Abstract: A convertible lift mechanism for moving an object from a lower surface to a vertically displaced upper surface includes a number of retractable stairs. Each of the number of retractable stairs includes a stepping surface and is horizontally movable between a position received into an opening defined in a vertical wall between the upper and lower surfaces, and a position extending out of the opening. The convertible lift mechanism also includes a lift platform which is movable between a lowered position and a raised position. The convertible lift mechanism also includes a number of vertical screw drive mechanisms each including a driven lift nut that is secured to the lift platform. Actuation of the number of vertical screw drive mechanisms causes movement of the lift platform between the lowered position and the raised position. A method of operating a convertible lift mechanism is also disclosed.