Wallpaper Calculator: Instantly Measure & Estimate Wallpaper Rolls

Wallpaper Calculator: How Much Wallpaper Will You Need?

Choosing the right wallpaper can transform your room’s look — but knowing how much wallpaper to buy is just as important as picking the perfect design. Overbuying wastes money, and underbuying leads to frustrating delays. That's why we created our Wallpaper Calculator — an easy-to-use tool that helps you estimate exactly how many rolls you'll need based on your wall dimensions, subtracting windows, doors, or any other non-wall areas.

Whether you're wallpapering a single accent wall or an entire room, this calculator saves time, removes guesswork, and gives you confidence before you shop.

How to Measure for Wallpaper

Before jumping into the calculator, it’s essential to gather the correct measurements. Here’s how to do it properly:

Step 1: Measure Each Wall

Use a tape measure to record the width and height of each wall you plan to wallpaper. For better precision:

• In Feet: Measure in feet and inches (e.g., 8 feet 6 inches).
• In Metres: Measure in meters to two decimal places (e.g., 2.45 m).

If your room has more than four walls, don’t worry — our calculator lets you add unlimited walls.

Step 2: Account for Subtractions

Not every part of your wall needs wallpaper. Be sure to subtract the dimensions of:

• Windows
• Doors
• Built-in closets or fixed furniture
  You can add these in the “Subtractions” section of the calculator, and we’ll automatically deduct them from the total.

Step 3: Know Your Wallpaper Roll Size

Wallpaper rolls come in various sizes. Common sizes include:

• Standard UK roll: 52 cm wide by 10 meters long
• Standard US roll: 27 inches wide by 27 feet long

Double-check your wallpaper product details and enter the roll width and length in the calculator using the correct measurement unit (feet/metres).

How to Instantly Calculate Wallpaper with Our Tool (Step-by-Step Guide)

Our Wallpaper Calculator makes it super simple. Follow these steps:

Step 1: Select Your Measurement Unit

Use the dropdown menu to choose between Feet or Metres. All inputs will automatically update to your selected unit.

Step 2: Input Wall Dimensions

Under the “Overall Wall Measurements” section:

• You’ll see Wall 1 to Wall 4 with Width and Height fields.
• Add more walls as needed by clicking “+ Add Wall.”
• Enter dimensions in feet/inches or metres, depending on your selected unit.

Step 3: Add Subtractions

In the “Subtractions - Windows and Doors” section:

• Add the width and height of any Windows, Doors, or Additional Subtractions (like large mirrors or permanent furniture).
• These areas will be automatically subtracted from your total wallpaper area.

Step 4: Enter Wallpaper Roll Size

Under the “Wallpaper Roll Size” section:

• Input the width and length of the wallpaper roll you plan to use.
• Ensure it matches the unit (feet or metres) you selected earlier.

Step 5: Click “Calculate Wallpaper”

Once all fields are filled, click the “Calculate Wallpaper” button. Instantly, you’ll see:

• Total Wall Area (after subtraction)
• Number of Wallpaper Rolls Needed

Our tool uses real-world measurements and converts everything to square feet internally for precise results.

Final Thoughts

Our Wallpaper Calculator takes the stress out of home decorating. It eliminates guesswork and ensures you're never short (or overly stocked) on wallpaper. Whether you're a DIY enthusiast, interior designer, or first-time homeowner, this tool helps you:

• Save time
• Stay on budget
• Shop smarter

Before buying wallpaper, measure, subtract, and calculate — all in one place. Use our calculator today and start your wallpaper project with confidence!