Wallpaper Calculator
Estimate how many wallpaper rolls you need based on wall dimensions, roll size, pattern repeat, openings, and waste allowance.
Enter Wall Details
Wall dimensions
Openings
Wallpaper roll
Your wallpaper estimate will appear here
Enter the wall and roll measurements, then select Calculate Rolls.
How Many Rolls of Wallpaper Do I Need?
Wallpaper is usually estimated by the number of full vertical drops required across a wall rather than by area alone. Roll width determines how many drops are needed, while roll length and wall height determine how many usable drops can be cut from each roll.
Pattern repeat can increase material usage because each drop may need extra length so the design aligns correctly from one strip to the next.
Number of Drops
Wall Width ÷ Roll Width
Adjusted Drop Length
Wall Height + Pattern Allowance
Drops per Roll
Roll Length ÷ Drop Length
Rolls Required
Drops Needed ÷ Drops per Roll
Why Pattern Repeat Matters
Wallpaper with a repeating design often requires each strip to be longer than the wall height so the pattern can align with the neighboring strip. Larger repeats may therefore reduce the number of usable drops that can be cut from each roll.
If your wallpaper has a stated pattern repeat, use the value printed on the product label rather than guessing.
Why Wallpaper Is Usually Rounded Up to Full Rolls
Wallpaper is normally sold in complete rolls, so the calculated number should be rounded up. Extra material can also be useful for matching patterns, replacing damaged strips, and making future repairs.
Products may be sold as single rolls, double rolls, bolts, or other package formats. Always compare the calculator’s roll dimensions with the actual product packaging.
Wallpaper Calculator Questions
Should I subtract doors and windows?
Large openings can reduce the amount of wallpaper needed, but installers may still need full-length strips around openings. This calculator uses average deductions for planning purposes, so complex walls may require a more detailed layout estimate.
What is wallpaper pattern repeat?
Pattern repeat is the vertical distance before a design repeats. It affects how strips must be aligned and may increase material usage.
Can I use this for peel-and-stick wallpaper?
Yes, provided the product is supplied in rolls and you enter its actual width and length. Panel-based wall coverings may require a different calculation method.
What if my walls have different heights?
Calculate walls with different heights separately, because the usable number of drops per roll may change.
Is the estimate exact?
No. Wallpaper use can vary with wall shape, pattern matching, installation method, openings, trimming, damaged material, and manufacturer specifications.