Wallpaper Calculator — How Many Rolls Do I Need?

Calculate how many rolls of wallpaper you need for your room. Accounts for doors, windows, and pattern repeat to give you an accurate estimate.

Measure the longest wall of your room
feet
Measure the wall perpendicular to the longest wall
feet
Standard ceiling height is 8 feet
feet
Standard interior doors — we subtract 21 sq ft each (3'×7')
Standard windows — we subtract 15 sq ft each (3'×5')
Standard American single roll is about 33 ft (10m). Check your wallpaper specs.
feet
Standard American roll is 21 inches wide. European rolls are often 27 inches.
inches
Distance before the pattern repeats. Use 0 for solid colors or textures with no pattern.
inches
—
Rolls Needed
Total Wall Area —
Usable Area (after openings) —
Strips Needed —
Disclaimer This calculator provides estimates for planning purposes only. Actual material requirements may vary based on surface conditions, application method, product brand, and other factors. Always consult product labels and your supplier for precise quantities. We are not responsible for material shortages or excess resulting from the use of this tool.

Assumptions

  • Standard door opening = 21 sq ft (3'×7')
  • Standard window opening = 15 sq ft (3'×5')
  • Standard American single roll: 33 ft long × 21 inches wide (~56 sq ft)
  • European single roll: 33 ft long × 21 inches wide (similar to US)
  • Pattern repeat adds waste — each strip may need extra length to align the pattern
  • Rolls are rounded up — buy an extra roll for mistakes and future repairs
  • Does not account for ceiling papering — walls only
  • Openings are subtracted from area calculation but not from strip count (strips still span the wall)

Frequently Asked Questions

How many rolls of wallpaper do I need for a 12x10 room?

A 12×10 foot room with 8-foot ceilings typically needs 7 rolls of standard wallpaper (21" wide, 33 ft long). Patterned wallpaper with a repeat may require 1–2 extra rolls.

Should I order extra wallpaper?

Yes, always order at least 1 extra roll. Wallpaper dye lots can vary between production runs, so it's better to have extra from the same batch for repairs or mistakes.

How does pattern repeat affect how much wallpaper I need?

Pattern repeat means each strip needs extra length to align the design with the adjacent strip. A 12-inch repeat on 8-foot walls means each strip could waste up to 12 inches, requiring more rolls overall — typically 15–20% more than a solid pattern.

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