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How to calculate wallpaper

How much do I need?

Just like fabrics, each production batch or "run" or “dye-lot” of wallcovering may have minor color variations from other dye-lots.  For a perfect job all your wallcovering should ideally be from the same dye-lot so we print the “dye-lot number” on the label of each bolt. Ensure all rolls have the same Lot #.

To determine how much wallcovering to buy:

  • Estimate the number of square feet required. 
  • Measure the ceiling height and “round up” to the next foot. Measure the total length of all the walls to be covered and “round up” to the next foot.    
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  • Multiply Height x Total Length = square feet (sf) to be covered. e.g. Ceiling height 8'8”, total length of all walls is 45’ 6”.  
     Call it 9’ x 46’ = 414 square feet
    Deduct 24 square feet for each door or window.  e.g. 2 doors and 3 windows, deduct 120 square feet.   Remainder is 295 square feet. Then add 5% for waste and pattern matching.  e.g. Call it 15 square feet.  Total is 309 square feet.
  • Divide the number of square feet to be covered by the number of square feet in a roll.
  • “Round up” to the next whole numberThis will give the number of rolls required,
     e.g. 309 square feet divided by 54 square feet per bolt = 5.7. Round up to 6 bolts. But depending on the width and height of the walls and considering the pattern repeat, there is a high probability that 6 rolls will not be enough to 
    complete this job. Therefore, in this example, it is recommended to buy 7 rollsю

For a rough estimate on determining how much wallpaper is required, please see the chart below. One Bolt (one Double Roll) = 2 Single Rolls. 


Note – to simplify calculations for door and window allowances, deduct 1/2 bolt for each normal size door or window. Make allowances for design repeat and wastage.



Pretty much all wallpaper borders are sold in what is referred to as a spool. A single spool usually 5 yards long (15 feet). If you were covering 30 running feet of wall, you most likely would need more than 2 spools. This is because you will need to allow for the pattern repeat, and when you go to install the second spool of border you will lose some of the paper when you cut it to match the end of first roll.

Check the product label for exact dimensions.

Subtract pattern repeat from roll length. 

Divide room perimeter by this number and round it up to determine the number of rolls needed.

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