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You're in at the deep end there. It's fine calculating the overall sq. meters (+the usual 10%) but you also have to allow for the pattern overlap and take into account the diagonal cuts on the staircase which burn through a fair bit of paper. Probably easier to buy enough to do a part of the job and see how you go, you'll have a better idea of how much coverage/wastage after you've done a bit.
Sods law dictates that no matter how you calculate it you'll either need 6 inches more than you have or there will be a roll left over.
Airhead
@CYOA
Being coerced into wallpapering a stairwell. I've been quite happy with an unpainted/unplastered mess for the past 2/3 years but what do I know? I haven't wallpapered since I was about 10 years old and this seems like jumping in at the deep end.
It's an 'open plan' staircase that is also in the living room so it would be the area above and below the stairs themselves.
It's a patterned wallpaper - 10m x 53cm with a repeat at 53cm.
The wall/ceiling is kind of staggered/ divided into boxes on the way up. Measurements are:
Ground floor to ceiling: 240h x 120w (the last 30 or 40cm see the stairwell start to creep in.
Stairwell first section: 240h x 85w (240 is the max height)
Stairwell top section: 330h x 220w (330 is the max height and there's also a fairly significant window in this space):
Underneath the staircase: 220h x 240w (220 being the max height right)
How would I work out the number of rolls required from the above measurements?