How to calculate how much wallpaper you need for a room

Written by andrea hermitt
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Most people make a wild guess at how much wallpaper they need. Calculating wallpaper for your room need not be a guessing game. These instructions will show you how to calculate how much wallpaper you need for your room.

Skill level:


  1. 1

    Determine the square footage of the room. Measure each wall in the room and multiply the length times the width of each wall to determine the square footage. Subtract the square footage of the windows and doors to determine the actual square footage of the room.

  2. 2

    Determine the square footage of a single roll of wallpaper. The square footage of your wallpaper roll will depend on the width of the roll with varies from designer to style. If you order your wallpaper from a design centre, they will be able to tell you how much square footage each roll covers. If you are purchasing stock rolls of wallpaper, the square footage will be on the label of the wall.

  3. 3

    Divide the square footage of the room by the square footage of the wallpaper to determine the number of rolls you need.

  4. 4

    Consider the pattern of the wallpaper. The pattern on your wallpaper roll will determine how much extra wallpaper you need in order to ensure pattern match from panel to panel. A subtle or small pattern means you will need just the normal 10 per cent extra wallpaper. A large-scale pattern or bold plaid or other pattern will mean you need another 10 per cent of extra wallpaper.

  5. 5

    Remember that wallpaper is always sold by the double roll. This is important when you are ordering wallpaper from a design centre. If you determine that you need 11 rolls of wallpaper, you will need to order 12 double rolls.

Tips and warnings

  • Read your wallpaper roll to find out if you need adhesive

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