Wallpaper Calculator
Calculate how many rolls of wallpaper you need for your room. Account for doors, windows, and pattern matching waste.
Standard US: 21", Euro/commercial: 27", Wide: 36"
Enter your room dimensions to calculate wallpaper needed.
How It Works
Our wallpaper calculator measures your wall perimeter, multiplies by ceiling height, then deducts standard door and window areas. We factor in 15% waste for pattern matching and trimming, then divide by the usable coverage per roll.
Wallpaper is sold by the single or double roll. A standard single roll (21" Ă— 33') covers approximately 58 square feet gross, but pattern repeats reduce usable coverage. Larger patterns mean more waste.
Always order from the same dye lot (batch) to ensure consistent color. Keep extra rolls for future repairs—finding an exact match later is often impossible.
Frequently Asked Questions
How do I measure for wallpaper?
Measure the width of each wall at its longest point, add them together for the perimeter, then multiply by ceiling height. For accuracy, measure in inches and convert to feet. Include alcoves and bump-outs in your measurements.
What is a pattern repeat and why does it matter?
Pattern repeat is the distance between where the design repeats. Larger repeats (12"+) mean more waste as you cut extra to align patterns. Random textures and solid colors have no repeat and minimal waste.
What's the difference between single and double rolls?
Wallpaper is priced by the single roll but often sold in double-roll bolts (twice the length). This reduces waste on tall walls. Always confirm with your retailer whether pricing is per single or double roll.
Can I wallpaper over existing wallpaper?
Generally not recommended. Old wallpaper can bubble, peel, or show through. Best practice is to remove existing wallpaper, repair the wall, and apply primer before new wallpaper. This ensures proper adhesion and a smooth finish.
How difficult is wallpaper to install?
DIY-friendly for simple patterns and flat walls. Challenges increase with large patterns (matching), complex rooms (many corners/obstacles), and certain papers (grasscloth, vinyl). Peel-and-stick wallpaper is easiest for beginners.