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 the total number of matches played (i.e. wins plus draws plus losses). A draw counts as a ^{1}⁄_{2} win.
For example, if a team's season record is 30 wins and 20 losses, the winning percentage would be 60% or 0.600. If a team's season record is 30–15–5 (i.e. it has won thirty games, lost fifteen and tied five times), the five tie games are counted as 2^{1}⁄_{2} wins, and so the team has an adjusted record of 32^{1}⁄_{2} wins, resulting in a 65% or .650 winning percentage for the fifty total games from
In North America, winning percentages are expressed as decimal values to three decimal places. It is the same value, but without the last step of multiplying by 100% in the formula above. Furthermore, they are usually read aloud as if they were whole numbers (e.g. 1.000, "a thousand" or 0.500, "five hundred"). In this case, the name "winning percentage" is actually a misnomer, since it is not expressed as a percentage. A winning percentage such as .536 ("five thirtysix") expressed as a percentage would be 53.6%.
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. In baseball, a pitcher is assessed wins and losses as an individual statistic and thus has his own winning percentage, based on his win–loss record.
However, in association football, a manager's abilities may be measured by win percentage. In this case, the formula is wins divided by total number of matches; draws are not considered as "halfwins", and the quotient is always in percentage form.
In the National Football League, division winners and playoff qualifiers are technically determined by winning percentage and not by number of wins. Ties are currently counted as half a win and half a loss, however, prior to 1972 tied games were disregarded for the purposes of this calculation — a 1022 record (10÷12 ≈ 0.833) would then have outranked an 113 record (11÷14 ≈ 0.785). Tie games, a fairly common occurrence in football before the introduction of overtime, were thus somewhat more valuable to teams with a winning record, as compared with current rules.
Some leagues and competitions may instead use a points percentage system, changing the nature of this statistic. In this type of method, used in many group tournament ranking systems, the competitors are awarded a certain number of points per win, fewer points per tie, and none for a loss. The teams are then ranked by the total number of these accumulated points. One such method is the "three points for a win", where three points are awarded for winning a game, one point is awarded for a draw, and no points are awarded for a loss. The National Hockey League (which uses an overtime and shootouts to break all ties) awards two points for a win in regulation or overtime/shootout, one point for an overtime loss, and none for a regulation loss.^{[1]}^{[2]}
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Transcription
Contents
Statistics
Major League Baseball
Win %  Wins  Losses  Year  Team  Comment 

.798  67  17  1882  Chicago White Stockings  best premodern season 
.763  116  36  1906  Chicago Cubs  best 154game NL season 
.721  111  43  1954  Cleveland Indians  best 154game AL season 
.716  116  46  2001  Seattle Mariners  best 162game AL season 
.667  108  54  1975  Cincinnati Reds  best 162game NL season 
.250  40  120  1962  New York Mets  worst 162game NL season (2 games rained out) 
.265  43  119  2003  Detroit Tigers  worst 162game AL season 
.248  38  115  1935  Boston Braves  worst 154game NL season 
.235  36  117  1916  Philadelphia Athletics  worst 154game AL season 
.130  20  134  1899  Cleveland Spiders  worst season ever 
National Basketball Association
Win %  Wins  Losses  Season  Team  Comment 

.890  73  9  2015–16  Golden State Warriors  best 82 game season 
.110  9  73  1972–73  Philadelphia 76ers  worst 82game season 
.106  7  59  2011–12  Charlotte Bobcats  worst season statistically 
National Hockey League
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. It can be calculated as follows:
Points %  Wins  Losses  Ties  Points  Season  Team  Comments 

.825  60  8  12  132  1976–77  Montreal Canadiens  best points % in postexpansion NHL 
.131  8  67  5  21  1974–75  Washington Capitals  worst points % in postexpansion NHL 
See also
References
 ^ "Career Leaders and Records for Points Percentage (Goalie)". HockeyReference.com. Retrieved 24 May 2009.
 ^ "2008–2009 – REGULAR SEASON – SUMMARY – POINT PERCENTAGE". NHL.com. Retrieved 24 May 2009.