Take a tape measure pull out 21 inches and walk round the room counting how many drop youl need then divide by 3 or four if the ceiling is low and theres no pattern to match
Or do the same thing with a roll of paper....
Or measure the perimeter of the room in metres then divide this by .52 then divide by 3 or 4
Dont try and work it out by the square metres its difficult to get an acurate answer.
Or use a wallpaper calculating chart...im sure theres one on the net somewhere...but personally I dont find them acurate either,
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