Wallpaper Calculator
Estimate wallpaper rolls for a wall or accent area. Enter wall dimensions, standard roll width and length, and a waste allowance.
FAQ for this calculator
- What is a standard US roll?
- Many single rolls are ~21 in × 33 ft—double rolls are twice the length. Verify your SKU.
- How much waste for patterns?
- Large repeats may need 15–25% extra—this tool uses a flat waste % you choose.
- Subtract doors and windows?
- Not automatically—increase waste or measure net wall sections separately.
- Peel-and-stick vs paste?
- Roll math is the same—coverage depends on roll dimensions, not adhesive type.
How to use the wallpaper calculator
Wall area divided by roll area (with waste) gives rolls needed, rounded up.
- Measure wall width and height in feet.
- Confirm roll width in inches and length in feet.
- Add waste for pattern matching and mistakes.
When to use this calculator
- Accent wall in a bedroom or dining room.
- Powder room refresh with bold print.
- Comparing single vs double roll listings.
Examples & walkthrough
- 12 ft × 8 ft wall, 21 in × 33 ft rolls, 10% waste → about 2 rolls.
- Larger 15 × 9 ft wall → scale rolls up with area.