Wallpaper Calculator
Find how many rolls of wallpaper to order. A 12 x 10 ft room with 8 ft walls needs 7 rolls with pattern waste.
How to calculate wallpaper rolls
Find the total wall area (perimeter x height), subtract doors (21 sq ft) and windows (15 sq ft), add waste for pattern matching, and divide by the usable coverage of one roll.
This example room has 301 sq ft of wall to cover. With 15% waste and 56 sq ft per roll you need 7 rolls, costing about $280.00.
Roll size and pattern repeat
A US double roll is about 27 inches wide and 27 feet long, which gives about 56 sq ft usable. Large pattern repeats and drop matches waste more paper, so use 20% or more. Always buy rolls from the same batch number so colors match. Planning flooring too? See the flooring calculator.
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Frequently asked questions
How many rolls of wallpaper do I need for a room?
Divide net wall area plus waste by the coverage of a roll, about 56 sq ft for a double roll.
How much extra wallpaper should I buy?
15% for small patterns and up to 25% for large repeats.
Do I subtract windows and doors?
Yes, but only large openings. Small ones are often ignored to leave extra for mistakes.
Is a single roll or double roll sold?
Both exist. Check the coverage on the label, and enter it in the calculator.
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