Wallpaper Calculator
Calculate how many rolls of wallpaper you need for your room with pattern repeat waste, door and window deductions, and cost estimates.
Room Dimensions
Wallpaper Roll Size
Select a common roll size or enter custom dimensions
Pattern Repeat
Larger pattern repeats require more wallpaper for matching
Check wallpaper label for pattern repeat distance
Openings to Subtract
Doors
Default: 21 sq ft each
Windows
Default: 15 sq ft each
Price Estimate (Optional)
$
Wallpaper Calculation Results
Rolls to Buy
0
rolls
Rounded up from 0.00 rolls
Total Wall Area
0
sq ft
Openings
0
sq ft
Usable Wall Area
0
sq ft
Coverage/Roll
0
sq ft
Calculation Breakdown
Room Perimeter
0 ft
Gross Roll Coverage
0 sq ft
Pattern Waste
0%
Additional Waste Factor
10%
Exact Rolls Needed
0.00
Wallpaper Reference Guide
Common Roll Sizes
| Type | Dimensions | Coverage |
|---|---|---|
| US Single | 20.5" x 33ft | ~56 sq ft |
| US Double | 20.5" x 56ft | ~96 sq ft |
| Wide Roll | 27" x 27ft | ~60 sq ft |
| European | 21" x 33ft | ~57 sq ft |
Pattern Repeat Tips
- Random match patterns have no waste
- Straight match: align same point across strips
- Drop match: offset pattern by half repeat
- Larger repeats (18"+) can add 15-20% waste
- Always check manufacturer specifications
Installation Tips
- Always order 1-2 extra rolls for repairs
- Check all rolls are from same dye lot
- Start hanging from least visible corner
- Use plumb line to ensure vertical strips
- Allow paste to soak per manufacturer instructions