Abstract: A siding tool for siding installation in building construction to efficiently measure the distance between adjacent siding panels and to install siding. The body of the siding tool is preferably approximately 3/16? ( 3/16 inches) wide, and a depth of approximately two inches (2?). The width and depth are used to measure distances according to building code. The body has a lip at one end that extends from the base of the body. The lip is configured to position the siding tool in place by catching the bottom edge of a panel of siding that has been placed. The lip of the siding tool is also configured for a user to position the siding tool upside down and use the lip to draw measurement lines.