Wallpaper Calculator
Free wallpaper calculator. Enter wall width, height and pattern repeat to get the number of rolls and strips you need, accounting for doors and windows.
Based on standard 21" wide × 33' long double rolls, using the strip method so the pattern matches at every seam.
About This Free Online Wallpaper Calculator
Our free wallpaper calculator tells you exactly how many rolls of wallpaper to buy. It uses the proper strip method: it works out how many full-height strips your wall needs, how many strips you can cut from one roll (accounting for the pattern repeat so the design lines up), then divides to get the number of rolls. Enter the wall width and height in feet, the pattern repeat in inches, and any door and window area to subtract. The calculator assumes standard 21 inch wide × 33 foot long double rolls. Everything runs in your browser with no signup.
Features of Our Wallpaper Calculator
- Roll and strip counts using the accurate strip method
- Accounts for pattern repeat so the design matches
- Subtracts door and window area from the wall
- Built around standard 21" × 33' double rolls
- Adjustable for any wall width and height
- 100% client-side and private — no signup, no data sent
How to Use the Wallpaper Calculator
Using this tool is simple and requires no signup or registration. Follow these steps:
- Enter the total wall width and the wall height in feet.
- Enter the pattern repeat in inches (0 for a random-match paper).
- Subtract any door and window area from the wall.
- Read the number of rolls and strips to buy.
Frequently Asked Questions About Wallpaper Calculator
How many rolls of wallpaper do I need?
Divide the wall width by the roll width (21 inches) to get the number of full-height strips, then divide by how many strips you can cut from one roll (accounting for the pattern repeat). This calculator does both steps so the pattern matches at the seams.
What is a pattern repeat and why does it matter?
The pattern repeat is the vertical distance before the design repeats. A larger repeat means more waste aligning each strip, so you get fewer strips per roll and need more rolls. Enter the repeat from the roll label.
What size is a standard wallpaper roll?
This calculator uses a standard US double roll of 21 inches wide by 33 feet long. If your roll is a different size, scale the result accordingly or buy the nearest whole number of rolls above the estimate.
Should I round up when buying wallpaper?
Yes — always round up to whole rolls and buy from the same dye lot. Running short means the replacement lot may not match. This calculator already rounds up to whole rolls and strips.
Is this wallpaper calculator free?
Yes, completely free with no signup. Every estimate runs in your browser, so nothing is uploaded or tracked.
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