How To Measure For Wallpaper Calculator

How To Measure For Wallpaper Calculator

How To Measure For Wallpaper Calculator

Introduction to Wallpaper Measurement

Wallpapering a room is a fantastic way to inject color, pattern, and personality into your home decor. However, one of the most critical stages of the wallpapering process is determining how much wallpaper you will need. This article presents the steps and guidelines for you to calculate your requirements accurately.

Understanding Wallpaper Measurements

Wallpapers typically come in rolls. The size of these rolls may vary depending on the country of origin. For instance, in the United States, a standard wallpaper roll measures approximately 27 inches wide and 33 feet long. However, it's always important to check the exact dimensions from the retailer or the product descriptions.

Areas Not to Be Wallpapered

You also need to consider certain areas of your room that do not require wallpaper, such as doors, windows, and wardrobes. Subtracting the total area of these from the overall room area will give you an accurate measurement of the wallpaper required.

Pattern Repeats

One important factor to consider while measuring for wallpaper is the pattern repeat. The repeat signifies the vertical distance between one point on a design to the same point again. If the wallpaper you selected has a large pattern repeat, you may need more rolls to match the patterns perfectly.

How to Calculate Wallpaper

To estimate how much wallpaper you need, you'll first measure the width and height of each wall. Then, multiply the width by the height to get the area of the wall. Remember to subtract the areas not to be wallpapered.

Factor in Extra for Mistakes

As with any home improvement project, mistakes can happen. If you're hanging wallpaper for the first time, or if your walls are irregular or hard to measure, you might want to add an extra roll or two to your calculation. This will ensure you have enough wallpaper, just in case.

Using a Wallpaper Calculator

To simplify the process, use a wallpaper calculator. After entering the measurements of your walls and the size of the wallpaper rolls, the calculator will estimate the number of rolls you need.

Remember, these calculations are estimates and actual usage may vary depending on the project. Always consult with a wallpaper professional if you're unsure.

Understanding Wallpaper Specifications

One of the critical aspects in measuring for wallpaper is understanding wallpaper specifications. Various specifications including wallpaper width, matchup style and pattern repeats influence the amount of wallpaper you need to purchase. This section will thoroughly explain these terms so that you are equipped to make an accurate estimation.

Wallpaper Width

The overall measurement of the roll from one end to the other is termed as the wallpaper width. Usually, the standard roll widths are approximately 20.5, 27, and 36 inches. However, European wallpapers usually are wider from about 21 inches. Knowing the roll width is essential as it helps to determine the number of wall lengths (strips) you can get from each roll.

Matchup Style

The wallpaper pattern match refers to the way the pattern aligns across the wallpaper sheets. There are three common types: random match, straight match, and drop match. A random match is where the pattern matches no matter how the sheets are aligned. A straight match means that each strip has the same pattern at the top. In a drop match, every other strip is the same at the top. Understanding the matchup style affects your wallpaper quantity as certain patterns require more wallpaper to match the sequences.

Pattern Repeat

A pattern repeat refers to the vertical distance between where the pattern is identical again (repeats). It is crucial for calculating wallpaper quantities because it directly relates to the amount of waste you'll have. Smaller or no repeat will result in less waste, while larger repeats will result in more waste as you need to align the patterns.

Determining Wallpaper Length

Once you have these measurements and understand these terms, you can determine the required length of wallpaper. Measure the height of your walls, from the ceiling to the baseboard, to get the length of each wallpaper strip you'll need. Remember to add extra for trimming. You'll need to add the pattern repeat to your wall height if you're using a straight or drop match pattern, to ensure that you have enough to line up the pattern correctly.

Calculating the Number of Rolls

With these specifications and measurements in hand, you can calculate how many rolls of wallpaper you'll need. Divide your total wall area in square feet by the total square footage a roll of wallpaper covers. Pay close attention to match styles and repeats, as these may require additional rolls. Always round up to the nearest roll and consider getting an extra roll for potential mistakes or future repairs.


Understanding the wallpaper specifications and how they figure into measurements is vital before beginning a wallpaper project. It ensures that you purchase the correct amount of wallpaper, reducing waste and saving money. Remember to always measure twice and order once.

Tools Required for Measuring Your Wall Space

When preparing for a wallpaper job, accuracy is crucial, especially when it comes to measuring your wall space. By accurately measuring the room, you can ensure you purchase the correct amount of wallpaper, thereby avoiding wastage or shortage. Here are the main tools you'll need to accomplish this:

Tape Measure

A tape measure is a fundamental tool required for obtaining precise wall measurements. Ensure your tape measure is long enough for the walls you're measuring, and that it's accurate and easy to read. A metal tape measure is usually preferred over cloth or plastic varieties, as it is less prone to stretching and gives the most accurate measure.

Step Ladder

The step ladder will be necessary if you have high walls. It will allow you to reach the upper part of your walls and measure from the floor to ceiling accurately. Ensure that the ladder is sturdy and in good condition to prevent any accidents due to instability.

Notebook and Pen

As you measure your walls, you'll need to note down your measurements right away to avoid any chance of forgetting. A pen and a trusty notebook are therefore essential. Any note-taking device can work, but a regular pen and paper usually suffice.


Once you have all your measurements, you will need a calculator to add up your measurements and calculate the quantity of wallpaper required. This will depend on the dimensions of the wallpaper rolls you intend to purchase.


Few can deny that an extra set of hands tends to make work lighter. When measuring large or high spaces, having an assistant to hold the ladder or the other end of the tape measure can make the task easier and safer.


A level tool can be handy when you're measuring walls for wallpaper. This will help to ensure you’re keeping your measuring tape straight, leading to more accurate measurements.

Necessity of Each Tool

Each tool can streamline the measuring process and helps to increase accuracy, a key factor in getting the right amount of wallpaper. Using these tools, you should be able to effortlessly measure your space and determine the exact amount of paper you’ll need for a successful wallpaper application.

Step-by-Step Guide to Measuring Wall Dimensions

If you want to wallpaper a room, a crucial task is to measure the walls with precision. The amount of wallpaper you will require corresponds directly to the surface area of your walls. Therefore, to avoid purchasing too little or too much wallpaper, you need to take precise measurements.

Gather the Necessary Tools

The first step to calculating how much wallpaper you require is to gather the appropriate tools. These include:

  • A measuring tape - Ideally, your tape should be long enough to measure from floor to ceiling without any interruption.
  • A pen and paper - You'll need to note down your measurements.
  • A calculator - This will enable you to calculate the wall area promptly.

Measure the Width and Height

Proceed to measure the width of the wall, from corner to corner. Note down this figure. Then, measure the height from the floor to ceiling. Various walls may not have the same width or height, based on the design of your living space, therefore make sure to measure every single wall.

Door and Window Areas

Remember to subtract the area any doors or windows occupy from the overall area of the wall. To get these measurements, you need to measure the height and width of each door or window and multiply those two measurements to get the area.

Calculating Total Wall Area

Once you have your measurements in place, calculation of the amount of wallpaper needed is straightforward. For every wall, multiply the width by the height to find the total area of each surface. Deduct the areas of doors and windows from the respective walls. The sum of all these figures will provide the total wall area.

Adjust for Waste

When applying wallpaper, there is typically some waste due to patterns aligning and trimming. To account for this, add an extra 15% onto the total wall dimensions. This figure should give you the right amount of wallpaper to cover your walls whilst accounting for any unavoidable waste.

Use a Wallpaper Calculator

If you find the manual calculation to be complicated, consider using an online wallpaper calculator. Input the measurements you've taken, and the calculator will instantly provide the precise amount of wallpaper required.

Measuring for wallpaper can seem a daunting task initially, but by following these steps, you are sure to get accurate results which will make the process a lot smoother.

Accounting for Windows, Doors, and Other Obstructions

As you take measurements of the room, it's essential to consider windows, doors, and other obstructions that may alter your wallpaper needs. Including these elements in your calculations ensures you do not order excess wallpaper, helping to save resources and money.

Why It's Important

Due to the presence of doors, windows, and other architectural features, the total area that needs to be covered typically won't need full strips of wallpaper. Though each has a surface area, it isn't usually advantageous to include these obstructions in your main wall calculation as the wallpaper won't be applied here.

Measuring Windows and Doors

Start by measuring the width and height of each window and door, then multiply to find the total square footage. Once you've done this for all windows and doors, add these numbers together. This calculation gives you the total square footage of your obstructions.

Other Obstructions

In addition to windows and doors, don't forget other obstructions like built-in bookcases, fireplaces, or large appliances if you're wallpapering a kitchen or bathroom. Measure these as you would a window or door.

Deducting the Obstructions from the Total Wall Area

Once you have the total square footage of all obstructions, this number is subtracted from your total wall area. This resulting figure will provide a more accurate estimation of the amount of wallpaper you'll need.

A Worked Example

For example, if you've calculated that your room's total wall area is 500 square feet, and your doors and windows sum up to 100 square feet, then the actual area you will need to wallpaper is 400 square feet. Thus, you'd save the cost of wallpapering 100 square feet.

Calculating Waste

When calculating your wallpaper needs, factor in a bit of waste. A general rule is to add an additional 15% to your wallpaper order to account for cuts, pattern matching, and potential mistakes.


Correctly calculating the amount of wallpaper needed can save you from purchasing too much or too little, avoiding unnecessary expense, minimizing waste and ensuring a successful wallpaper fitting.

Calculating Your Wallpaper Requirements

Once you have completed all your measurements, the next step is to calculate the amount of wallpaper you will need. This may seem complex, but with the right approach, it can be incredibly straightforward.

Understanding Roll Dimensions

Firstly, it's essential to understand the dimensions of your wallpaper rolls. Normally, a standard size wallpaper roll is around 10 meters long by 0.53 meters wide. However, this differs based on the manufacturer, so always check the dimensions on the packaging or product description.

Calculating the Number of Drops

With your roll dimensions and room measurements on hand, begin by calculating the number of 'drops' you will need. A drop refers to a strip of wallpaper that runs from the ceiling to the floor. You will calculate this by dividing the total wall length (in meters) by the wallpaper width. Be sure to round up to the next whole number to account for pattern matching and slight miscalculations.


If your room circumference is 24 meters, and your roll width is 0.53 meters. Your calculation would be 24 ÷ 0.53 = 45.28 - you round this up to 46. Therefore, you would need a minimum of 46 drops.

Calculating the Number of Rolls

The next step is to calculate how many rolls of wallpaper you will require. To calculate this, you need to know how many drops you can get out of a single roll. You do this by dividing the length of the roll by the height of your room. After this, you'll divide the total drops by the number of drops per roll.


If your room height is 2.5 meters and your roll length is 10 meters, you can get 4 drops out of a single roll (10 ÷ 2.5). If you need 46 drops in total, you will need 12 rolls of wallpaper (46 ÷ 4 = 11.5 and rounding up to the nearest whole number).


Keep in mind that these calculations provide a rough estimate. Variables such as complex room shapes, windows, doors, or pattern repeats may require additional wallpaper rolls. It's always better to overestimate and have extra than to find yourself short of wallpaper during the application. Another safe practice is to buy an additional roll for future repairs, if possible.

Tips to Avoid Common Measurement Mistakes

When measuring the room for wallpaper, even minuscule errors can have significant repercussions. By avoiding common mistakes in measurement, you can ensure that you get the correct quantity of wallpaper, saving both time and resources. Below we provide tips on how to avoid these usual pitfalls.

Ensure Consistent Measurement Units

One of the most common mistakes is the inconsistent use of measurement units. It's essential to ensure that the units you use when measuring your walls are the same as those used by the wallpaper manufacturer. Consistency is key in avoiding miscalculations. Consider investing in measure tapes that display both metric and imperial units for more flexibility.

Account for Window and Door Spaces

Another usual error is forgetting to subtract the areas occupied by windows and doors from the total wall area. However, there is a balance to be struck here. If you deduct too much, you may end up short of wallpaper. A good rule of thumb is to subtract half the area of windows and doors, as you'll likely need to paper over parts of these areas for a smooth finish and pattern continuity.

Consider Unusual Room Shapes

If your room isn't a perfect rectangle, it requires a little more work to ensure accurate measurements. Sloped ceilings, chimney breasts or alcoves can all complicate the process. In such cases, it's handy to divide the room into smaller rectangular or square segments before calculating the area. These individual areas can then be added together to provide a final total.

Remember Pattern Repeats

For wallpaper with a repeating pattern, small miscalculations can result in patterns that don't line up correctly, ruining the aesthetic effect. Always account for pattern repeats in your calculations, and ensure that you have enough extra to match up the design. The wallpaper label should provide information on pattern repeat lengths.

Factor In Extra for Mistakes

Last but not necessarily least, it's highly advisable to always add on a bit extra to your measurements to allow for errors in application. Even an experienced wallpaper hanger might make a mistake or two. Having a small buffer can make the difference between a finished project and an unfinished one.

Ensuring the Best Results in Wallpaper Installation

Wallpapering a room is a task that demands a detail-oriented approach. To ensure the best results in wallpaper installation, obtaining accurate measurements is absolutely crucial. This process becomes seamless by using a wallpaper calculator, warding off excess wastage and unnecessary expenses.

Tips for Precision Measurement

Start by measuring the height and width of each wall, remembering to include doors and windows as part of the total area, as wallpaper will need to overlap these to create a uniform appearance. If the room has unusual features or alcoves, measure these separately. Always add 10 to 15% to your final measurement to account for pattern repeat waste and unexpected hiccups.

Benefits of a Wallpaper Calculator

The use of a wallpaper calculator can expedite and simplify this process. It gives you an accurate estimate of the number of wallpaper rolls you’ll need, considering factors such as the wallpaper's width, length and pattern repeat. This way, you'll sidestep issues like shortages and overestimations.

Making a Wise Investment

By taking the extra time to measure and calculate precisely before making your wallpaper purchase, you ensure it’s an investment rather than an expenditure. Detailed planning and calculations can save you the hassles of return trips to the shop or the undesirable strip of wall left uncovered.

Key Takeaway

Even as a seasoned wallpaper enthusiast or first-time DIYer, appropriate measurements and understanding of wallpaper calculations are the pillars of perfect wallpaper installation. When done right, wallpaper can completely transform your space and elevate your interiors.