Add each wall separately for a clearer, more useful result.
Before you order
Keep openings in the estimate
The calculator treats each wall as a full rectangle. That leaves a practical margin around doors and windows instead of assuming every offcut can be reused.
Buy one batch where possible
Check the batch or dye-lot number on every roll. Rolls from different batches can show a slight colour variation once they are on the wall.
Special patterns need a final check
A half-drop, offset match, mural or panel set may need a different layout. Treat this result as a planning figure and follow the product instructions.
Wallpaper calculator questions
How does the calculator work?
It finds the number of wallpaper widths, or drops, needed for each wall. It then adjusts each drop for trimming and a straight pattern repeat before fitting those drops into the selected roll length.
Should I subtract doors and windows?
Usually not for a planning estimate. Keeping them in gives you material for matching, cutting and small repairs. A very large opening may justify a separate calculation.
Does this calculate paste or labour?
No. It estimates wallpaper rolls only. Paste coverage and labour depend on the product, wall condition and installation method.