The Pittsburgh Pirates have completed 132 seasons in Major League Baseball (MLB) since joining the National League (NL) in 1887. Through 2018, they have played 20,256 regular season games, winning 10,240 and losing 10,016, for a winning percentage of .506. The Pirates are also a combined total of 43—53 (.448) in post-season play. Prior to joining the National League in 1887 the franchise compiled a record of 236—296 (.444) in five seasons of the American Association.