Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Rolls to buy
10
Estimated cost
$650
Strips needed
29
Usable strips per roll
3
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter room perimeter (ft).
- 2Enter wall height (ft).
- 3Enter roll width (in).
- 4Enter roll length (ft).
- 5Enter pattern repeat (in).
- 6Enter price per roll ($).
- 7Read your rolls to buy on the right — it updates as you type.
- 8Hit Share to keep the scenario or send it to someone.
About this calculator
Pattern repeat is the hidden cost: a 21-inch repeat can waste nearly a foot per drop as you match the pattern across strips. Buy every roll from the same dye lot.
Worked example
Using the values the calculator loads with:
Inputs
- Room perimeter: 48 ft
- Wall height: 9 ft
- Roll width: 20.5 in
- Roll length: 33 ft
- Pattern repeat: 12 in
- Price per roll: 65 $
Results
- Rolls to buy: 10
- Estimated cost: $650.00
- Strips needed: 29
- Usable strips per roll: 3
What each field means
Inputs
- Room perimeter (ft)
- The room perimeter used in the calculation, measured in ft. Starts at 48 ft so you have a working example on load.
- Wall height (ft)
- The wall height used in the calculation, measured in ft. Starts at 9 ft so you have a working example on load.
- Roll width (in)
- The roll width used in the calculation, measured in in. Starts at 20.5 in so you have a working example on load.
- Roll length (ft)
- The roll length used in the calculation, measured in ft. Starts at 33 ft so you have a working example on load.
- Pattern repeat (in)
- The pattern repeat used in the calculation, measured in in. Starts at 12 in so you have a working example on load.
- Price per roll ($)
- The price per roll used in the calculation, measured in $. Starts at 65 $ so you have a working example on load.
Results
- Rolls to buy
- Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Estimated cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Strips needed
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Usable strips per roll
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the wallpaper calculator work?
Pattern repeat is the hidden cost: a 21-inch repeat can waste nearly a foot per drop as you match the pattern across strips. Buy every roll from the same dye lot. The underlying maths is: Strips per roll = Roll length ÷ (Wall height + repeat). Rolls = Total strips ÷ Strips per roll.
What do I need to enter?
6 values: room perimeter, wall height, roll width, roll length, pattern repeat, and price per roll. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the rolls to buy result mean?
It is returned as a whole number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Wallpaper Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/wallpaper
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/wallpaper" target="_blank" rel="noopener">Wallpaper Calculator — RevenueLab</a> (2026).</p>
Source: [Wallpaper Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/wallpaper) (2026).