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Baseball-Reference Wins Above Replacement (bWAR)


Baseball-Reference's version of WAR (bWAR) is explained in detail here. The only difference is that the positional adjustment IS NOT INCLUDED in Offensive and Fielding WAR on this site. This can be changed by using the "customized metric" option when selecting metrics in the top right portion of your screen.

Offensive WAG (Wins Above Greatness) Formula

oWAR = Offensive Wins Above Replacement
PA = Player's plate appearances

Offensive WAG = oWAR - (PA / 600) * 3

Pitching WAG (Wins Above Greatness) Formula

pWAR = Pitching Wins Above Replacement
IP = Player's innings pitched

Pitching WAG = pWAR - (IP / 525) * 2.5

Per 162 Games

The rate of a statistic over the course of 162 games. This is based on the player's entire career. Position players and pitchers games played are treated differently.

Batting Seasons = Games appeared as a position player divided by 162. (G / 162)
Pitching Seasons = Games appeared as a pitcher plus Games Started, divided by 68. ((G + GS) / 68)
Seasons = Batting Seasons + Pitching Seasons
Total = Career Total in that statistic

per 162 = Total / Seasons


Developed by Jay Jaffe in 2004 at Baseball Prospectus. It is meant to gauge a player's Hall of Fame credentials by comparing them to Hall of Famers at the same position. JAWS is the average of a player's career total Wins Above Replacement and the total of their seven best seasons (peak).

Since not all positions are represented equally in the Hall of Fame, JAWS requires a minimum # of players at each position. Currently, the position with the most players in the Hall of Fame is RF, with 25. To meet the required minimum, the calculation includes the average position player's JAWS score for each player that it is short of the minimum (Starting and Relief Pitchers are not subject to this minimum requirement).

For example, there are currently 15 catchers in the Hall of Fame, which is 10 players short of the minimum. The JAWS calculation will find the average of the 15 catchers AND 10 average Hall of Fame position players to determine the average Hall of Fame catcher's JAWS score.