Wallpaper Calculator

Calculate wall perimeter (2 × length + 2 × width), multiply by wall height for total wall area. Subtract door (21 sq ft each) and window (15 sq ft each) areas. Divide by usable coverage per roll. Add 10-20% for pattern matching waste. This calculator handles all steps automatically and accounts for pattern repeat which significantly affects material needs.

Pattern repeat is the vertical distance before the design repeats. To match patterns between strips, you must waste paper—more waste for larger repeats. A 24" repeat can waste 20% or more per strip. Drop-match patterns (offset by half) waste even more. Solid colors and random textures have zero repeat waste. Always check repeat specification before purchasing.

US wallpaper is priced per single roll but sold in double rolls. A single roll is approximately 33-36 sq ft (20.5"×33 ft); a double roll is 56-72 sq ft (20.5"×56 ft). European rolls are typically 10m×53cm (about 57 sq ft). Always clarify with retailer what you're purchasing—price "per roll" may mean single or double depending on supplier.

Wallpaper prices vary: USA $20-200+ per double roll; UK £15-150 per 10m roll; EU €20-180; Australia A$40-300. Budget vinyl starts around $20; mid-range $40-80; designer and specialty $100-300+. Installation: $30-60/roll or $3-8/sq ft. DIY saves labor but requires skill. Always buy from same dye lot—colors vary between batches.

Yes, always order 10-15% extra beyond calculated needs. Pattern matching creates waste, mistakes happen, and you need reserves for future repairs. Wallpaper patterns get discontinued—if you need more later, it may be unavailable or different dye lot. Store extras in dry place. Most retailers allow returns of unopened rolls within a time period.

Walls must be clean, smooth, and primed. Remove old wallpaper, fill holes and cracks, sand smooth. Apply wallpaper primer/sizing—essential for proper adhesion and easier future removal. New drywall needs primer. Glossy paint needs sanding. Take time with prep—imperfections show through wallpaper. Professional prep ensures better results and easier installation.