A circular saw conversion table device supports a circular saw in position for use as a table saw. The device includes a panel having a top surface, a bottom surface, and a perimeter edge extending around and between the top surface and the bottom surface. A slot extends through the panel. A track is coupled to the bottom surface of the panel. The track extends around the slot. The track defines a lip configured for receiving and supporting a deck of a circular saw such that the a blade of the circular saw extends through the slot and projects from the top surface of the panel. A stand is coupled to the panel and configured for supporting the panel on a surface.