Here in the FanGraphs Library, we have many pages devoted to extremely detailed breakdowns of some of our most prominent statistics. You can find hundreds of words about Weighted On-Base Average (wOBA) or Batting Average on Balls in Play (BABIP) for instance, but sometimes you aren’t looking for hundreds of words. Sometimes you just want some very basic information.

With that in mind, we present this post which will serve as a complete directory for every single offensive statistic available at FanGraphs. This post is organized in accordance with our leaderboards, so if you see something in the “Advanced” tab of the leaderboard that you don’t recognize, come to this page and find the matching acronym in the “Advanced” section. You can also use “CTRL + F” in most browsers and type in the stat you’re looking to identify.

There are a few stray statistics located around the site that don’t show up on the leaderboards, so please let us know if you find something that needs to be added. In any of the cases in which we have a full post about the stat, you’ll find links to that page.

*****

Dashboard

G (Games Played): Number of games in which the player has appeared.

PA (Plate Appearances): Number of times the player has come to the plate.

HR (Home Runs): Number of home runs.

R (Runs Scored): Number of runs scored.

RBI (Runs Batted In): Number of times a run scores as a result of a batter’s plate appearance, not counting situations in which an error caused the run to score or the batter hit into a double play.

SB (Stolen Bases): Number of stolen bases.

BB% (Walk Percentage): Frequency with which the batter has walked, calculated as walks divided by plate appearances.

K% (Strikeout Percentage): Frequency with which the batter has struck out, calculated as strikeouts divided by plate appearances.

ISO (Isolated Power): Average number of extra bases per at bat, calculated several ways such as SLG minus AVG.

BABIP (Batting Average on Balls in Play): The rate at which the batter gets a hit when he puts the ball in play, calculated as (H-HR)/(AB-K-HR+SF).

AVG (Batting Average): Rate of hits per at bat, calculated as H/AB.

OBP (On Base Percentage): Rate at which the batter reaches base, calculated as (H+BB+HBP)/(AB+BB+HBP+SF).

SLG (Slugging Percentage): Average number of total bases per at bat, calculated as Total Bases/AB.

wOBA (Weighted On Base Average): Combines all the different aspects of hitting into one metric, weighting each of them in proportion to their actual run value. While batting average, on-base percentage, and slugging percentage fall short in accuracy and scope, wOBA measures and captures offensive value more accurately and comprehensively.

wRC+ (Weighted Runs Created Plus): The most comprehensive rate statistic used to measure hitting performance because it takes into account the varying weights of each offensive action (like wOBA) and then adjusts them for the park and league context in which they took place.

BsR (Base Running Runs Above Average): Number of runs above or below average a player has been worth on the bases, based on stolen bases, caught stealing, extra bases taken, outs on the bases, and avoiding double plays. It is the combination of wSB, UBR, and wGDP.

Off (Offensive Runs Above Average): Number of runs above or below average a player has been worth offensively, combining Batting Runs and BsR.

Def (Defensive Runs Above Average): Number of runs above or below average a player has been worth on defense, combining Fielding Runs (Total Zone before 2002, UZR after) and the positional adjustment.

WAR (Wins Above Replacement): A comprehensive statistic that estimates the number of wins a player has been worth to his team compared to a freely available player such as a minor league free agent. You can learn exactly how we calculated it here.

Standard:

G (Games Played): Number of games in which the player has appeared.

AB (At Bats): Number of trips to the plate in which the batter does not walk, get hit by a pitch, sacrifice (fly or bunt), or reach on interference.

PA (Plate Appearances): Number of times the player has come to the plate.

H (Hits): Number of hits.

1B (Singles): Number of singles.

2B (Doubles): Number of doubles.

3B (Triples): Number of triples.

HR (Home Runs): Number of home runs.

R (Runs Scored): Number of runs scored.

RBI (Runs Batted In): Number of times a run scores as a result of a batter’s plate appearance, not counting situations in which an error caused the run to score or the batter hit into a double play.

BB (Walks): Total number of walks (includes IBB).

IBB (Intentional Walks): Number of times the batter was intentionally walked.

SO (Strikeouts): Number of strikeouts.

HBP (Hit By Pitches): Number of times the batter reached after being hit by a pitch.

SF (Sacrifice Flies): Number of times a batter’s fly out allowed a runner to tag up and score.

SH (Sacrifice Bunts): Any bunt in which there was a runner on base and less than two outs in which the batter was put out and at least one runner advanced.

GDP (Grounded into Double Play): Number of times the batter hit into a double play.

SB (Stolen Bases): Number of stolen bases.

CS (Caught Stealing): Number of times caught stealing.

AVG (Batting Average): Rate of hits per at bat, calculated as H/AB.

Advanced:

PA (Plate Appearances): Number of times the player has come to the plate.

BB% (Walk Percentage): Frequency with which the batter has walked, calculated as walks divided by plate appearances.

K% (Strikeout Percentage): Frequency with which the batter has struck out, calculated as strikeouts divided by plate appearances.

BB/K (Walk to Strikeout Rate): Ratio of walks to strikeouts, calculated as Walks/Strikeouts.

AVG (Batting Average): Rate of hits per at bat, calculated as H/AB.

OBP (On Base Percentage): Rate at which the batter reaches base, calculated as (H+BB+HBP)/(AB+BB+HBP+SF).

SLG (Slugging Percentage): Average number of total bases per at bat, calculated as Total Bases/AB.

OPS (On Base Plus Slugging): Combination of OBP and SLG, calculated as OBP+SLG.

ISO (Isolated Power): Average number of extra bases per at bat, calculated several ways such as SLG minus AVG.

Spd (Speed Score): A slightly outdated statistic that attempts to measure a player’s running ability.

BABIP (Batting Average on Balls in Play): The rate at which the batter gets a hit when he puts the ball in play, calculated as (H-HR)/(AB-K-HR+SF).

UBR (Ultimate Base Running): The number of runs above or below average added by a player on all non-SB/CS base running players.

wGDP (Weighted Grounded Into Double Play Runs): The number of runs above or below average added by a player by staying out of double plays.

wSB (Weighted Stolen Base Runs Above Average): Number of runs above or below average added by a player on stolen base attempts.

wRC (Weighted Runs Created): Number of runs a player has generated for his team as a result of his wOBA and playing time.

wRAA (Weighted Runs Above Average): Number of runs above or below average a player has added as a hitter.

wOBA (Weighted On Base Average): Combines all the different aspects of hitting into one metric, weighting each of them in proportion to their actual run value. While batting average, on-base percentage, and slugging percentage fall short in accuracy and scope, wOBA measures and captures offensive value more accurately and comprehensively.

wRC+ (Weighted Runs Created Plus): The most comprehensive rate statistic used to measure hitting performance because it takes into account the varying weights of each offensive action (like wOBA) and then adjusts them for the park and league context in which they took place.

Batted Ball

BABIP (Batting Average on Balls in Play): The rate at which the batter gets a hit when he puts the ball in play, calculated as (H-HR)/(AB-K-HR+SF).

GB/FB (Ground Ball to Fly Ball Ratio): The ratio of ground balls a batter hits to fly balls, calculated as GB/FB.

LD% (Line Drive Percentage): The percentage of a batter’s balls in play that are line drives, calculated as LD/BIP.

GB% (Ground Ball Percentage): The percentage of a batter’s balls in play that are ground balls, calculated as GB/BIP.

FB% (Fly Ball Percentage): The percentage of a batter’s balls in play that are fly balls, calculated as FB/BIP.

IFFB% (Infield Fly Ball Percentage): Percentage of a batter’s fly balls that were infield fly balls, calculated as IFFB/FB.

HR/FB (Home Run to Fly Ball Rate): Percentage of a batter’s fly balls that go for home runs, calculated as HB/FB (even though some HR are line drives).

IFH (Infield Hits): Number of infield hits.

IFH% (Infield Hit Percentage): Percentage of ground balls that are infield hits, calculated as IFH/GB.

BUH (Bunt Hits): Number of bunt hits.

BUH% (Bunt Hit Percentage): Percentage of bunts that go for hits, calculated as Bunt Hits/Bunts.

Pull% (Pull Percentage): Percentage of batted balls hit to the pull field.

Cent% (Center Percentage): Percentage of batted balls hit to the middle of the field.

Oppo% (Opposite Field Percentage): Percentage of batted balls hit to the opposite field.

Soft% (Soft Contact Percentage): Percentage of soft-hit batted balls.

Med% (Medium Contact Percentage): Percentage of medium-hit batted balls.

Hard% (Hard Contact Percentage): Percentage of hard-hit batted balls.

Win Probability

WPA (Win Probability Added): The total impact a batter’s plate appearances (or SB/CS) have on his team’s win expectancy relative to league average.

-WPA (Negative Win Probability Added): The sum of a batter’s negative WPA events.

+WPA (Positive Win Probability Added): The sum of a batters positive WPA events.

RE24 (Run Expectancy 24 Base Out State): The total impact a batter’s plate appearances (or SB/CS) have on his team’s run expectancy relative to league average.

REW (Run Expectancy Wins): RE24 converted from runs to wins.

pLI (Average Leverage Index): The average leverage index of each batter’s plate appearances.

phLI (Average Leverage Index while Pinch Hitting): The average leverage index of each batter’s plate appearances while pinch hitting.

PH (Pinch Hits): Number of hits while serving as a pinch hitter.

WPA/LI (Situational Wins): A player’s WPA controlling for leverage index, calculated as the sum of each event’s WPA/LI, not total WPA/LI.

Clutch (Clutch Score): The difference between a player’s totalWPA/pLI and their WPA/LI defined above.

Pitch Type

This section refers to data from Baseball Info Solutions. Raw PITCHf/x data is found in the PITCHf/x section. The % numbers refer to percentage and the “v” numbers refer to average velocity.

FB% (Fastball Percentage)

FBv (Average Fastball Velocity)

SL% (Slider Percentage)

SLv (Average Slider Velocity)

CT% (Cutter Percentage)

CTv (Average Cutter Velocity)

CB% (Curveball Percentage)

CBv (Average Curveball Velocity)

CH% (Changeup Percentage)

CHv (Average Changeup Velocity)

SF% (Split-Finger Percentage)

SFv (Average Split-Finger Velocity)

KN% (Knuckleball Percentage)

KNv (Average Knuckleball Velocity)

XX% (Unidentified Pitch Percentage)

Pitch Value

This section refers to pitch data from Baseball Info Solutions and denotes the number of runs above average a batter was against a specific pitch type (or that type per 100 pitches). Learn more about them here.

wFB (Weighted Fastball Runs)

wSL (Weighted Slider Runs)

wCT (Weighted Cutter Runs)

wCH (Weighted Changeup Runs)

wSF (Weighted Split Finger Runs)

wKN (Weighted Knuckleball Runs)

wFB/C (Weighted Fastball Runs per 100 pitches)

wSL/C (Weighted Slider Runs per 100 pitches)

wCT/C (Weighted Cutter Runs per 100 pitches)

wCH/C (Weighted Changeup Runs per 100 pitches)

wSF/C (Weighted Split Finger per 100 pitches)

wKN/C (Weighted Knuckleball Runs per 100 pitches)

Plate Discipline

These statistics are based on data from Baseball Info Solutions. Learn more about them here.

O-Swing% (Outside the Zone Swing Percentage): Swings at pitches outside the zone divided by pitches outside the zone.

Z-Swing% (Inside the Zone Swing Percentage): Swings at pitches inside the zone divided by pitches inside the zone.

Swing% (Swing Percentage): Swings divided by total pitches.

O-Contact% (Outside the Zone Contact Percentage): Contact made outside the zone divided by swings outside the zone.

Z-Contact% (Inside the Zone Contact Percentage): Contact made inside the zone divided by swings inside the zone.

Contact% (Contact Percentage): Contact made divided by swings.

Zone% (Zone Percentage): Pitches inside the zone divided by total pitches.

F-Strike% (First Pitch Strike Percentage): Percentage of PA that begin with a strike.

SwStr% (Swinging Strike Percentage): Swinging strikes divided by total pitches.

Value

To learn more about each of these statistics, visit our page on position player WAR.

Batting (Batting Runs Above Average): Number of runs above or below average added as a hitter.

Base Running (Base Running Runs Above Average): Number of runs above or below average added as a base runner.

Fielding (Fielding Runs Above Average): Number of runs above or below average added as a fielder.

Positional (Positional Runs Above Average): The number of runs above or below average allocated based on the number of innings at player at specific positions.

Offense (Offensive Runs Above Average): Number of runs above or below average added on offense (Batting + Base Running)

Defense (Defensive Runs Above Average): Number of runs above or below average added on defense (Fielding + Positional)

League (League Adjustment): An adjustment made per PA to make sure each league has exactly 0 runs above average.

Replacement (Replacement Runs): Number of runs an average player is worth compared to a freely available player, given their PA.

RAR (Runs Above Replacement): Sum of Off+Def+League+Replacement.

WAR (Wins Above Replacement): A comprehensive statistic that estimates the number of wins a player has been worth to his team compared to a freely available player such as a minor league free agent. You can learn exactly how we calculated it here.

Dollars (Dollar Value of Performance): The amount of money a player’s production would be worth on the free agent market in millions of dollars. This column uses $5.5MM/WAR, but that is a calculation from several years ago. The current number is between $6 million and $7 million.

PITCHf/x Pitch Type

The following represent pitch type percentages according to PITCHf/x data. The name of the pitch is next to each.

FA% (Four Seam and Unclassified Fastballs)

FT% (Two Seam Fastballs)

FC% (Cutters)

FS% (Split Fingers)

FO% (Forkballs)

SI% (Sinkers)

SL% (Sliders)

CU% (Cuvreballs)

KC% (Knuckle-Curves)

EP% (Ephesuses)

CH% (Changeups)

SC% (Screwballs)

KN% (Knuckleballs)

UN% (Unknowns)

PITCHf/x Velocity

The following are the average velocities according to PITCHf/x data. The name of the pitch is next to each.

vFA (Four Seam and Unclassified Fastballs)

vFT (Two Seam Fastballs)

vFC (Cutters)

vFS (Split Fingers)

vFO (Forkballs)

vSI (Sinkers)

vSL (Sliders)

vCU (Cuvreballs)

vKC (Knuckle-Curves)

vEP (Ephesuses)

vCH (Changeups)

vSC (Screwballs)

vKN (Knuckleballs)

vUN (Unknowns)

PITCHf/x H-Movement

The following are the average horizontal movements of the pitches according to PITCHf/x. The name of the pitch is next to each. (Negative values move toward RHH, positive values move toward LHH)

FA-X (Four Seam and Unclassified Fastballs)

FT-X (Two Seam Fastballs)

FC-X (Cutters)

FS-X (Split Fingers)

FO-X (Forkballs)

SI-X (Sinkers)

SL-X (Sliders)

CU-X (Cuvreballs)

KC-X (Knuckle-Curves)

EP-X (Ephesuses)

CH-X (Changeups)

SC-X (Screwballs)

KN-X (Knuckleballs)

UN-X (Unknowns)

PITCHf/x V-Movement

The following are the average vertical movements of the pitches according to PITCHf/x. The name of the pitch is next to each. (Numbers are relative to a pitch with no spin, meaning gravity’s effect is removed)

FA-Z (Four Seam and Unclassified Fastballs)

FT-Z (Two Seam Fastballs)

FC-Z (Cutters)

FS-Z (Split Fingers)

FO-Z (Forkballs)

SI-Z (Sinkers)

SL-Z (Sliders)

CU-Z (Cuvreballs)

KC-Z (Knuckle-Curves)

EP-Z (Ephesuses)

CH-Z (Changeups)

SC-Z (Screwballs)

KN-Z (Knuckleballs)

UN-Z (Unknowns)

PITCHf/x Pitch Type Value

The following are runs above average against each pitch using PITCHf/x data. The name of the pitch is next to each. Learn about pitch values here.

wFA (Four Seam and Unclassified Fastballs)

wFT (Two Seam Fastballs)

wFC (Cutters)

wFS (Split Fingers)

wFO (Forkballs)

wSI (Sinkers)

wSL (Sliders)

wCU (Cuvreballs)

wKC (Knuckle-Curves)

wEP (Ephesuses)

wCH (Changeups)

wSC (Screwballs)

wKN (Knuckleballs)

wUN (Unknowns)

PITCHf/x Pitch Value/100

The following are runs above average against each pitch per 100 pitches using PITCHf/x data. The name of the pitch is next to each. Learn about pitch values here.

wFA/C (Four Seam and Unclassified Fastballs)

wFT/C (Two Seam Fastballs)

wFC/C (Cutters)

wFS/C (Split Fingers)

wFO/C (Forkballs)

wSI/C (Sinkers)

wSL/C (Sliders)

wCU/C (Cuvreballs)

wKC/C (Knuckle-Curves)

wEP/C (Ephesuses)

wCH/C (Changeups)

wSC/C (Screwballs)

wKN/C (Knuckleballs)

wUN/C (Unknowns)

PITCHf/x Plate Discipline

The following are plate discipline numbers using PITCHf/x data. Learn about plate discipline numbers here.

PA (Plate Appearances): Number of times the player has come to the plate.

O-Swing% (Outside the Zone Swing Percentage): Swings at pitches outside the zone divided by pitches outside the zone.

Z-Swing% (Inside the Zone Swing Percentage): Swings at pitches inside the zone divided by pitches inside the zone.

Swing% (Swing Percentage): Swings divided by total pitches.

O-Contact% (Outside the Zone Contact Percentage): Contact made outside the zone divided by swings outside the zone.

Z-Contact% (Inside the Zone Contact Percentage): Contact made inside the zone divided by swings inside the zone.

Contact% (Contact Percentage): Contact made divided by swings.

Zone% (Zone Percentage): Pitches inside the zone divided by total pitches.

Pace (Average Time Between Pitches): Average time between pitches seen by a batter, based on PITCHf/x timestamps.