Wallpaper Calculator
Calculate exactly how many rolls of wallpaper you need based on your room dimensions and pattern repeat. Our wallpaper estimator helps you avoid buying too much or too little.
Enter Your Measurements
Your Results
How it Works
This wallpaper calculator helps you determine how many rolls of wallpaper you'll need for your project. The calculator takes into account your room dimensions, wallpaper specifications, and any openings like doors and windows.
How It Calculates
- Calculates the total wall area (perimeter × height)
- Subtracts the area of doors and windows
- Determines the usable area per wallpaper roll
- Divides the total wall area by the usable area per roll
- Adds extra for pattern matching and waste
About Pattern Matching
Pattern matching significantly affects how many rolls you'll need:
- No pattern: Minimal waste as strips can be cut to maximize usage
- Small pattern (6" repeat): Moderate waste to match patterns
- Large pattern (12"+ repeat): Significant waste to ensure patterns align
The Formula Explained
Our wallpaper calculator uses industry-standard formulas to provide accurate estimates for your wall paper calculation needs.
Step 1: Calculate Total Wall Area
Room Perimeter = 2 × (Room Length + Room Width)
Step 2: Subtract Openings
Door Area = Number of Doors × 21 sq ft (standard door)
Window Area = Number of Windows × 15 sq ft (standard window)
Step 3: Calculate Usable Roll Area
Usable Roll Area = Roll Width in Feet × Roll Length
Step 4: Factor in Pattern Repeat
- No Pattern: 0% waste
- Small Pattern (6" repeat): 15% waste
- Large Pattern (12"+ repeat): 25% waste
Adjusted Usable Area = Usable Roll Area × (1 - Pattern Waste Factor)
Step 5: Calculate Number of Rolls
(Rounded up to the nearest whole number)
Note: It's always recommended to purchase an extra roll for mistakes or future repairs.
Why Choose Our Wallpaper Calculator
Precision Calculation
Our wallpaper estimator uses advanced algorithms that account for pattern repeats, openings, and industry standards to give you the most accurate estimate possible.
Cost Efficiency
Avoid expensive mistakes by knowing exactly how much wallpaper you need. No more wasting money on excess rolls or making emergency runs to the store.
User-Friendly
Designed with simplicity in mind, our calculator is easy to use for both DIY enthusiasts and professional decorators working on how to measure for wallpaper.
Benefits of Using Our Wallpaper Estimator
Save Time & Money
Get accurate estimates in seconds, avoiding unnecessary purchases or shortages.
Pattern Repeat Support
Our wallpaper calculator with repeat functionality accounts for pattern matching to ensure your walls look perfect.
Project Planning
Know exactly what you need before you shop, making project planning and budgeting easier.
Reduce Waste
Environmental benefits from buying only the wallpaper you actually need for your project.
Professional Results
Achieve the same precision in planning that professionals use for high-end wallpaper installations.
Confidence in Purchasing
Shop with confidence knowing exactly how much wall paper you need for your project.
Tips for Accurate Estimation
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Measure from floor to ceiling for accurate height, don't estimate.
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When measuring the perimeter, exclude openings wider than 60 inches.
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Standard doors are approximately 21 square feet (7' × 3').
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Standard windows average 15 square feet (5' × 3').
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Always round up to the nearest whole roll.
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Purchase an extra roll for future repairs or mistakes.
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Check the pattern repeat information on your wallpaper packaging for exact measurements.
James Davis
Master Contractor & Home Improvement Specialist
"This wallpaper calculator uses formulas and methods consistent with current industry practices and building codes. All calculations have been verified for accuracy to ensure you get reliable results for your project."
Frequently Asked Questions
How do I measure for wallpaper?
Measure the height and width of each wall. Multiply the width by the height to get the square footage. Add all walls together for total square footage. Don't forget to subtract for windows and doors.
What is a wallpaper pattern repeat?
A pattern repeat is the vertical distance between where the pattern matches itself again. Larger pattern repeats require more wallpaper because more material is wasted ensuring patterns match between strips.
How much extra wallpaper should I buy?
It's generally recommended to buy at least one extra roll beyond what the calculator suggests. This provides material for mistakes, future repairs, or tricky areas.
Why does the wallpaper calculator show more rolls than I expected?
The calculator accounts for pattern matching, waste during installation, and the fact that wallpaper comes in fixed roll sizes. It's always better to have slightly too much than not enough.
Can I use this calculator for peel and stick wallpaper?
Yes, the calculator works for all types of wallpaper as long as you enter the correct roll dimensions. Peel and stick wallpaper typically comes in different roll sizes than traditional wallpaper.