How Many Rolls Of Wallpaper Do I Need? Use The Wallpaper Calculator

Wallpaper Cost:

Single roll wallpaper cost

$ per roll

 

Decorative trim cost

$ per roll

 

Trim room with decorative border?

Room Size:

Wall Height

feet

Room Width

feet

Room Length

feet

Calculated Results:

Area of wallpaper required

square feet

Length of decorative border trim required

linear feet

Single rolls of wallpaper required

single rolls

Double rolls of wallpaper required

double rolls

Rolls of decorative border trim required

rolls

Expense of wallpaper required

$

Expense of decorated trim required

$

Why Use a Wallpaper Calculator

For most families, the first step in planning a decorating project is figuring out the cost. A wallpaper calculator makes that easy by showing you exactly how many rolls you’ll need, how much it will cost, and whether you’ll need extra trim or border material. Instead of stressing over measurements and math, you can focus on creating a beautiful space.

Simply enter the price of your chosen wallpaper, borders, or murals, and the calculator gives you an instant estimate. Whether you’re wallpapering a ceiling, purchasing wallpaper for an accent wall, or mixing solids with patterns, this tool helps you compare costs quickly and stay on budget. With the numbers handled, you’ll have more time to enjoy the fun part—choosing colors, patterns, and designer styles you love.

How Many Square Feet in a Roll of Wallpaper?

On average, wallpaper covers the following amounts:

• Single roll – about 27 square feet (usually not sold individually)
• Double roll – about 54 square feet (the most common packaging)
• Triple roll – about 81 square feet (less common, often for murals or large spaces)

Our wallpaper calculator factors in these numbers automatically so you don’t have to. If you’re working with a design that has a large pattern repeat, you may get slightly less usable coverage. When in doubt, contact us! We’ll help you with your wallpaper estimate.

How Does the Wallpaper Estimator Work?

Our wallpaper estimator determines the approximate amount of wallpaper you’ll need, the total area to be covered, the number of rolls, and any optional trim required for your room. It automatically calculates everything based on the dimensions and costs you enter. The calculator does not subtract areas for doors or windows since trimming usually requires just as much material as covering them. Remember, this tool is a guide—results are rounded up, just as you should when budgeting. It’s always better to have a little extra wallpaper than to run out mid-project.

Because of cuts, pattern matching, and unusable ends, wallpaper rolls are generally considered 85–95% usable. The smaller the pattern repeat, the less waste you’ll have. Border rolls follow a similar rule, though most people want their borders uncut, so waste can be higher. For longer walls (over 15 linear feet), you may need a longer roll or a splice.

To use the estimator, start by measuring the room(s) you intend to decorate. Measure the linear feet along the wall and the ceiling height. Enter the room dimensions along with the wallpaper cost per roll (listed on every product page). The estimator instantly calculates how many rolls you’ll need and your total cost. To try another wallpaper or room, simply adjust your numbers and compare results.

Example Wallpaper Calculation

If you want to wallpaper a 12 ft. by 15 ft. room with 9 ft. ceilings, that’s 432 square feet of wall space. Since one roll covers about 27 square feet (with 85–95% usable), you’ll need around 16 rolls. At $50 per roll, your project will cost about $800. Our calculator does this math for you automatically—making it easy to plan, budget, and choose the perfect wallpaper.

Wallpaper Trim Calculator and Guidelines

Adding decorative trim is an easy way to enhance your wallpaper design. Our wallpaper trim calculator helps you estimate exactly how much trim you’ll need for your project.

• Single or multiple strips: The calculator measures for a single strip. If you plan to install two or three strips, simply double or triple the amount.
• Roll lengths: Trim rolls are generally 15 linear feet long.
• Placement considerations: Calculations assume trim will be installed at the ceiling, avoiding doors or windows. If you place trim mid-wall or near the floor, extra material may be required due to interruptions from doors, windows, or cabinetry.
• Pro tip: Decorative trim is best measured and cut carefully, just like wallpaper, to ensure a seamless, polished appearance.

By keeping all trim information together, you can plan your purchase, avoid running short, and confidently install decorative accents to complement your wallpaper.

How Is Wallpaper Packaged and Sold?

Most wallpaper is priced by the roll, though it’s typically packaged and sold in double rolls. It’s always a good idea to purchase a little extra to avoid running short, especially when using patterned wallpaper that requires matching seams. Depending on the pattern repeat, you may need 25 to 70 percent more wallpaper than your initial calculations to ensure a seamless look. A standard roll generally covers about 27 square feet, and for large or complex repeats, our wallpaper calculator or customer service can help you determine the exact number of rolls needed. Always check the run numbers or lot codes on each roll to ensure color consistency, since printing batches can vary slightly. Our wallpaper calculator automatically rounds up and factors in the usable portion of each roll, helping you plan your project accurately and avoid running out of wallpaper while staying on budget.

Why Wallpaper Run Numbers Matter

When purchasing wallpaper, always check for:

• Run numbers / lot numbers / run codes on the label or roll
• Matching codes across all rolls to guarantee color consistency
• Awareness that wallpapers are printed in batches, so shades can vary between different runs

To help prevent shortages, our calculator rounds up based on the average usable amount in each roll. It’s just one of the ways Wallpapers To Go makes redecorating easier and more reliable.