Modular circular saw

A modular circular saw, comprising:

• a base;
• a worktable rotatably supported on the base, the worktable defining a work surface;
• a cutting unit pivotally mounted at the worktable and movable up and down relative to the worktable;
• and
• a workpiece support unit comprising two support frames disposed at two opposite sides of the worktable, each support frame comprising a support rod having two ends and two opposing extension rods attached to each end of the support rod, the two extension rods each having respective ends thereof respectively pivotally connected to the base and respective opposite ends thereof pivotally connected to the two opposite ends of the support rod so that the workpiece support unit is movable relative to the worktable between an extended position where the support rods of the two support frames are disposed in a coplanar relationship with the work surface of the worktable and a folded position where the support rods of the two support frames are disposed above the worktable and kept apart from the work surface of the worktable at a predetermined distance.