A portable stand-up desk kit for use on a supporting surface to form a stand-up desk with the supporting surface, the portable stand-up desk kit including a first surface rotatably connected to a second surface about a surface hinging means, the first and second surfaces being parallel and spaced apart to define an interior portion therebetween in a closed position, and the first and second surfaces being substantially co-planar when rotated to an open position about the surface hinging means to form a first working surface for the stand-up desk, wherein the interior portion includes one or more first support means configured to be connected to an underside of the first and second surfaces at one end of the first support means and to engage the supporting surface at the other end when in the open position so as to elevate the first working surface of the stand-up desk from the supporting surface.