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Wallpaper Calculator

Estimate how many double rolls of wallpaper you need for a room.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
13.12 ft11.48 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Estimated wallpaper needed

8 double rolls

High confidence
Wall area
387.5 sq ft
Waste factor applied
15 %
Area with waste
445.63 sq ft

Running these inputs gives 8 double rolls as the result. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • US double rolls cover approximately 56 sq ft of usable wallpaper after trimming
  • 10% waste is standard; large pattern repeats or diagonal cuts can push waste to 20-25%

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Does this subtract doors and windows?
No — this deliberately doesn't subtract openings, since leftover partial rolls from door/window areas are rarely useful for other walls anyway. It's a conservative, safely-rounded-up estimate.
What counts as a large pattern repeat?
Anything over about 18 inches (46 cm) between pattern repeats, printed on the product label. Larger repeats waste more material aligning adjacent strips.
Should I buy all rolls from the same dye lot?
Yes — always buy enough in one order from the same dye lot / batch number, since color can vary slightly between production runs.