Wallpaper Calculator
Estimate wallpaper for a room. Enter the wall dimensions, subtract windows and doors, and choose your roll size to get the number of rolls needed — with extra built in for pattern matching — and an estimated cost.
Your project
Estimate
Rolls needed · Includes pattern allowance
- Wallpaperable area
- 333ft²
- Estimated material cost
- $560.00
Estimates are guidance only and exclude tax, labor, and site conditions unless stated. Confirm with a local pro.
How it's calculated
No black boxes — here is the exact math behind your estimate, so you can check it or adapt it for your own quote.
- 1
Wall area = 2 × (length + width) × height - 2
Openings = windows × 15 + doors × 21 - 3
Wallpaperable area = wall area − openings - 4
Rolls = ⌈ (wallpaperable area × (1 + waste% ÷ 100)) ÷ usable roll coverage ⌉
Worked example
A 12 ft × 12 ft room with 8 ft walls, 2 windows, 1 door, using single rolls.
Inputs
- Room length
- 12 ft
- Room width
- 12 ft
- Wall height
- 8 ft
- Windows
- 2
- Doors
- 1
- Roll size
- 25
- Pattern / waste allowance
- 15 %
- Price per roll
- 35 $/roll
Result
- Rolls needed
- 16 rolls
- Wallpaperable area
- 333 ft²
- Estimated material cost
- $560.00
Tools & materials for this project
As an Amazon Associate we may earn from qualifying purchases, at no extra cost to you.
- Peel-and-stick wallpaper Beginner-friendly, removable wall coverings.
- Wallpaper smoothing kit Smooth out bubbles and trim edges cleanly.
Compare local pros for wallpaper
An estimate gets you a budget. A few competing quotes get you the real price. Tell us about the job and we'll help you find vetted contractors nearby.
Wallpaper cost by state
The calculator does the quantity math exactly. What it can't know is what a fair unit price looks like where you live — wallpaper runs 61% more in the priciest US market than the cheapest.
Wallpaper cost in all 50 states + DC US average $5.00 per square foot installed · regional averages, full ranked table, and typical project totals.