FIP= [HR*13 + (BB+HBP-IBB)*3-K*2]/IP FIP stands for Fielding Independent Pitching, and was developed tangotiger. FIP is designed to remove some of the extraneous factors that factor into a pitcher’s ERA (the quality of the defensive players playing behind him, for example) and give a more accurate representation of the quality of a pitcher. The above […]


A save is rewarded to a relief pitcher if the following conditions are met (Rule 10.19): 1. He is the finishing pitcher in a game won by his team; 2. He is not the winning pitcher; 3. He is credited with at least ⅓ of an inning pitched; and 4. He satisfies one of the […]

[OBP / League OBP] + [SLG / League SLG] - 1

APRO was developed by Total Baseball as a way of comparing players across different years, parks and baseball eras. The stat is based on the ability to compare the stats of a player with those of his counterparts and judge if he excelled those averages.


A player is rewarded a Sacrifice Fly if a baserunner scores immediately proceeding his flyout.

SLG = [(1B) (2B x 2) (3B x 3) (HR x 4)]/AB

Slugging percentage tells you how often a player gets extra base hits. The maximum slugging percentage you can achieve is 4.000. Players who have homered in their first AB have reached this pinnacle, if only for a short time. A player with a SLG of over .500 is considered to be a power hitter.

TA = [(TB + HBP + BB + SB) - CS]/[(AB - H) + CS + GIDP] Total average was created in the 1970′s by Tim Boswell as a means of evaluating a player’s overall offensive performance. The stat favors players who get on base often and hit more extra base hits.

Games Finished (abbreviated as GF) is a stat given to a relief pitcher if he is the last pitcher for his team in a game. The stat only applies to relief pitchers; a starting pitcher throwing a complete game is not awarded a GF.

((H + BB) x TB) / (AB + BB)

Runs created is a statistic designed to figure out how many runs were the result of the action of a player.

Defensive Indifference is when a baserunner advances on the bases without contention from the defense.

SB% = Stolen Bases/(Stolen Bases + Caught Stealing) A player’s Stolen Base Percentage is the percentage he successfully steals a base, compared with the total number of attempts. A high Stolen Base Percentage is crucial for any player who wants to make his speed a useful tool to his team. A percentage above 66% is […]

An Inherited Runner is a baserunner who is on base when a pitcher enters the game. If these runners score during the new pitcher’s appearance, they do not count towards his ERA, but towards the pitcher who allowed them on base.

Win % = (Runs Score^2 / Runs Score^2 + Runs Allowed^2) = (1 / 1 + Runs Allowed/Runs Scored)^2) This formula was developed by Bill James as a way of estimating how many games a team should have won based on runs allowed and scored. The formula resembles the Pythagorean theorem, which is how it […]

A player is awarded a stolen base when he advances a base when the pitcher is delivering the ball to home plate. If there is no attempt by the defense to create an out on the play, there is no Stolen Base awarded and defensive indifference is called.

PA = AB + BB + HBP + SH + SF + Times Reached on Defensive Interference Each time a batter comes to the plate to bat, he is credited a Plate Appearance, regardless of the outcome. This stat differs from At Bats, which do not include certain possible outcomes,to prevent the decreasing of a […]

(1.8)OBP + SLG / 4 GPA was developed as a refinement of OPS, On-Base plus Slugging. GPA gives more weight to On-Base Percentage, as it has been dubbed more valuable by Sabermetricians. The number it produces also falls on a more familiar range to baseball fans, similar to the range for batting average.

Putouts + Assists) divided by (Putouts + Assists + Errors)

The fielding average, or fielding percentage, defensive statistic is the most common rating system being used in baseball today. It is meant to measure the success rate of fielding opportunities by each player. The official scorer for each game plays a role in this statistic by determining if the hit ball would have required an […]

Park Factor = ((homeRS + homeRA)/(homeG)) / ((roadRS + roadRA)/(roadG)) Park Factor is used to determine how hitter or pitcher friendly a ballpark is. The higher the number is above 1.000, the more hitter friendly it is, and the lower the number is past 1.000 is how pitcher friendly.

ERA+ = (League ERA) * (Home Park Factor) * 100 / (Player’s ERA) Adjusted ERA+, often simply abbreviated to ERA+ or ERA plus, is a pitching statistic in baseball. It adjusts a pitcher’s earned run average (ERA) according to the pitcher’s ballpark (in case the ballpark favors batters or pitchers) and the ERA of the […]


ISO = (2B + (3B*2) + (HR*3)) / AB Isolated Power (ISO) is a measure of a hitter’s raw power, in terms of extra bases per AB.

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