Win Shares relates a player’s individual statistics to the number of wins he contributed to his team. We credit a team with three Win Shares for each win. If a team wins 100 games, the players on the team will be credited with 300 Win Shares—or 300 thirds-of-a-win. If a team wins 70 games, the players on the team will be credited with 210 Win Shares, and so on. The quality of the team does not affect an individual player’s Win Shares. A great player on a bad team will rate just as well as a great player on a good team. Win Shares also adjusts for offensive environment, so it is a great tool to use for looking at the greatest individual seasons in baseball history, as well as the greatest players of all time. For a complete description of how Win Shares are calculated as well as countless essays using Win Shares to analyze various facets of the game, check out Bill James’ book, "Win Shares".
A "Win Shares By Team" profile exists for every season from the current year back through 2002.