Wallpaper Calculator

Works out how many rolls of wallpaper a room needs from its walls, doors and windows, the roll size and the pattern repeat.

How to use

1. Under "Measure by", choose "Whole room" and enter "Room length", "Room width" and "Wall height", or choose "Wall by wall".
2. Set the number and size of doors and windows, and switch on "Paper the ceiling too" if needed.
3. Pick a "Roll size" or type the "Roll width" and "Roll length" from the label, then set the "Pattern repeat" and "Pattern match".
4. Read "Rolls to buy" and "How it was calculated". For several rooms, press "Add this room to the list", then "Print" or copy the list.

How it works

• By strips (the default): strips = wall perimeter ÷ roll width, rounded up; strips per roll = roll length ÷ strip length, rounded down. A strip is the wall height plus trim, rounded up to whole repeats; a half-drop match adds half a repeat.
• By area: area to paper ÷ roll area. It ignores offcuts, so it gives fewer rolls; both results are shown.
• Presets show their sizes, for example European 0.53 × 10.05 m and US double roll 20.5 in × 33 ft. Paste and lining paper are not calculated. The room list stays in this browser on this device.

Questions and answers

How many rolls of wallpaper do I need for a 12x14 room?

With 8 ft walls and 20.5 in × 33 ft double rolls the room needs 31 strips. With 4 in of trim each roll gives 3 strips, so 11 double rolls; with no trim it gives 4, so 8.

How many square feet does a double roll cover?

A 20.5 in × 33 ft double roll is about 56 sq ft, but offcuts mean less wall is actually covered.

What is a half-drop match?

Each strip starts half a repeat lower than the one next to it, so every strip needs half a repeat more paper.

Should I subtract doors and windows?

In the strip method only openings wider than a strip remove a strip. The area method subtracts their full area.