Wallpaper Calculator
Work out how many rolls of wallpaper to buy before you order. Enter the total wall width and height, your roll size and the pattern repeat — the calculator divides the wall into strips, works out how many usable strips each roll yields, and rounds up to whole rolls.
Rolls needed
5 rolls
Strips to cut
20 strips
Wall area
272 sq ft
Usable wall width: 34 ft · each roll yields about 4 usable strips · Estimated cost: $200.00
How to use this wallpaper calculator
- Add up the total width of all the walls you are papering.
- Enter the wall height in feet.
- Enter your roll width and length — a US single roll is 20.5 in wide and 33 ft long.
- Enter the pattern repeat in inches — use 0 for a random match.
- Enter the number of door and window openings to deduct.
- Read the strips and rolls needed.
Frequently asked questions
How many square feet does a roll of wallpaper cover?
A standard US single roll is 20.5 inches wide and 33 feet long — about 56 sq ft — but the pattern repeat reduces usable length, so real coverage per roll is lower.
What is pattern repeat and why does it matter?
The repeat is the vertical distance before the pattern starts over. Matching it forces you to trim each strip, so a large repeat means fewer usable strips per roll and more rolls overall.
Should I deduct doors and windows?
Yes. This calculator deducts roughly 3 feet of wall width per opening, which covers a standard door or window.
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