George Halas (right) of the Chicago Bears, who have recorded the most regular season wins.
The following is a listing of all 32 current National Football League (NFL) teams ranked by their regular season win–loss record percentage, accurate as of the end of the 2017 NFL regular season. For teams that previously played in the All-America Football Conference (AAFC), their AAFC win-loss records are not included as the NFL does not officially count AAFC statistics despite the 1950 NFL–AAFC merger.[a] However, for teams that played in the American Football League (AFL), their AFL win-loss records are included and officially counted by the NFL. Ties are registered as a half win and a half loss when calculating the win-loss record.
^For example, the Browns' regular season win–loss record does not include a 47–4–3 record compiled in the All-America Football Conference from 1946 to 1949, nor does their playoff record include the 5–0 record compiled during the same period. Likewise, the 49ers' AAFC regular season win–loss record of 38–14–2, nor their 1-1 AAFC playoff record are officially counted
^The Patriots played as the "Boston Patriots" from 1960–1970, before adopting the "New England Patriots" name, which they have played under since the 1971 season. The team was also briefly known as the "Bay State Patriots" prior to the 1971 season.
^The Colts played under the "Baltimore Colts" name from 1953–1983, before relocating to Indianapolis and adpoting their current "Indianapolis Colts" name, which they have played under since the 1984 season.
^The Chargers played as the "Los Angeles Chargers" in 1960 before relocating to San Diego in 1961 and adopting the "San Diego Chargers" as their name from 1961–2016. Before the 2017 season, the franchise relocated back to Los Angeles and has played under their initial "Los Angeles Chargers" name since.