A printing apparatus connectable to an external power supply having a plurality of outputtable electric power information, including: a printing head performing printing by electric power supplied from the external power supply; and a controller configured to: obtain the plurality of electric power information; determine whether the printing can be performed if electric power indicated by the obtained electric power information is supplied from the external power supply; decide, as request electric power information, any one of the electric power information indicating possible electric powers; request the external power supply to output electric power indicated by the request electric power information; calculate a print control value for controlling the printing head based on the decided request electric power information; and control the printing head to perform the printing based on the calculated print control value.