Free Wallpaper Calculator
How much wallpaper do I need?
Get your exact roll count and a full project cost estimate in 60 seconds. Then go through us for 10% off and a vetted, licensed local installer to get it done right.
Wallpaper Roll Size
Optional. Enter your costs to see installer vs client totals and profit margin.
Used for door/window deductions. Adjust if your project has non-standard sizes.
Walls
Enter wall dimensions
Results appear automatically
How we calculate
Count panels per wall
Wall width ÷ roll width = strips needed. Calculated independently for each wall in each room.
Account for pattern repeat
Each panel cut rounds up to the next repeat. Fewer panels fit per roll = more rolls needed.
Sum per room
Panels ÷ panels-per-roll per wall, summed per room. Same engine the WallFlow dashboard uses.
Frequently Asked Questions
How many rolls of wallpaper do I need for a room?
It depends on wall dimensions, roll size, and pattern repeat. Our calculator uses the panel method — counting exact strips needed per wall — which is more accurate than simply dividing area by roll coverage.
Can I calculate multiple rooms at once?
Yes! Click '+ Add Room' to add as many rooms as you need. Each room calculates independently, and you get a combined total at the top.
What is pattern repeat and why does it matter?
Pattern repeat is the vertical distance between identical points in the wallpaper design. A 25-inch repeat means each panel must be cut at multiples of 25 inches, creating waste. A higher repeat means fewer panels per roll and more rolls needed.
How much waste factor should I add?
Standard practice is 10% for most installations. For complex rooms with many corners, angles, or obstacles, use 15%. For simple rectangular rooms with no pattern, you can use 5% or even 0%.
What size is a standard wallpaper roll?
In the US, standard single rolls are 20.5″ wide × 33ft long (~56 sq ft). European rolls are typically 20.5″ × 27ft (~46 sq ft). Wide rolls are 27″ wide and come in various lengths (15ft, 27ft, 30ft).
Is this calculator accurate for grasscloth and specialty wallpapers?
Yes. As long as you enter the correct roll width, length, and pattern repeat, the panel-based calculation works for all wallpaper types including grasscloth, vinyl, fabric, and murals.
Built by wallpaper installers, for wallpaper installers.
Try WallFlow FreeHow it works
Measure and price
Enter your walls, doors and windows. Get your roll count and a project cost estimate in under a minute.
Get matched with a pro
Leave your ZIP and contact. We match you with a licensed, insured installer near you.
Get it installed right
Your installer confirms the price with your 10% WallFlow discount and gets your walls done clean and guaranteed.
Get it installed by a vetted pro
Patterned and specialty wallpaper is easy to waste and hard to hang clean. We connect you with installers who are licensed, insured, 5-star rated on Google, and guarantee their work - and you get 10% off for coming through WallFlow. Free, no obligation.
Calculate and get matched →Wallpaper calculator FAQ
How much wallpaper do I need?⌄
Measure each wall's width and height, add them up for the total wall area, then divide by the usable area per roll after accounting for pattern repeat and waste. This calculator does all of that for you, including doors and windows, and gives you the exact number of rolls.
How do I measure a room for wallpaper?⌄
Measure the width of every wall and the ceiling height. Enter them here along with any doors and windows. The calculator subtracts the openings, adds a waste factor, and accounts for pattern repeat so you order the right amount the first time.
What is pattern repeat and why does it matter?⌄
Pattern repeat is the vertical distance before a wallpaper design repeats. A larger repeat means more waste, because each strip has to be aligned to the pattern. The calculator factors this in so your roll count is realistic, not just raw square footage.
Should I hire a professional wallpaper installer?⌄
For patterned, large, or specialty wallpaper, a professional saves you material and gives a clean, bubble-free result. We can match you with a licensed, insured installer in your area who is 5-star rated and guarantees their work. It is free and there is no obligation.
Is the wallpaper calculator free?⌄
Yes. The calculator is completely free to use, no signup required. If you want it installed, we can also connect you with a vetted local professional at no cost to you.