Best Wallpaper Calculator

Room Shape:

Room Length (feet):

Room Width (feet):

Wall Height (feet):

Number of Doors:

Number of Windows:

Wallpaper Roll Width (inches):

Wallpaper Roll Length (feet):

Pattern Repeat (inches):

Price Per Roll:

Wallpapering a room can instantly transform its look, but estimating the number of wallpaper rolls you need can be tricky. Overbuying wastes money, while underbuying leads to frustrating delays.

Our Best Wallpaper Calculator simplifies this process by calculating the exact number of wallpaper rolls required and the total cost based on your room’s dimensions and wallpaper specifications. Whether you have a simple rectangular room or walls of custom shapes, this tool provides an easy, accurate solution to plan your wallpaper purchase perfectly.

Why Use the Best Wallpaper Calculator?

Estimating wallpaper requirements involves more than just measuring the wall area. You must consider:

Room shape and size: Rectangular or irregular wall areas.
Wall height and perimeter.
Number of doors and windows, which reduce wallpaper needed.
Wallpaper roll dimensions (width and length).
Pattern repeat that affects usable length per strip.
Waste factor to account for trimming and mistakes.
Price per roll to calculate your total budget.

Our calculator combines all these factors and gives you a precise estimate so you can shop smartly.

How to Use the Best Wallpaper Calculator

Step 1: Select Your Room Shape

Choose Rectangular Room to enter length and width.
Choose Custom Walls if your room has irregular shapes and enter the total wall area directly.

Step 2: Enter Room and Wallpaper Details

Wall Height: Height of walls in feet.
Number of Doors and Windows: Each reduces the wallpaper area needed.
Wallpaper Roll Width: Width of a wallpaper roll in inches (default 20.5″).
Wallpaper Roll Length: Length of the roll in feet (default 33 ft).
Pattern Repeat: If your wallpaper has a repeating pattern, enter the length in inches (enter 0 if none).
Price Per Roll: Cost of each wallpaper roll.

Step 3: Calculate

Click Calculate to see:

Total Wall Area: Overall surface area of the walls.
Net Coverage Area: Wall area after subtracting doors and windows.
Rolls Required: Total number of wallpaper rolls you need to buy.
Total Cost: Estimated expense based on rolls required and price per roll.
Coverage Per Roll: How much area a single roll covers after adjusting for pattern repeats.
Waste Factor: Fixed at 15% to allow for trimming and mistakes.

Example Calculation

Imagine a rectangular room:

Length: 15 feet
Width: 12 feet
Wall Height: 8 feet
Doors: 1
Windows: 2
Wallpaper roll width: 20.5 inches
Roll length: 33 feet
Pattern repeat: 0 inches (no pattern)
Roll price: $30

The calculator will compute the wall perimeter, subtract door and window area, factor in pattern repeat and waste, and tell you exactly how many rolls to buy and how much it will cost.

What Makes This Calculator Special?

Supports Custom Walls: Perfect for irregular or non-rectangular rooms.
Adjusts for Doors and Windows: Avoids overbuying wallpaper.
Considers Pattern Repeat: Accounts for wallpaper matching to reduce waste.
Incorporates Waste Factor: Ensures enough wallpaper is purchased.
User-Friendly Interface: Clear inputs and instant results.
Cost Estimation: Helps budget your purchase accurately.

FAQs About Wallpaper Calculation

1. What is the waste factor?
It accounts for extra wallpaper needed for trimming and mistakes, typically set at 15%.

2. Why include pattern repeat?
Pattern repeats require more wallpaper to align designs perfectly between strips.

3. Can I use this calculator for non-rectangular rooms?
Yes, choose “Custom Walls” and enter total wall area directly.

4. How do doors and windows affect calculation?
Their area is subtracted from total wall space since you don’t wallpaper over them.

5. What if I don’t know my wallpaper roll size?
Check the packaging or ask your supplier for roll width and length details.

6. Is the wallpaper roll width always in inches?
Yes, standard wallpaper widths are measured in inches.

7. Can I change the waste factor?
Currently fixed at 15%, but you can manually add a buffer when purchasing.

8. How do I know if the pattern repeat is important?
If your wallpaper has visible patterns or stripes, pattern repeat matters to align designs.

9. What if my room has alcoves or irregularities?
Use the custom wall area option for more flexibility.

10. Can this tool help with wallpaper cost budgeting?
Yes, by entering price per roll it calculates your total expected expense.

Conclusion

The Best Wallpaper Calculator is an essential tool for homeowners, decorators, and DIY enthusiasts who want to wallpaper confidently and cost-effectively. It removes guesswork, prevents waste, and ensures your wallpaper purchase matches your project needs perfectly. Give it a try and transform your walls with precision!