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Multiply the length with the width (LxW). Do this to all the walls that you want to put wallpaper on. If there is a door or a window in the wall, then calculate the area that is taken up by it using the same formula as before. Subtract this from the area of the wall. Add all of the sums together, and you should have the amount of wallpaper nedeed for a room in square cm/m (Ft for Americans).

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