The conversion, try (American football), also known as a point(s) after touchdown, PAT, extra point, two-point conversion, or convert (Canadian football) is a gridiron football play that occurs immediately after a touchdown. The scoring team attempts to score one extra point by kicking the ball through the uprights in the manner of a field goal, or two points by passing or running the ball into the end zone in the manner of a touchdown.

Attempts at a try or convert are scrimmage plays, with the ball initially placed at any point between the hash marks, at the option of the team making the attempt. The yard line that attempts are made from depends on the league and the type of try or convert being attempted.

If the try or convert is scored by kicking the ball through the uprights, the team gets an additional one point for their touchdown, bringing their total for that score from six points to seven. If two points are needed or desired, a two-point conversion may be attempted by running or passing from scrimmage. A successful touchdown conversion from scrimmage brings the score's total to eight.

Whether a team goes for one or two points, most rules regarding scrimmage downs, including scoring touchdowns and field goals, apply as if it were a normal American fourth-down or Canadian third-down play. Exceptions, including cases where the defense forces a turnover during a conversion attempt, vary between leagues and levels of play. One thing that sets the try apart from other plays in the NFL is that, apart from the actual points, ordinary statistics are not recorded on the try as they would be on a regular scrimmage play. For example, on December 4, 2016, Eric Berry of the Kansas City Chiefs made an interception on a try and physically returned it 99 yards for a defensive two-point conversion. However, because it occurred on a try, Berry did not get statistical credit for the 99 yards of return yardage or the interception, but did get credited for scoring 2 points. Likewise, a player will never be credited with passing, rushing, or receiving yardage on a try.

A term popularized by sports writer Mitch Goldich is octopus, in which a player scores the touchdown and the immediately following conversion. The term has gained steam in betting circles as a proposition bet. A notable octopus is one scored by Jalen Hurts to tie Super Bowl LVII with 5:20 left in the game.

The try/convert is among the oldest parts of the game of gridiron football and dates to its rugby roots. In its earliest days, scoring a touchdown was not the primary objective but a means of getting a free kick at the goal (which is why the name "try", more commonly associated with rugby today, is still used in American football rule books), and thus early scoring rubrics for the game gave more points to the subsequent kick than the actual advancement of the ball over the goal line. The related term "conversion" is still used in both rugby union and rugby league to refer to extra points scored by kicking the ball through the posts after a try has been scored.

By the start of the 20th century, touchdowns had become more important and the roles of touchdown and kick were reversed. By this time the point value for the after-touchdown kick had been reduced to its current one-point value while the touchdown was now worth five. (This later increased to six points in American football in 1912 and in Canadian football in 1956.)

In the first half of the 20th century, a one-point conversion could be scored either by kick or by way of a scrimmage play. Beginning in 1958, the scrimmage play conversion method of scoring became worth two points (a two-point conversion) in college football. While the American Football League adopted the college rule throughout its ten-season existence in the 1960s (as did the original United States Football League throughout its three-season existence in the 1980s), other professional leagues were slow to follow suit; all levels of Canadian football did so in 1975, and the National Football League did not do so until 1994.