Wallpaper Calculator
Determine how many rolls of wallpaper you need for any room. Calculate single and double rolls with pattern matching allowance.
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Wallpaper Guide
One standard single roll of wallpaper covers approximately 28 square feet. Most wallpaper is sold in double rolls (56 sq ft).
- Subtract 21 sq ft per standard door, 12 sq ft per window
- Order extra for pattern matching (especially large repeats)
- Consider ordering an extra roll for future repairs
Frequently Asked Questions
How many rolls of wallpaper do I need for a room?
Measure the perimeter of the room and multiply by the wall height. Subtract doors (21 sq ft each) and windows (12 sq ft each). Divide by 28 (sq ft per single roll). A 12x10 room with 8-ft ceilings needs about 5 single rolls.
What is the difference between single and double rolls of wallpaper?
A single roll covers approximately 28 square feet, while a double roll covers 56 square feet. Most wallpaper is sold in double rolls, which reduces waste and is more economical.
How do I match wallpaper patterns?
Check the pattern repeat measurement on the wallpaper label. Larger pattern repeats require more wallpaper for matching. Order extra rolls for patterns with repeats over 12 inches.
Can I wallpaper over existing wallpaper?
It's not recommended to wallpaper over existing wallpaper. The old wallpaper may peel off under the weight of the new paper, and seams may show through. Remove old wallpaper first.