Wallpaper Calculator

Work out how many wallpaper rolls to buy. Enter a single wall width or a room perimeter, roll width and length, your pattern repeat and match type, plus a small trimming allowance. You can subtract door widths if you like. The tool shows drops per roll and rolls to purchase.

Mode

Run is the total width to cover.

Measure in

Decimals

Wall width ()

Wall height ()

Room length ()

Room width ()

Wall height ()

Walls to paper

Use 1 for a single feature wall in this mode.

Total run to cover ()

Wall height ()

Openings and exclusions

Subtract door widths

Only subtract full-height openings. Windows are usually not subtracted.

Number of doors

Door width ()

UK typical door around 0.76–0.84 m.

Roll width

Common widths: 52 cm (20.5 in) or 53 cm.

Roll length

Typical length 10 m or 33 ft.

Pattern repeat

Set to 0 for no matching.

Match type

Trim allowance per drop

Extra at top and bottom for cutting.

Extra margin (%)

Optional safety margin on rolls.

Run and drop length

Total run to cover:
Drop length used:
Drops needed:

Rolls

Drops per roll:
Rolls (exact):
Extra margin:
Rolls to buy:

Guidance only. Pattern repeats and waste vary by design and installer method. Always confirm with your decorator and supplier.

About this calculator

The calculator totals your wall run, adjusts the drop length for trimming and for the pattern repeat. For straight matches we round the drop up to the next repeat. For half drops we use a repeat of twice the pattern size to keep alignment. Drops per roll are the floor of roll length divided by the adjusted drop length, then we divide required drops by drops per roll and add an optional extra margin before rounding up to whole rolls.

Subtract only full-height openings, such as doors, if you choose to subtract anything. Windows are usually not subtracted, as you still need full drops to match patterns above and below.

Explore more in the calculators hub.