Wallpaper Calculator

How many rolls of wallpaper do I need?

ft
ft
ft
in
ft
in
doors
windows

Order this much of wallpaper (20.5 in × 33 ft)

8rolls

A US double roll is about 20.5 in × 33 ft. Each strip adds one pattern repeat and 4 in for trimming. Only full strips count, so leftovers are not assumed usable.

23 strips, 3 per roll (shade = roll) · Showing 17 of 23Cut 9.3 ft each, orange = match and trim
Strips23
Cut length9.33 ft
Full strips per roll3
Wall run covered38 ft

Wallpaper is figured by strips, so a big pattern repeat costs you real length even on a small wall.

How it works

Wall run ÷ roll width gives strips. Each strip is the height plus one repeat plus 4 in. Rolls = strips ÷ full strips per roll.

Before you order

  • Buy every roll from the same run so color matches.
  • Hang from a plumb line, not a corner, since walls are rarely straight.
  • Start where a mismatch will hide, often behind a door.

Common questions

What is a double roll?

In the US, wallpaper is priced by the single roll but sold in double rolls, about 20.5 in by 33 ft or 56 sq ft.

How does pattern repeat change the order?

Each strip must line up with the next, so a larger repeat wastes more length per strip and can cut how many strips a roll gives you.