The present disclosure relates to a handheld tool, a method of adjusting a shape of a handle body and an apparatus using the same. The handheld tool includes a tool head; a handle body connected to the tool head; a ranger configured to scan and measure a radius of rotation of the handle body, wherein the radius of rotation of the handle body indicates a minimum value of a maximum unobstructed length of the handle body in each radial direction of a rotation direction; and a controller connected to the handle body and the ranger and configured to: detect an operation instruction with regard to the tool, and in response to the operation instruction, control the ranger to measure the radius of rotation of the handle body and adjust a shape of the handle body based on the measured radius of rotation.