Wallpaper Calculator
Estimate wallpaper rolls for any room, pattern repeat aware.
ft
ft
ft
in
Rolls needed
7
Standard 20.5 in × 33 ft
Strips required
26
4/roll
Perimeter
44 ft
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How the wallpaper calculator works
A standard American double roll covers about 56 ft² but only ~35 usable ft² after trimming and pattern-matching. This calculator uses the strip method: compute the perimeter, divide by roll width to get strips needed, then divide by strips-per-roll based on your wall height plus pattern repeat.
Frequently asked questions
How many rolls of wallpaper do I need?
For a 12×10 ft room with 8 ft ceilings and no pattern repeat, plan on 5–6 single rolls (3 double rolls). Add one more for a large repeat.
What is pattern repeat?
The vertical distance before the pattern restarts. A larger repeat means more waste per strip, so you need more rolls.
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