Material Calculators

Wallpaper Calculator

Calculate wallpaper rolls needed for any room, including pattern repeat.

Room Length (ft)

Room Width (ft)

Ceiling Height (ft)

Doors

Windows

Roll Width (inches)

Roll Length (ft)

Pattern Repeat (inches, 0 if none)

How to calculate wallpaper rolls for a room

Measure each wall's width and height, and enter the room's total perimeter or individual walls.
Enter the roll dimensions from the product label — width in inches and length in feet per roll.
Set the pattern repeat distance if the wallpaper has a repeating design. More repeat means more waste.
The calculator shows usable drops per roll, total drops needed, and rounds up to full rolls — always buy that rounded-up count.

Common uses

Hanging wallpaper in a bedroom, dining room, or entryway
Covering an accent wall with patterned wallpaper
Estimating peel-and-stick wallpaper for a rental-friendly update

Frequently asked questions

How many rolls of wallpaper do I need for a 12×12 room?

A 12×12 room with 8-foot ceilings and one door takes about 8–10 single rolls, depending on the roll size and pattern repeat. Using the calculator with your specific roll dimensions gives a more accurate count.

What is pattern repeat and how does it affect the quantity?

Pattern repeat is the vertical distance before the design repeats. With a 24-inch repeat, you may waste up to 23 inches per strip to align the pattern. More repeat always means more rolls.

Should I buy extra rolls?

Buy at least one extra roll from the same batch number (dye lot). Rolls from different batches may have visible color differences that appear after hanging.

Not sure whether to DIY this project?

Read our project-by-project guide on when to hire a contractor vs. do it yourself.

Read the guide →

About this calculator

Enter your room dimensions and roll specs to get exact roll count. Accounts for doors, windows, pattern repeat waste, and rounding up to full rolls.

All results are estimates. Verify quantities with your local supplier and confirm measurements before purchasing materials. Requirements vary by region and project type.

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