Winning percentage

"Win–loss record" redirects here. For the baseball statistic, see Win–loss record (pitching).

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 losses). A draw counts 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 30 wins and 20 losses, the winning percentage would be .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 2½ wins and 2½ losses, and so the team has an adjusted record of 32½ wins and 17½ losses, resulting in a .650 winning percentage. In leagues in which points are awarded for overtime losses, it is possible for a team to have a winning percentage above .500 (50%) despite losing more than half of the games it has played.

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.

In North America, winning percentages are expressed to three digits and read as whole numbers (e.g. 1.000, "a thousand" or .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 thirty-six") expressed as a percentage would be 53.6%.

However, in soccer, 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 "half-wins", and the quotient is always in percentage form.

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.

Statistics

Major League Baseball

Win %	Wins	Losses	Year	Team	Comment
.798	67	17	1880	Chicago White Stockings	best pre-modern season
.763	116	36	1906	Chicago Orphans	best National League 154-game season
.721	111	43	1954	Cleveland Indians	best American League 154-game season
.716	116	46	2001	Seattle Mariners	best 162-game season
.250	40	120	1962	New York Mets	worst 162-game season (2 games rained out)
.265	43	119	2003	Detroit Tigers	worst 162-game season (no rainouts)
.248	38	115	1935	Boston Braves	worst modern National League season
.235	36	117	1916	Philadelphia Athletics	worst American League season
.130	20	134	1899	Cleveland Spiders	worst pre-modern season

National Basketball Association

Win %	Wins	Losses	Season	Team	Comment
.878	72	10	1995–96	Chicago Bulls	best 82-game season
.110	9	73	1972–73	Philadelphia 76ers	worst 82-game 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:

$\mathrm{Points}\ \mathrm{percentage} = \frac{\mathrm{Points}}{\mathrm{Total \ possible \ points}} = \frac{ \mathrm{Overtime \ Losses + (2 \times Wins)}}{\mathrm{ 2 \times Games \ Played }}$

Points %	Wins	Losses	Ties	Points	Season	Team	Comments
.825	60	8	12	132	1976–77	Montreal Canadiens	best points % in post-expansion NHL
.131	8	67	5	21	1974–75	Washington Capitals	worst points % in post-expansion NHL

Further information: List of NHL records (team)

See also

• Group tournament ranking system