The Wallpaper Calculator helps you quickly determine how many rolls of wallpaper you need for your room. Simply enter your wall dimensions and wallpaper measurements to get an accurate estimate, saving time, money, and avoiding waste. Perfect for home improvement projects and interior design planning.
Ultimate Wallpaper Calculator Pro
Advanced Room Planning & Cost Optimization Tool
Quick Room Templates
Room Measurements
Additional Walls (Optional)
Doors & Windows
Doors
Windows
Wallpaper Material & Specifications
Installation Options
Waste Optimization
3D Room Preview
Quick Measurement Tool
Pattern Preview
Calculation Results
Surface Area Breakdown
Wallpaper Requirements
Cost Breakdown
Installation Info
Cost Distribution
Area Analysis
Shopping List & Recommendations
Materials Needed
Pro Tips
Advanced Analytics
Wallpaper Calculation Theory & Guide
Basic Calculation Formula
Total Wall Area = (Length + Width) × 2 × Height
Net Area = Total Area – (Doors + Windows)
Rolls Needed = Net Area ÷ Roll Coverage × (1 + Waste%)
Pattern Repeat Calculations
Straight Match: Pattern aligns horizontally across strips
Drop Match: Pattern alternates, requiring more wallpaper
Random Match: No pattern alignment needed
Adjusted Height = ⌈(Wall Height ÷ Pattern Repeat)⌉ × Pattern Repeat
Waste Factors
Standard rooms: 10% waste factor
Complex shapes: 15-20% waste factor
Large patterns: Additional 5-10% waste
DIY installation: Additional 10% waste
Standard Roll Sizes
US Single Roll:
21″ × 16.5′ (28 sq ft)
US Double Roll:
21″ × 33′ (56 sq ft)
European Roll:
52cm × 10m (56 sq ft)
Wide Width:
27″ × 27′ (60 sq ft)
Material Types & Costs
Vinyl: $30-80/roll – Durable, washable
Paper: $15-50/roll – Budget-friendly
Non-woven: $40-100/roll – Easy installation
Grasscloth: $60-200/roll – Premium texture
Fabric: $50-150/roll – Luxury option
Installation Tips
Preparation: Clean, smooth walls essential
Tools needed: Level, knife, smoothing brush
Start point: Begin from room’s focal point
Seams: Overlap and trim for invisible joints
Drying: Allow 24-48 hours before furniture
Professional vs DIY Cost Comparison
| Aspect | DIY Installation | Professional Installation |
|---|---|---|
| Labor Cost | $0 (your time) | $2-5 per sq ft |
| Tools & Supplies | $50-100 initial investment | Included in labor |
| Waste Factor | 15-25% (inexperience) | 10-15% (expertise) |
| Time Investment | 2-4x longer | Efficient completion |
| Warranty | None | 1-2 years typical |
Wallpaper Calculator FAQ
What is the Wallpaper Calculator?
The Wallpaper Calculator is an online tool that estimates the number of wallpaper rolls required for a specific room or wall area.
Does the calculator consider windows and doors?
You can subtract the area of windows and doors for a more accurate calculation.
Does it work for multiple walls or rooms?
Yes. You can add measurements for multiple walls or rooms to get a total wallpaper requirement.