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Wallpaper Quantity Calculator

Estimate wallpaper rolls needed

Wall Width (feet)

Wall Height (feet)

Number of Walls

Roll Coverage (sq ft)

Pattern Repeat (inches)

Deduction (sq ft)

Wallpaper Calculation Formula

Total Wall Area = Width × Height × Number of Walls

Wallpaper Needed = (Total - Deductions) × Waste Factor

Rolls = Wallpaper Needed / Roll Coverage

Get the right amount of wallpaper for your project.

⚠ Pattern repeats larger than 6 inches need extra wallpaper. Always round up and buy extra for repairs.

Standard Roll Sizes

US Standard

21" × 16.5' = 28 sq ft coverage

European

20.5" × 33' = 30 sq ft coverage

Double Roll

Twice the length of single roll

Metric

0.53m × 10.05m = 5.3 sq m coverage

Teaching Example: Room 12×9 ft walls, 4 walls. Total = 432 sq ft. Minus 20 sq ft windows = 412 sq ft. With 15% waste = 474 sq ft. At 28 sq ft/roll = 16.9 rolls.

Applications

Interior Design Home Renovation Office Decor DIY Projects Real Estate

Frequently Asked Questions

How many square feet does a roll cover?▼

Standard US roll: 28 sq ft (21" × 16.5 ft). European roll: 30 sq ft. Actual usable coverage is less due to pattern matching.

What is pattern repeat?▼

Pattern repeat is the vertical distance before the design repeats. Larger repeats = more waste when matching patterns.

How to account for waste?▼

Add 10-15% for normal waste. Add 25% for large pattern repeats. Always round up.

Should I buy extra wallpaper?▼

Yes, buy 1-2 extra rolls for future repairs. Print batches vary slightly in color. Store leftover rolls flat.

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