Wallpaper Calculator
Determine how many rolls of wallpaper are needed for a room.
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Estimate How Many Rolls of Wallpaper You Need
Our Wallpaper Calculator helps you determine the precise number of rolls required for your project by factoring in room dimensions and roll size, preventing shortages and overspending.
What is a Wallpaper Calculator?
A Wallpaper Calculator is a handy tool for any interior design or home renovation project. It simplifies the process of determining how many rolls of wallpaper you need to buy to cover a room. By taking into account the room's perimeter, height, and the dimensions of the wallpaper roll, it provides an accurate estimate that helps you purchase the right amount of material, avoiding waste and ensuring you have enough to complete your project seamlessly.
How It Works: The Calculation Formula
The calculator uses a strip-based method for accuracy:
1. Room Perimeter = 2 × (Room Length + Room Width)
2. Strips Needed = ceil(Room Perimeter / Roll Width)
3. Strips per Roll = floor(Roll Length / Room Height)
4. Total Rolls Needed = ceil(Strips Needed / Strips per Roll)
- Enter Room Dimensions: Provide the length, width, and height of your room in feet.
- Enter Roll Dimensions: Input the width and length of a single wallpaper roll in feet.
- Calculate: The tool instantly calculates the total number of rolls you'll need.
Interpreting the Results: Buying Your Rolls
The key result is the **Total Rolls Needed**. This number is an estimate and it's always wise to buy at least one extra roll. This accounts for mistakes, difficult cuts around windows or doors, and ensures you have a spare roll from the same dye lot for future repairs. The breakdown shows how many vertical strips you'll need in total and how many you can expect to get from a single roll.
Common Wallpapering Mistakes
- Not Buying Enough: Forgetting to buy an extra roll is a classic mistake. If you run out, finding a new roll from the same batch (dye lot) can be impossible, leading to noticeable color variations on your wall.
- Ignoring Pattern Repeat: This calculator is for solid or simple-patterned wallpaper. Papers with a large, complex pattern require extra material to align the design from strip to strip. For these, add an extra 15-20% to your order.
- Not Prepping the Walls: Applying wallpaper to unprepared walls (unprimed, dirty, or damaged) will result in poor adhesion and a bumpy, unprofessional finish.
Frequently Asked Questions
How do you calculate how many rolls of wallpaper you need?
First, calculate the total area of your walls (perimeter × height). Then, divide this by the area of one roll of wallpaper (roll width × roll length). It's recommended to add 10-15% for waste and pattern matching. Our Wallpaper Calculator automates this calculation for you.
How many strips can I get from one roll of wallpaper?
To find out how many vertical strips you can get from one roll, divide the roll's length by your room's height. For an 8-foot ceiling and a standard 33-foot roll, you can typically get 4 full strips.
Should I subtract windows and doors when calculating wallpaper?
For a simple estimate, you can often ignore small windows and doors, as the extra wallpaper will be used for waste and pattern matching. However, for large openings like patio doors or bay windows, you should subtract their area for a more accurate calculation.
What is a pattern repeat on wallpaper?
A pattern repeat is the vertical distance on the wallpaper before the design repeats itself. When hanging wallpaper with a large pattern repeat, you will have more waste as you need to cut strips to align the pattern correctly. Always buy extra to account for this.
Tips for Hanging Wallpaper
- Prep is Key: Clean your walls thoroughly and patch any holes or imperfections before you begin.
- Use a Primer: Applying a coat of primer, especially over new drywall or dark colors, will ensure better adhesion and a more even final color.
- Cut In First: Use a brush to paint the edges along trim, ceilings, and corners (a process called "cutting in") before you use a roller on the main wall surfaces.
- Maintain a Wet Edge: To avoid lap marks, always roll into the wet paint you just applied, not onto a dry surface.
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