Abstract: A rotary tool powered pencil sharpener. The sharpener includes a housing, a shaft, and sharpening apparatus. The shaft extends into the housing and is rotated by the rotary tool. In a first embodiment, the sharpening apparatus includes a bracket disposed in the housing and rotating with the shaft, a support extending in the bracket, and a blade extending along the support. In a second embodiment, the sharpening apparatus includes a ring gear attached in, and to, the housing, a tube disposed in the hauling, extending from the shaft, and receiving the pencil, a cutter rotating relative to the tube, and a planet gear attached to the cutter and engaging the ring gear. The cutter has blades extending spirally therealong and rotates as the planet gear rotates around the ring gear when the tube, via the shaft, is rotated by the rotary tool, and as a result thereof, sharpens the pencil.