
The Tampa Bay Buccaneers maintain the lowest regular season win–loss percentage (.402), holding a 291–433–1 record, through 2021. The league's other still-active charter member, the Arizona Cardinals, have recorded the most regular season losses (777), through the end of the 2021 season. Their NFC North divisional rival Green Bay Packers hold the highest regular season win–loss percentage (.572), with a 782–581–38 record through the end of the 2021 season. One of only two charter members of the NFL still in existence, the Chicago Bears have played the most games (1,435) and recorded both the most wins (783) and ties (42) in NFL regular season history, as of the end of the 2021 NFL season. Ties are registered as a half-win and a half-loss when calculating the win–loss percentage. Games in the NFL can either end with a winner and a loser, or the two teams can tie. Since its formation in 1920, as the American Professional Football Association (APFA), NFL game results have been recorded. These teams are divided equally between the National Football Conference (NFC) and the American Football Conference (AFC), and both conferences contain four divisions with four teams each. The National Football League (NFL) is a professional American football league, which as of the end of its 2021 season, consists of 32 teams.
