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/// Wall area and roll coverage

Wallpaper Calculator

Use the wallpaper calculator to total room-wall area, subtract entered openings, apply the pattern allowance you choose, divide by usable coverage per roll, and round up. Usable coverage must reflect the selected product and layout. Pattern repeat, drop matching, roll format, wall condition, corners, and retained spare material need separate verification.

Content reviewed Jul 16, 2026 · Source records reviewed through Jul 15, 2026

01

Room walls and usable roll coverage

Use usable rather than nominal roll coverage when the pattern repeat or trimming reduces the number of full-height drops.

ftExample starting measurement — replace it with your field measurement.
ftExample starting measurement — replace it with your field measurement.
ftExample starting measurement — replace it with your field measurement.
ft²Example starting measurement — replace it with your field measurement.
ft²Required — enter the value from the exact product label or current technical sheet. ProjectQty does not guess this value.Roll Coverage must be greater than zero.
%Required — enter a project-specific planning value and verify it before ordering. ProjectQty does not apply an unsupported default.
USDOptional — enter your current local price per roll.
View current estimate

/// Answer-first planning notes

How many wallpaper rolls cover my net wall area?

How many wallpaper rolls cover my net wall area checkpoints
Planning inputCalculation roleProduct check
Wall perimeter and heightCreate gross wall areaMeasure each room section
OpeningsReduce net papered areaDeduct only surfaces not covered
Usable roll coverageConvert area into whole rollsAccount for product format and repeat

/// Formula & field notes

How this wallpaper estimate works

FormulaWallpaper rolls = net wall area × (1 + pattern waste %) ÷ usable coverage per roll, rounded up.

Worked example

A 12 × 10 × 8 ft room has 352 ft² of wall; after 20 ft² of openings and 10% waste, 56 ft² rolls produce a 7-roll order.

/// Source trail

Data & assumptions

Every source has a declared scope. A reference can support a conversion or product assumption without turning this estimate into a supplier quote.

National Institute of Standards and Technology · Primary evidenceNIST Guide to the SI, Appendix B: Conversion Factors

Exact international-foot to meter conversion; U.S. survey-foot conversion is explicitly outside this claim.

Effective 2025-08-18 · Reviewed 2026-07-15 · Next review 2027-07-15
NOAA National Geodetic Survey · Prequalified fallbackThe DSDATA Format, Appendix D: U.S. Survey Foot vs International Foot

Independent confirmation that one international foot equals exactly 0.3048 meters; U.S. survey-foot conversion remains distinct.

Effective 2025-06-10 · Reviewed 2026-07-15 · Next review 2027-07-15

/// Common questions

Wallpaper calculator FAQ

What should I verify before ordering wallpaper?

Confirm field dimensions and usable roll coverage and pattern repeat against the exact product or supplier information. ProjectQty shows the assumptions so you can replace planning defaults before ordering whole rolls.

How does waste affect the wallpaper estimate?

Waste is applied after the base geometry is calculated and before discrete packages or pieces are rounded up. Use a higher allowance for complex layouts, cuts, pattern matching, breakage, or uncertain field dimensions.

Is this wallpaper result a professional design?

No. It is a quantity-planning result. Wall preparation, adhesive, pattern matching, batch consistency, and wet-room suitability require product instructions.

/// Keep planning

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