Implementations of a toilet installation guide and methods for installing a toilet. Implementations of toilet installation guides may include a shaft including a bolt receiving portion configured to receive a portion of a bolt and align a length of the shaft with a length of the bolt, a taper configured to be passed through the installation hole of the toilet while lowering the toilet toward the floor, and a visual aid configured to be seen through a toilet installation hole as an installer attempts to lower the toilet onto the floor over the bolt. In implementations the shaft may selectively couple to and decouple from the bolt with threads located on an inner wall of a cylindrical opening in the shaft. In implementations the toilet installation guide may be configured to be installed and uninstalled by hand, before and after lowering the toilet to the floor, respectively, to be reused.