Wallpaper Calculator
Work out how many rolls of wallpaper a room needs from wall width, height, roll size and pattern repeat.
Rolls to buy
8
- Strips needed
- 24 strips of 100 in
- Strips per roll
- 3
- Wall area to cover
- 320 ft²
Buy every roll from the same batch (dye lot), and an extra roll for mistakes and future repairs.
Show the work
Strips, rounded up
strips = ⌈(walls − skipped) × 12 ÷ roll width⌉
⌈(40 − 0) × 12 ÷ 20.5⌉ = 24
Strip length
strip = height × 12 + trim
8 × 12 + 4 = 100 in
Whole strips per roll
per roll = ⌊roll length ÷ strip⌋
⌊396 ÷ 100⌋ = 3
Rolls, rounded up
rolls = ⌈strips ÷ per roll⌉
⌈24 ÷ 3⌉ = 8
How it works
Strips = ⌈wall width ÷ roll width⌉; strip length = height + trim, rounded up to whole pattern repeats; strips per roll = ⌊roll length ÷ strip length⌋; rolls = ⌈strips ÷ strips per roll⌉
Questions
- How does the wallpaper calculator work?
- Strips = ⌈wall width ÷ roll width⌉; strip length = height + trim, rounded up to whole pattern repeats; strips per roll = ⌊roll length ÷ strip length⌋; rolls = ⌈strips ÷ strips per roll⌉.
- What do I need to enter?
- Total width of the walls, Wall height, Width of doors and windows to skip, Roll size, Roll width, Roll length, Pattern repeat, Trim allowance per strip. Optional fields can be left blank.
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