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Wallpaper Calculator

Estimate wallpaper rolls, wall area, and adjusted coverage using roll size, waste, and pattern repeat allowance.

Wallpaper Calculator
✓ Your estimate
Estimated wallpaper needed
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rolls
Switch display unit only.
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Net sq ft
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Sq ft incl. waste
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Sq ft per roll
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Rolls
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Calculate first to see unit conversions.

What this estimate includes

This estimate shows wallpaper rolls based on wall area, openings, roll size, and a waste or pattern allowance.

How it’s calculated

Net area = wall width × height − openings
Adjusted area = net area × waste %
Roll coverage = roll width × roll length
Rolls = adjusted area ÷ roll coverage, rounded up

Before you order

Wallpaper patterns, repeats, trimming, and dye lots can change the roll count. Order matching lots and confirm coverage from the product label.

Frequently Asked Questions

Should I subtract windows and doors?
Yes, subtract large openings for a closer estimate.
How much waste should I use for wallpaper?
A simple pattern may use about 10%; larger pattern repeats may need 15-25% or more.
Does this handle pattern repeat exactly?
No. It uses a percentage allowance for planning.
Disclaimer: This calculator provides estimates only. Actual quantities depend on product coverage, jobsite conditions, waste, and supplier details. Verify all quantities before ordering. See all interior material calculators.