Not the easiest  thing to do so we've found a link to this page on wallpaperdirect that will help.

All you need to do is put in the measurements and it'll tell you how many rolls of wallpaper you'll need for your room or feature wall. Once you've got the number of 'drops' per wall it's a good idea to draw them out and work out where you might like 'column' or 'roundels' patterns and whether you want the 'roundels' staggered or next to each other. Have a look at the 'Products and special offer' page to get some ideas....

While you're there why not have a look at all the wonderful wallpapers they have in stock .



Wallpaperdirect estimator