A free wallpaper calculator that counts strips and rolls, with the pattern repeat.
Work out how many rolls of wallpaper a room takes, with the pattern repeat counted.
Your numbers
The roll's width, length and pattern repeat are on its label. Use 0 for a plain paper with no repeat.
Your result
Fill in the fields above to see your result.
Embed this tool on your site
Paste the code into any page: WordPress, Webflow, Squarespace, Ghost or plain HTML. It's free with the credit under it, which links back to navid.me.
This free wallpaper calculator works out how many rolls a room takes, from the roll's width, length and pattern repeat.
It counts strips, the way you hang it, rather than dividing areas, so the pattern repeat is counted.
I built it because the area method comes up short on patterned paper, where each strip loses a little to line the pattern up.
Here's the method, a worked example, and the mistakes to avoid.
TL;DRKey takeaways
What is a wallpaper calculator?
A wallpaper calculator turns a room's size and the roll's label into the rolls to buy.
It works in feet and inches, or meters and centimeters.
How wallpaper is counted
Strips are counted at full height, doors and windows included, which leaves spare for the pieces around them.
- Strip
- 8 ft
- Strips a roll
- 4
- Rolls
- 7
- Strip
- 9.75 ft
- Strips a roll
- 3
- Rolls
- 9
A worked example
Here's the example the calculator loads: a 12 by 10 foot room, 8 foot walls, rolls 20.5 inches wide and 33 feet long, and a 21 inch repeat.
The perimeter is 44 feet, or 528 inches. 528 ÷ 20.5 = 25.8, so 26 strips. Each strip is 9.75 feet, so a roll gives 3. 26 ÷ 3 = 8.7, so 9 rolls.
Mistakes to avoid
These are the slips that come up most.
- Dividing the wall area by the roll's area
- Forgetting the pattern repeat
- Rounding the strips a roll gives up instead of down
Who is the wallpaper calculator for?
It's for anyone papering a room or a feature wall, and these tools help around it.
- Paint calculator – for the walls you paint instead
- Square footage calculator – for any area
- Flooring calculator – for the floor
Count by strips, and the pattern lines up to the last roll.
Plan your money with your AI
Take your numbers further in
Wallpaper Calculator FAQs
Questions about the wallpaper calculator? Here's what to know.
A wallpaper calculator works out how many rolls a room takes, from the roll's size and pattern repeat.
Work out the strips a roll gives and the strips the room needs, then divide.
It's the height after which the pattern starts again, printed on the roll's label.
Its length ÷ (wall height + repeat), rounded down.
No, it counts every strip at full height, which leaves spare for the pieces around them.
With 8 foot walls and rolls 20.5 inches by 33 feet, 7 rolls with no repeat, or 9 with a 21 inch repeat.
Yes, switch to meters and type the roll in centimeters and meters.
Yes, it's free with no sign-up.
It runs in your browser, and your numbers stay on your device.
I did.
I'm Navid Moazzez, and I made the wallpaper calculator as one of my free tools on navid.me.
More about me.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
Related calculators
More free tools
X
Bluesky
LinkedIn
Threads
Mastodon
Instagram
TikTok
Pinterest
YouTube
Related MCP servers & CLIs
Substack
Apple Podcasts
Free AI newsletterThe most actionable AI newsletter for founders
Every week, get proven AI strategies, curated tools, and step-by-step systems to grow your audience, create better content, and build a profitable creator business.
No fluff, no filler, no BS. Just five minutes each week that might level up your online business and life.
P.S. Sign up now to get free access to my ultimate AI tools guide for creators.
