Abstract: A levelling device formed from a single sheet of foldable material which is used to convert an automobile seat into a flat, horizontal surface. More particularly, the levelling device comprises front and rear straight edges, two side edges each configured in the form of stretched "Z" and at least one scored line parallel to the rear straight edge such that the scored line can be folded downward to form a support leg. In a preferred embodiment, the levelling device further comprises a locking mechanism comprising a secondary scored line, two die cuts which intersect the said primary scored line and a third die cut which is parallel to said secondary scored line, said locking mechanism being pressed downward to form a die cut finger, wherein said finger is used to keep said support leg in a secure position.