Winning percentage

In sports, a winning percentage is the fraction of games or matches a team or individual has won. It is defined as wins divided by wins plus losses (i.e. — the total number of matches). Ties count as a ½ loss and a ½ win. Winning percentage is one way to compare the record of two teams; however, another standard method most frequently used in baseball and professional basketball standings is games behind.

For example, if a team's season record is 28–16–5, the team has participated in 49 matches. The five ties represent 2½ wins and 2½ losses, and so the team has an adjusted record of 30½ wins and 18½ losses, resulting in a .620 winning percentage.

In baseball, pitchers are assessed wins and losses as an individual statistic and thus have their own winning percentage, based on their win–loss record. A pitcher's winning percentage is commonly expressed to three digits.

The name "winning percentage" is actually a misnomer, since a winning percentage, such as .536, is commonly not expressed as a percentage. The same value expressed as a percentage would be 53.6%. In leagues in which points are awarded for ties and overtime losses, it's possible for a team to have a winning percentage above 0.500 (50%) despite losing more than half of the games it has played.

National Hockey League
In ice hockey, standings are determined by points, not wins, changing the nature of this statistic. In the National Hockey League, teams are awarded two points for a win, and one point for either a tie (a discontinued statistic) or an overtime loss. Since this calculation is not based solely on wins, the statistic is called points percentage. It can be calculated as follows:


 * $$\mathrm{Points}\ \mathrm{percentage} = \frac{\mathrm{Points}}{\mathrm{Total \ possible \ points}}

= \frac{ \mathrm{(Ties + Overtime \ Losses) + (2 \times Wins)}}{\mathrm{ 2 \times Games \ Played }}$$