Wallpaper Calculator
Rolls needed, allowing for pattern repeat.
Enter your values
Enter the room perimeter in ft.
Enter the wall height in ft.
Enter the pattern repeat in in.
Enter the roll width in in.
Enter the roll length in ft.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Rolls needed
- 10
- Total drops
- 29
- Usable drops per roll
- 3
- Drop length with repeat
- 10 ft
Quick answer
Roll count depends on drop length: a standard roll gives fewer usable drops as the pattern repeat grows.
At a glance
| What it does | Rolls needed, allowing for pattern repeat. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Room perimeter, Wall height, Pattern repeat, Roll width, Roll length |
| Main output | Rolls needed |
| Cost | Free — no sign-up, no download |
How to use the Wallpaper Calculator
- 1Measure the room perimeter and wall height.
- 2Enter the pattern repeat from the roll label.
- 3Read the number of rolls required.
Inputs explained
- Room perimeter(ft)
- Enter the room perimeter in ft.
- Wall height(ft)
- Enter the wall height in ft.
- Pattern repeat(in)
- Enter the pattern repeat in in.
- Roll width(in)
- Enter the roll width in in.
- Roll length(ft)
- Enter the roll length in ft.
Worked example
Using the values the calculator loads with:
Inputs
- Room perimeter48 ft
- Wall height9 ft
- Pattern repeat12 in
- Roll width20.5 in
- Roll length33 ft
Results
- Rolls needed10
- Total drops29
- Usable drops per roll3
- Drop length with repeat10 ft
Frequently asked questions
Why does pattern repeat waste paper?
Each drop must start at the same point in the pattern, so up to one full repeat is trimmed off every drop.
Should I deduct doors and windows?
Only for very large openings. Most decorators paper over the full perimeter to keep the pattern aligned.
What do I need to enter into the Wallpaper Calculator?
Just 5 values: room perimeter, wall height, pattern repeat, roll width, roll length. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Wallpaper Calculator work out the answer?
Roll count depends on drop length: a standard roll gives fewer usable drops as the pattern repeat grows. The working is shown step by step so you can verify the result by hand.
Is the Wallpaper Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.